SRE R+R "as cast"aluminium cylinderheads, GM LS3, 4-bolt, rectangular port.

SRE R+R (Road + Racing) cylinder heads are fully assembled, machined & tested in the Netherlands. We only use parts that we support for a 100% and we machine/assemble the cylinder heads, if desired, completely to your specifications!

As cast:
As cast, R+R cylinder heads are a real upgrade for your street/strip engine. For use with hydraulic roller camshafts. These "as cast" R+R cylinder heads deliver, just out of the box, excellent performance over a wide RPM range.

Specifications:

• Aluminum A356 casting.
• 6cc, heart shaped combustion chambers.
• 2.165" stainless steel, swirl polished, +.100" intake valve.
• 1.60" stainless steel, swirl polished, +.100" exhaust valve.
• 255cc rectangular intake runner.
• 82cc exhaust runner.
• 3- angle, ductile iron seats (Not suitable for LPG. Can be made LPG ready at an additional cost). 
• Valve springs (Howards or equivalent).
• Hardened chrome moly 10° retainers.
• Hardened 10° valve lock's. 
• Bronze valve guides for 8mm" valves.
• High-temp Viton valve seals.
• Bare or assembled to specifications.
• Sold as pair.