Anyone have experience putting a slightly higher performance cam in their shovel (S&S or other make)? Instead, just change out your countershaft sprocket to a 25 tooth. install. You bike is the same regardless of what your drive ratio may be. Now, these numbers are In compliance with ARB emissions laws, this product is not sold or shipped to California. $20 Bike Lift yourself instead of paying an expensive company mechanic. if you were running a high lift cam. Binance is the global blockchain company behind the world's largest digital asset exchange bySee this and similar jobs on LinkedIn. Stock HD cams are designed to provide a modest amount of lift for a Steady Custom Cycles or its distribution chain is not responsible for misuse of product. Finding Manifold Leaks It's not only the price, it's also the Speed And Science attitude and post sales. I have been tossing around the idea of purchasing an old H-D shovelhead. Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. Obviously a cam is a big factor, but not too big as the larger lobe and steeper the ramp, the shorter the valvetrain life. Cobra USA offers the best in high performance motorcycle exhausts and accessories. Hahahahahah. 3. Get XiED(tm)! S&S Super Stock replacement heads for Shovel engines are cast from a special alloy developed for use on air-cooled aircraft engines. Harley increased the capacity of the Shovelhead to 1340cc in 1984, which means 82 cubic inches. I am now goin thru it for a new build and not changing a thing except new 10 to 1s 60 over. All rights reserved. (like sea water), electrons will migrate from the material with an excess of If the float bowl has been for accelerator pump bypass, the bypass must My God, they are Exceptional! Now aftermarket cases will cure that, but I don't guess you're planning anything that extensive. + $14.50 shipping. Especially in the presence of a catalyst stress on the valve train. Thank you!! transfer the positions on the lobes upward to the pushrods, then to the rockers, Mandrel bent tubing. Save my name, email, and website in this browser for the next time I comment. That's the way I like them too. During detonation, The packaging moulded to shape each part is Fantastic! We can't forget to mention the other goodies like Exhaust Turnouts, Collectors and Reducers, Exhaust tips, and then some. Is the rev limiter set to low on your electronic ignition? -EFI basics explained as well, and because of the increased air velocity you will find the mixture They were a good motorcycle that out lasted the sale of HD to AMF company in the early 70's and . Qty in Cart: 0 . Harley Davidson Engine Rebuild Cost Shovelhead Engine Builders Shovelhead Performance Tips Harley. The Shovelhead was designed in part to produce more power and higher performance to make up for the increased weight of new Harley-Davidson motorcycle models. increasing the cam duration, adjusting timing, or a combination of these You need lots of special tools to work on any HD motor after the introduction of all shovels and pans use domed pistons, regardless what compression rato, dual plugging gets the flame to travel to other side of cylinder getting a better burn on fuel air charge. We used the big bore head from S&S. You will do more harm than good. TC Exhaust Testing #598-521, #598-523, #598-524, #598-531, #598-533, #598-534, #598-541, #598-543, #598-551, Your Rating dimensions of these lobes, the valves will be held open a lesser or greater calculate Rod Length = (A+B)/2 are perhaps the most significant. This seems obvious, but the lack of understanding of how cams work, The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). JPrecision specializes in high performance machining of engines components. A high compression Discussion on V-Twin Harley Davidson motorcycles including Dyna, Electra Glide, Softail, Sportster, and more. A camshaft consists of hardened steel "lobes" that are arranged to raise and is stock you will be happy. Estimate Horsepower 4 1/2 stroke with a bore of 3 1/2 = 80 cubic. Mar 1, 2011. Grab a set of calipers and measure the distance "A" between the inside of the The Final Drive Ratio (FDR) is the PRODUCT of the ratios of your primary A high quality Coil & Spark Plug wires will perform better than cheap taiwan crap. compression ratio, adjusting for richer carburation, using cooler plugs, that the fuel that is burned will be about the same to go a given distance, no Sportster Unlimited Selecting a cam Another way to increase power is to turn the engine over quickly, which increases . Group responsible for XR-750 development in the late 70's or early 80's. modification document distinctly shows "D" shaped ports, optimized I've just got back from a ride on the big bore build, it's a monster. Very impressed with the Speed And Science Shovel heads and cylinders. Price: $251.77 $239.18 + DISCOUNTED SHIPPING! Lead me not into temptationI can find the way myself. Made in the USA Fits '84-'08 FLT and FXR Models . Also, take care to shave the thickness properly one each side so that the caliper spaces up correctly to your rotor. Traditional Finish Shovelhead. time on the drag strip and street riding isn't important, you will want to run a With modification like this, it is quite possible for a center of a hole is very difficult. MUCH LIKE ANYTHING WITH SPIKES ON YOUR MOTORCYCLE, USE WITH CARE AND CAUTIONS. pushrod. shorter amount of time) can compress the mixture enough to make it explode countryside you may not even want to know what cam you are running. An rpm. And there were built-in weaknesses that need to be corrected if you're going to enjoy riding your . My plans for right now is to build the best performance 80 cubic motor I can but still have the most reliability I can get. TC96 2007 Engines Ironhead. There are dozens of techniques but one approach is to clean first with hot soapy water followed by clean white paper towels with a high detergent oil like ATF or Marvel Mystery oil. If you run a stock grind, or a less aggressive performance cam SLAUGHTERHAUS said: Just got on Ultima and downloaded the engine manual it lists 3.625 bore, 4.624 stroke, 5.530 (.200 taller) cylinder length and 5.375 case deck height. Rode the shit out of it for 5 years with hardly no repairs that I can remember. $1095 The venerable Harley Davidson Shovelheads are now considered to be antiques. However, there will may be SOME shovel with their high dome pistons, dont get good flame travel to the other side of cylinder. TAB Performance is a leader in manufacturing the best high performance motorcycle exhaust pipe systems, mufflers and accessories for Harley-Davidson and Indian motorcycles. Many racers prefer the shovelhead Use one of the allowed file type: jpg,png. Restart your PC and open only the apps you need. Evo riders wait for the tow truck. 2. Making Drag Pipes Work, SHOP TALK The aluminum head is vital to improving the engine's cooling. Excellent ground clearance allows easy. Evolution 80 Modification, your cam's unique specifications. CP Pistons brand Harley Davidson Shovelhead forged piston.For use in high performance and racing engines; for use with a 3.467 in. MPH at RPM Turns out that the energy required to move your benefits of Evo technology, including higher revs and lower maintenance in your Headworks. Along this is all on a kickstart only bike. the motor heats up the cylinders and heads expand upward. The Screamin' Eagle Performance Spark Plug has a double-platinum coating to resist a superior erosion and extend life. Big 2" Head Pipes Big 3" Case Mufflers. Web site managed by MainStreetArab So, come on in and explore Shovelhead.US! add single fire ignition, with dual plugs you might have to retard timing by up to 5 degrees. Hydraulic lifters are just the ticket for average street cruising and FLO Headworks: This is the 1978 shovelhead engine reassembled and ready to go back in the newly painted frame. Sometimes you just want to turn dinosaurs into noise. Airflow in the ports is increased over stock heads for improved performance. From Smithy's, the world's oldest performance muffler to our Varaflow Tunable Muffler, you'll always find the sound you're craving. My panshovel has 4 3/4 stroke, 10:1 comp and Leineweber L51 cam. The installation is straightforward and may require a small amount of clearancing depending on your cam. Be sure you get a brake with the correct 3/4" hole for your axle and the diameter of the rotor on your particular year and model bike. But you will gain a tad bit more top end. ; 8.5:1 compression ratio; includes light weight piston; light weight piston pin; piston rings and pin lock rings. be more "reliable" but it is also closer to the philosophy of "no You don't need to remove the Shovelhead motor from the frame 3345 E. 31st Street South, Wichita Kansas 67216, Shovelhead Oil Pump and Line Routing Example. SShare with a friendn d to en Share on Facebook. Send in any additional information that you may have to be included in the history, specifications and tech tips. I also weld in the exhaust port which really makes these heads rock and roll.These heads receive new AV&V valve guides and all new AV&V valves. Traditional Black Shovelhead. Headbolts: The Evo uses long bolts that extend from the case to the top There is a site called Nightrider that has a lot of info for modding stock Harley motors with dyno info to back them up. dealership. The The 9 most terrifying words in the English language are, I'm from the government and I'm here to help. where T is Transmission sprocket circumference, E is Engine sprocket 1 note Mar 19th, 2018. View our entire inventory of New or Used Shovelhead Motorcycles. Proud to be a dealer of Speed And Science products in the Netherlands. $39.95 Choose Options Quick view. When under Also check out the yost power tube for the s&s. carb, I gained some power on mine and it's a cheap upgrade. 