Can you use an 883 head on a 1200 Sportster?
We use the 883 heads on all 1200 Sportsters 1) HVP-XL Your heads completely reworked, ready to bolt back on. We usually advise Sportster owners to use stock cams because they are quiet and run well.
Can a Harley 883 be bored out to 1200?
The absolute best bang for the buck is an 883 bored out to 1200 and sporting a set of ported heads. This conversion will yield more horsepower per dollar than anything else that can be done to any other Harley-Davidson. We use the same sized valves as used in the 1200 heads. A 1.715″ intake and a 1.480″ exhaust valve.
What are the cylinder heads on a 1986 evolution 883?
The cylinder heads you’ll find on 1986-1990 models are: 49.5cc chamber, 1.585″ diameter intake valves, 1.350″ diameter exhaust valves This design provided a squish band over the stock flat top piston, the only year that an Evolution 883 had a squish band. As a result the valves start out closer to the pistons and closer to each other.
Why does an 883 head make so much power?
With the port work done, these heads flow much more than a stock set of 1200 heads BUT that isn’t the only reason why they make so much power. A healthy boost in compression is gained by squeezing that 1200cc motor into the small 883 combustion chambers. We are able to get 10.5:1 with this combination.
What makes an 883 head better than a 1200?
883 heads have shallower chambers than their 1200 counterparts, and longer valves to match. This makes the valves start out closer to each other and closer to the pistons. As a result, in stock form 883 heads cannot accommodate as much overlap in the cams as 1200 heads.
Can you convert 883 heads to 1250 Pistons?
HAMMER Performance provides a kit to do either. Here are some things to consider: The 1250 kitcomes with new, premium quality cylinders with extra thick iron liners to support the larger bore size. The 1250 kit is available with the basic conversion pistons only, for use with stock 883 heads.
The absolute best bang for the buck is an 883 bored out to 1200 and sporting a set of ported heads. This conversion will yield more horsepower per dollar than anything else that can be done to any other Harley-Davidson. We use the same sized valves as used in the 1200 heads. A 1.715″ intake and a 1.480″ exhaust valve.
The cylinder heads you’ll find on 1986-1990 models are: 49.5cc chamber, 1.585″ diameter intake valves, 1.350″ diameter exhaust valves This design provided a squish band over the stock flat top piston, the only year that an Evolution 883 had a squish band. As a result the valves start out closer to the pistons and closer to each other.