This robbed them of horsepower and torque. However, 2004-2006 heads can be fitted to 1991-2003 bikes without much trouble. For those who have a stock or mildly modified engine the answer is to move up to the next “stage”… or a Stage 1 upgrade kit to be more exact. We chose upgrading the chassis, suspension, and braking first over just simply adding gobs of horsepower. Harley won't even tell you the hp rating. 2007 FLSTF 117, GMR Stage IV Welded Heads S&S 4.125 Cyl, CP Pistons, 10:84 HQ-575, HPI 51mm(4.89 Inj) TTS Tuner, Rinehart Exhaust Renegade Wheels To Much Chrome to … There is a difference between torque and horsepower. This makes the valves start out closer to each other and closer to the pistons. ... and under much scrutiny of our editors we have listed a countdown to performance nirvana and in what order in which to do so. Contrary to what many performance shops try to tell you, we were able to break the 90 horsepower mark without larger valves, porting and polishing the Evolution heads. You can read more about the various details of XL cylinder heads in this tech article. Harley-Davidson FXSTC 1340 Softail Custom: Year: 1988: Category: Custom / cruiser: Rating: 3.5 See the detailed rating of design and look, maintenance cost, engine performance, etc. Top 10 Quick Harley-Davidson Performance Upgrades. I dyno'd my new '07 Ultra with the 96ci motor. Recently the oil is covering the right side of my bike, after long rides!! Although the Evolution 1340cc is no longer in production, the Sportster® model line of motorcycles receives Evolution engines with 883 cc and 1200 cc displacements (manufactured 1986 to … I have put about 4,000 miles since I got her, and for the first 3500 miles no problems. The 883cc Harley engine stock dyno tests out at 49HP and 58ft lbs of torque. Compare with any other bike. Displacement is 81.8 cubic inches (1,340 cc), and the engine produces 70 horsepower. unfortunately, with the new epa guidelines in place, Harley had to really lean the new 96ci motors down. The 750cc Harley engine stock dyno tests out at 45HP and 37ft lbs of torque. Torque is the twisting power that gets you going. In it's stock configuration, it produced 68 horsepower ( less than my TC88CI ). Before dragging out the catalogs and bolting on every gizmo claiming to make your ride go faster let’s start with the basics of a … Deciding which kind of power you want is the first step in increasing Harley performance. SAC Raging Bull is the country’s leading aftermarket vehicle tuners, but as you may or may not know, we have been actively involved in successfully and reliably extracting extra horsepower from Harley-Davidson motorcycles for the past few years.. Steve Fischer, our company’s founder and the man who started his engineering career on motorcycles more than three decades ago, … The 500cc Harley engine stock dyno tests out at 38HP and 32ft lbs of torque. 883 heads have shallower chambers than their 1200 counterparts, and longer valves to match. I have a 1998 FLHTC with a 1340 Evo Engine... My problem is oil blowing back out of the breather, best I can tell. We achieved 95.4 horsepower at the rear wheels using un-ported Harley-Davidson 1340 heads and increasing the compression with domed pistons. Type air-cooled, Twin Cam 88B Displacement 1540 cm3 Bore X Stroke 3.7x4.0 in OR 94 mm Compression Ratio 8.9:1 Horsepower / KW(hp)/RPM Torque 85/3000 lb-ft/RPM OR 115/3000 Nm/RPM Fuel System The best I can tell it is coming from the air filter area.. Horsepower is the spinning power that keeps you moving down the road. If you’re looking for an engine with more horsepower, try the V-rod, 1200cc engine. 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