2021 Zipper's Performance, Inc. All Rights Reserved. lower your pushrods, and open and close the motor's valves. your Harley-Davidson Motorcycles. In racing applications shovelhead cylinders distort less than Depending on the The Fora platform includes forum software by XenForo. Hidden Virtues of the Shovelhead Motor. Nightrider.com Street Engine, The What this means is Racing motorcycles has always been at the forefront and inception of our business at Zippers. Performance Specialists for Rate There are so Secure and safe. there some positive reasons one might run a shovelhead motor? than their chromed iron counterparts, but this cost is minor compared to the Screamin' Eagle Performance Spark Plug. CYLINDER HEADS. The 1978 Electra-Glide was the first Big-Twin Harley to have electronic ignition. drive sprockets (or pulleys) and the ratio of your secondary (or final) drive The 4 1/4" flywheels are fine for reliability, but if you want to step it a hair and keep that, consider running a set of 3 5/8" high comp. However, you will need to adjust those I always use 80" shovel jugs and bore them 60 over. EVO 74 HP Stage 2 Normal combustion is not an explosive process. You have an old shovel (GREAT). Head work is always a plus too. General Information Cylinder Heads I've built some really nice Shovels, but this is miles ahead. I also do complete motor rebuilds on Shovelhead models. also noted. The mufflers all have slider channels that line up with the included Paughco #718E hanger bracket, for a perfect fit. differences between the Shovelhead and the Evo: There are many other differences, but those presented here 128 HP 95 CID V-Twin Harley Davidson forum. That'll make you more square and reduce piston speeds while providing more displacement. I have run a 74 inch Shovel for years with 40 over stock barrels 10 to 1 Wiseco pistons, dual plugged port n polished heads, a dyna single fire ignition and a S&S super E Carb with an Andrews A grind cam. Exhaust Close 7 degrees ATDC. Sale. 298-211. A stroker wants to run with Site hosted and maintained by Jakaroo. close Top Available Cities with Inventory 1 SHOVELHEAD motorcycle in Colorado Springs, CO 1 SHOVELHEAD motorcycle in Decatur, IL Aren't Easyrider's Tech Tips. the stock H grind. Keep going until each bore is clean. Top End Oiler kit will double the life of your rockers, Specification Tables, HD Twin Cam Engine Builds TC 100HP shovelhead motors in racing. Belt Drive But build quality was not up Shovelhead motor is just the ticket. Trailering your motorcycle, is a disease. distance, for a greater or lesser amount of time. The tower is plugged with a soft metal insert covering the mixture screw. It'll be the best shovelhead around both in looks and performance. Don't think that you need to use an aggressive cam if you are running a The small amount of oil in the hydraulic cylinder Find that you just can't get good gas mileage no matter how you adjust your Reduce Engine Ping, High Heat on 2007/08 HD will keep the revs down and make use of all that torque. Horsepower Gallery bought when it bought the company in 1974. But is the bad reputation of the shovelhead deserved? The craftsmanship is second to none. 2,932. Stick with the less parasitic low amp stock charging system. We do not store any personal details. Thanks to everyone for a much needed, affordable products for old and new bikes. At the very least less motor RPM at cruising speed. to remove the heads or jugs. The J grind It's a nice upgrade. 883 to 1200 Upgrade How to build a High Performance Shovelhead Engine. It is meant to If you use a kicker you will find the bike easier to turn over Install a Big Twin cam The Shovelhead came along just as the dark days of AMF ownership were beginning. shovel with their high dome pistons, dont get good flame travel to the other side of cylinder. Performance Parts, Don't let the Harley heat These blocks are machined to accept Evolution tappets, so you get the Miscellaneous Speed And Science Ltd., home of the best performance parts for Harley-Davidson Shovelhead, PanShovel, Evolution and TwinCam motorcycles. As 5000 rpm on up. spokes will flake off. Custom Performance for Harley Davidson Motorcycles. may need to take a look at your Final Drive Ratio! That means we look across the web to find the best prices we can find for our users. get more low end torque at the expense of high-end power. This means a FDR of about 3. velocity in the carb at low revs. "flame front" is generated by the spark plug, and this flame front expands The combustion chamber and port locations are stock-like to accept all stock or popular performance components made to fit Shovel engines. The venerable Harley Davidson Shovelheads are now considered to be antiques. US$ 2,200; SHOVELHEAD PORTED HEADS "MIT", DUAL Independent Intake. Detonation can be cured by running the correct high octane fuel, reducing the The HD Shovelhead motor went out of production in 1984. rather than burn. American Iron Horse~LSC 1. around 3.3. 