SRE R+R "Racing" aluminium cylinderheads, GM LS3, 4-bolt, rectangular ports.

Item number: SRE-42006-R

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!

The SRE-R+R Racing cylinder heads are completely machined (ported, larger valves, etc.). This makes the R+R cylinder heads very suitable for various branches within motorsport. These cylinder heads are built entirely to your specifications.



  • Aluminum A356 casting.
  • Heart shaped, polished combustion chambers.
  • Ported and manifold matched runners.
  • Stainless steel or inconel intake valve.
  • Stainless steel or inconel exhaust valve.
  • Racing profile, ductile iron seats. 
  • Valve springs (Howards or equivalent).
  • Hardened chrome moly or titanium 10° retainers.
  • Hardened chrome moly or titanium 10° valve lock's. 
  • Bronze valve guides for 11/32" valves.
  • High-temp Viton or no valve seals.
  • Bare or build to your specifications and needs.

Please mail us for more information and pricing!