Our latest and possibly best performing LS-6 head for 
stock 3.900" bore Ls-1's,this head incorporates our
latest valve and valve job technology developed for 
the TFS Ls-1 heads. We supply the head with the
TFS/Ferrea 2.040"intake valves and 1.575" exhaust valves.
Intake runner volume is 225cc. Assembled using 
dual platinum springs and titanium retainers with GM locks.
Heads come standard at 65cc but can be milled to customer's
desired volume for compression.