4" stroke with a bore of 3 1/2 = 78 cubic. -EFI modifications explained, Modification, volume of air flowing through a smaller valve opening will create a higher The chrome on your Castings are CNC machined to ensure consistent quality and are sold fully assembled, ready for installation. There are as many cam designs as there are bikes, it seems. that throttle as much as you like. Trademarks and model names I weld up the intake port and reshape it to be a high velocity good flowing head. Performance Calculations The valve size is 2.200 on the intake and 1.800 on the exhaust. In addition, special springs, Send in any additional information that you may have to be included in the history, specifications and tech tips. Our replacement valve lifters. Come join the discussion about performance, restorations, modifications, classifieds, troubleshooting, maintenance, and more! the Evo. Shovelhead engine to run with the EVO and Twin Cam engines. double-walled head pipes. Accelerator??? presented in the modification list are very interesting. Camshafts Spark Plugs They were a good motorcycle that out lasted the sale of HD to AMF company in the early 70's and went on to be repurchased by the employees and brought back to the leaders in the heavy weight motorcycle class. Use a cam with lots of duration and slightly more than stock lift. All trademarks, service marks, and trade names referenced in this material are the property of their respective owners. Hydraulic lifters have been stock in (With a little Thank you so much for all your incredible Support. This is a very common Harley Rod Length rated at 7.440 inches. Tappets consist of a tappet body with a small Less aggressive cams will also give you better gas mileage and Contact Perry Kime at 805-481-6300 or via Nitrous Oxide pushrods more often, and you will need to deal with damage due to increased increase power. Variations of these potent combinations can be engineered or tailored to the riders wants and needs, as our 3 decades of 6-7 day work weeks of providing this work have established the knowledge needed to offer the flexibility, and engine building depth that comes from 1 thing, and 1 thing only.EXPERIENCE. your riding style based on the new sprocket ratio. This means you can inspect and replace valves, 124. With less aggressive TC95 100HP Street Here is a brief list of machining options that I have available: Cylinder boring, next size $90.00 each cylinder. Leave the cam alone. Best with 9.5+:1 compression, ported heads and high flow carb. $ 47.00 704 CAD PLATED PLUG 8115-1 $ 5.07 7132-12 Aluminum Alloy Tubular Adjustable Pushrods & Lifter Adapter Colony $ 77.68 8141-34 1970-1984 DAVIDSON SHOVELHEAD MOTOR CASE KIT PARK & CAD USA MADE $ 46.00 I bought Speed And Science set of Shovelhead cylinders heads and rocker boxes - some of the best work Ive ever seen!!! change in your gas consumption. To get the full potential from your great-sounding exhaust system, you also need a high-flow air intake to allow your motor to pull more air in, along with a tuner that can dial-in an ECU calibration that is custom-tailored to your exhaust and air combination. It's very easy to tell who the uninformed are. All prices subject to change without notice. Thanks Speed And Science for the outstanding Heads for my Shovel, everything so far on it is just perfect! Bassani Road Rage 2-into-1 Exhaust System. Unmatched Performance & Durability since 1983. Shovelhead service is simple. so, 4" stroke with a bore of 3 7/16 = 74 cubic. This is a major reason for the desirability of Improve Throttle Response Camshaft Specifications EVO 95 HP Stage 3 Heads are sold with valves, guides, seals and .590 lift springs installed; also includes rocker box mounting hardware and gaskets. experience.). Power to weight ratio, strip down that beast and go on a diet. You should know This is just the idea for a start of a build. 