Performance Cylinder Heads:
Our high performance cylinder heads are available for purchase outright, exchange, or we can modify your castings. Exchange heads must be in acceptable cosmetic condition. Expect the same from us. Previously modified heads are not eligible for exchange.
Stg-1 Twin-Cam $450.00
These heads are the perfect choice for your performance Big Bore application. First the valve seats inner diameter is enlarged & blended into the port to promote efficient breathing. Next, a competition valve job is performed on our Rottler equipment, all gasket surfaces are trued, Viton valve seals installed & new springs are packed for .550 lift. (Optional higher lift available upon request)
* Add $120 for compression releases machined and installed *
This head was purpose built for our Big-Bore engine kits!
Similar work is performed on Evo & Sportster heads as well.
Stg-2 Twin-Cam CNC $795.00
If big torque is what you want these heads are for you! After complete CNC reworking of both intake & exhaust ports new valve guides are installed & sized. Next, the valve seats are machined with our proprietary seat angles on Rottler equipment to accept 1.900/1.615 hi-flo valves. All gasket surfaces are trued, Viton valve seals installed & new performance springs are packed for .600 lift. (Your choice of std. or beehive/Optional higher lift available upon request) 249cfm Intake / 203cfm Exhaust, 28″ at .600 lift, SuperFlow 450 flow bench.
* Add $120 for compression releases machined and installed *
Designed for 95″ & up heavily modified engines!
Attention: Due to variations in stock cylinder head castings, all inside surfaces of ports may not be touched during the CNC machining process. (This is particularly noticed on ’06-up castings) This does not effect performance and is not considered a defect. Full hand finishing of ports is available for an additional $100.00
883 to 1200 conversion heads $495.00
Unlock the true potential of your 1200 conversion using this performance head. First the valve seats inner diameter is enlarged & blended into the port for a substantial increase in flow. Next, a competition valve job is performed on our Rottler equipment using oversized (1.720/1.480 ) Hi-flo valves. All gasket surfaces are trued, Viton valve seals installed and new spring are packed for .550 lift. (Optional higher lift available upon request)
* For use with reverse dome piston *
This head was purpose built for our Stg-1 1200 conversion!
Compression Releases $69.95
Manufactured from 303 stainless steel with billet aluminum cap for a custom appearance. Requires a 10mm x 1.0mm threaded hole for installation. Sold in pairs, made in the USA.
(a must for todays big inch, high compression engines!)
