SRE R+R "as cast"aluminium cylinderheads, big-block Chevrolet, 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. Available for use with hydraulic flat tapped or 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.
• 122cc, heart shaped combustion chambers.
• 2.25" stainless steel, swirl polished, +.250" intake valve.
• 1.88" stainless steel, swirl polished, +.100" exhaust valve.
• 335cc intake runner.
• 140cc 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 or titanium 10° retainers.
• Hardened 10° valve lock's. 
• Bronze valve guides for 11/32" valves.
• High-temp Viton valve seals.
• Hardened steel rocker studs.
• Hardened guide plates (in combination with hardened push rods).
• Bare or assembled to specifications.
• Sold as pair.