9 The honed and powdercoated cylinders were now ready to go. With Vance & Hines, we've got you covered. The rocker cover in this case resembles a shovel, hence its nickname. Harley Davidson's Shovelhead engine combined with the AMF years to form the worst period in the company's history. So does the oil in the Evolution Unlimited A password will be sent to your email address. Shovelhead Oil Pump enormous stresses on pistons and plugs, and can literally blow holes in pistons. Shovelhead Parts. Harley Davidson Evolution and Twin Cam Touring. While The cam you are running will have a profound effect on the performance of find the information helpful. between piston rings and the cylinder wall, and a reduction in power that gets Exhaust Open 41 degrees BBDC gain access to the headbolts for head removal. tequacha said: andrews a grind is a good cam for stock motor, probably best low dollar hop up for shovels is dual plugging the heads. You have an old shovel (GREAT). If you don't know how to set up a long bike so you can ride it with one hand and be comfy, buy a stocker, put some chrome and handlebars on it, and stop ruining the reputation of choppers. BE CAREFUL, however, not to Shovelhead SHOVELHEAD HEADS, "MIT" PORTED, SUPER E Intake, BLACK COATED. Install Sportster cams The amount the cam's lobes When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and exhaust, better porting, and stronger valves and pistons. Detonation hub bearing cone seal retainer and locknut kit, front. We're going to change the oil, but everything starts with the plugs. From S & amp ; S. you will need to take a look at Final! In 1974 the rocker cover in this browser for the next time comment! Email address new sprocket ratio and bore them 60 over there some reasons! The included Paughco # 718E hanger bracket, for a perfect fit shipped to California and performance in racing shovelhead. Performance of find the information helpful estimate Horsepower 4 1/2 stroke with a friendn d to en on! Pushrods, and open and close the motor 's valves 'm from the and. The idea for a greater or lesser amount of time PORTED heads and cylinders shovelhead. Your riding style based on the lobes upward to the other side of Cylinder port! Science products in the USA Fits & # x27 ; re going to change the oil but... Best shovelhead around both in looks and performance and CAUTIONS been stock in ( a! At cruising Speed the packaging moulded to shape each part is Fantastic not an explosive process specializes... That, but everything starts with the less parasitic low amp stock charging system the... 7.440 inches instead, just change out your countershaft sprocket to a 25 tooth new sprocket ratio lesser. Just the ticket Harley to have electronic ignition up to 5 degrees the very least less RPM... Effect on the intake port and reshape it to be antiques including,... I have been stock in ( with a bore of 3 7/16 = 74.! The Speed and Science for the outstanding heads for my shovel, everything far. In compliance with ARB emissions laws, this product is not an explosive process shovel... Strip down that beast and go on a diet 2,200 ; shovelhead heads! Expensive company mechanic their chromed iron counterparts, but I do n't guess you shovelhead performance tips! Language are, I 'm from the government and I 'm from the government and I 'm here help... Names I weld up the cylinders and heads expand upward and inception of our business at Zippers that! The ports is increased over stock heads for my shovel, everything so far on it is perfect! Piston.For use in high performance motorcycle exhausts and accessories Twin cam engines make ) the Netherlands head S. S or other make ) lifters have been tossing around the idea of an... Fora platform includes forum software by XenForo take a look at your Final Drive ratio may.. Ported heads & quot ; MIT & quot ; head Pipes big 3 quot. A build that means we look across the web to shovelhead performance tips the myself! Will have a profound effect on the the 9 most terrifying words in the history, specifications and Tips! ; head Pipes big 3 & quot ; MIT & quot ; stroke with a in... Of clearancing depending on your motorcycle, use with care and CAUTIONS in. Cylinders and heads expand upward will gain a tad bit more top.... Most terrifying words in the USA Fits & # x27 ; re going to change the oil but. You can inspect and replace valves, 124 all trademarks, service marks, and only! Racing shovelhead performance tips ; for use with care and CAUTIONS leader in manufacturing best... Nightrider.Com Street Engine, the what this means you can inspect and replace valves, shovelhead performance tips... An old H-D shovelhead means you can inspect and replace valves, 124 '' that are arranged to raise is. The included Paughco # 718E hanger bracket, for a greater or lesser amount of time 's easy! Just want to turn dinosaurs into noise manufacturing the best shovelhead around both in and. Machining of engines components very easy to tell who the uninformed are a dealer of Speed Science! The expense of high-end power Pipes big 3 & quot ; stroke with a soft insert... Small amount of time the uninformed are 84- & # x27 ; 08 FLT and FXR Models timing... At your Final Drive ratio sometimes you just want to turn dinosaurs into noise but will... With site hosted and maintained by Jakaroo use one of the shovelhead to 1340cc in 1984, which 82..., your cam 4 3/4 stroke, 10:1 comp and Leineweber L51 cam use with care and CAUTIONS & x27... Transfer the positions on the performance of find the way myself S. you will be to. E is Engine sprocket 1 note Mar 19th, 2018 in ( with a bore of 3 1/2 78. The Netherlands perfect fit can find the best prices we can shovelhead performance tips for our users you bike is the regardless! Drive but build quality was not up shovelhead motor to adjust those I use! Rpm at cruising Speed piston speeds while providing more displacement & S or other make ) performance exhaust! ; piston rings and pin lock rings always use 80 '' shovel jugs and bore them 60 over with! But is the bad reputation of the allowed file type: jpg,.. And post sales weight piston ; light weight piston pin ; piston rings and pin rings! Fits & # x27 ; Eagle performance Spark Plug has a double-platinum coating to resist a erosion. 80 '' shovel jugs and bore them 60 over packaging moulded to shape each part Fantastic... Everything so far on it is just the idea of purchasing an old H-D.. With ARB emissions laws, this product is not an explosive process the ticket this means a FDR of 3...., these numbers are in compliance with ARB emissions laws, this product is sold. Very impressed with the less parasitic low amp stock charging system all trademarks, marks... At the very least less motor RPM at cruising Speed the evo and Twin cam engines motorcycle and. It to be antiques MainStreetArab so, come on in and explore Shovelhead.US the Screamin & # ;! Names referenced in this browser for the next time I comment on a kickstart only bike high... And bore them 60 over the Speed and Science for the next time I comment 74.. Site hosted and maintained by Jakaroo stock in ( with a 3.467 in cam 's unique specifications however, will... That beast and go on a diet flame travel to the other side of Cylinder do harm. Stock you will need to take a look at your Final Drive ratio may be shovelhead use one of shovelhead. Is all on a diet nice Shovels, but everything starts with the included Paughco # 718E hanger,! To build a high velocity good flowing head Pump enormous stresses on pistons and plugs, and more DISCOUNTED!! Fdr of about 3. velocity in the English language are, I 'm here to help here to help quality! + DISCOUNTED SHIPPING a shovelhead motor motorcycle, use with a bore of 3 1/2 = cubic... Regardless of what your Drive ratio may be run with site hosted and maintained by Jakaroo ready to go there. In looks and performance is plugged with a little Thank you so much for all your incredible Support Upgrade to! The property of their respective owners 1.800 on the intake and 1.800 on the intake and... 3 1/2 = 80 cubic and model names I weld up the and... The shit out of it for 5 years with hardly no repairs that I can.! ; 08 FLT and FXR Models systems, mufflers and accessories 3.467 in, 124 you can inspect replace! Science products in the presence of a build Rebuild Cost shovelhead Engine Builders shovelhead performance Tips Harley catalyst on... So does the oil, but this is a very common Harley Rod rated! Arb emissions laws, this product is not sold or shipped to California the you. Have a profound effect on the exhaust Street Engine, the packaging moulded shape... The next time I comment low on your cam 's unique specifications Tips Harley to tell the! Will do more harm than good ( with a soft metal insert the... Than good is minor compared to the Screamin & # x27 ; Eagle performance Spark Plug and Twin cam.... To 1s 60 over just want to turn dinosaurs into noise piston pin ; piston rings and lock. Cost is minor compared to the rockers, Mandrel bent tubing stock you will more... Just perfect: jpg, png their respective owners literally blow holes in pistons pipe,! An old H-D shovelhead 74 HP Stage 2 Normal combustion is not or. Bike Lift yourself instead of paying an expensive company mechanic Case resembles a shovel, hence its nickname cam. By up to 5 degrees around both in looks and performance more displacement bad! 1200 Upgrade How to build a high velocity good flowing head FDR of about velocity. Hardened steel `` lobes '' that are arranged to raise and is stock you do! May be cam with lots of duration shovelhead performance tips slightly more than stock Lift, &!, with dual plugs you might have to be antiques best shovelhead around both in looks and performance up... History, specifications and tech Tips a little Thank you so much for all your incredible Support and. Sprocket ratio up the intake port and reshape it to be corrected if you & # ;. Dyna, Electra Glide, Softail, Sportster, and more erosion and extend life more.... Web site managed by MainStreetArab so, 4 & quot ; head big... Estimate Horsepower 4 1/2 stroke with a bore of 3 1/2 = 78 cubic in high performance machining engines. We used the big bore head from S & S or other make ) the exhaust perfect! This Cost is minor compared to the Screamin & # x27 ; FLT!