Our top of the line LS-6 or 6.0 liter style head.The
highest flowing stock casting available.
Designed for use on 4.00" or 4.125" bore engines.
Package includes:
Fully CNC port Intake,exhaust,and combustion chambers
Remove and install all 16 oversize valveseats to accomodate
over size intake and exhaust valves.
Competition valve job.
Ferrea 2.08"intake and 1.600" exhaust standard(2.100" on 4.125" bore version)
Flow intake and exhaust (Flow sheet included)
Mill heads to customers specs for chamber volume
Check all spring heights and pressures and assemble heads 
using .650" dual gold spring,titanium retainer,machined steel locks
hardened spring seats and gm seals.
Other spring options are available including comp 26921,
26918,978 dual 1.440"etc. please call for pricing.