What kind of head does a Harley Big Twin use?
4 Valve Hemi Heads for Harley Big Twin Engines. Revolution Performance Motors has introduced the RPMHemi 4 valve heads for the Evo V-twin and early Twin Cam engines, Twin Cam EFI kits are currently being tested and will be available soon.
How big of a bore does a hemi head need?
The heads fit any bore size from 3.5 to 4.25 inches. The hemi combustion chamber and center location of the spark plug as well as less spark advance allow compression to increase from the stock 9:1 to over 11:1. Evo kits start at $2995, Twin Cam kits from $3099.
Is there a 4 valve hemi head for a Harley?
Our headsets and engines are also low in emissions. RPMHemi.com manufactures their patented 4 Valve Hemi Head Kits and sells complete 97”, 107” and 114” motors with or without our 4Valve Hemi Heads and we have our patented Ram Chamber for single and dual carburetor V-Twin applications.
Are there 4 valve heads for a twin cam engine?
Revolution Performance Motors has introduced the RPMHemi 4 valve heads for the Evo V-twin and early Twin Cam engines, Twin Cam EFI kits are currently being tested and will be available soon. If someone asks, “That thing got a hemi?” just install these heads and you can say yes. Sweet!
What’s the difference between 1200 and 1200 Hemi Pistons?
Alternatively, the chamber can be relieved and the heads used with flat-top pistons. These heads have one advantage over 1200 “hemi” open-chamber heads in that the 3″ diameter chamber provides a “squish band” around its perimeter when placed over the larger 1200 bore.
What are valve sizes on Motorhead Sportster 1200?
Valve sizes, at 1.715″ intake and 1.480″ exhaust, are identical to the ’88–’03 Sportster 1200 head, as are the ports. The only place this Buell head is different from the ’88–’03 Sportster head is in the chamber. Extra material was added, as well as a 10-degree squish band, to bring the volume down to about 62cc.
What kind of heads do Sportster engines use?
When it comes to the Sportster heads there are many options. We work on them all but when it comes to 1200cc engines (after boring out 883 cylinders) we prefer the stock 883 head castings best of all. When we finish with 883 OR 1200 heads they have the same sized valves. 1.715″ intakes and 1.480″ exhausts.
What’s the difference between Buell 1200 and 1200 Sportster heads?
The ’90–’02 Buell heads are all but identical to ’91–’03 1200 Sportster heads except ’95–’96 S2 models, which use a smaller 3/8″ fastener on one side and the standard 7/16″ fastener on the other.