DLong

iTrader: (1)

Let me give you some background I have an '03 Z06 with a twin turbo setup. The car has a LS6 with 243 heads. I just bought a 6.0 truck engine with the 317 heads. I plan on running high boost after I buy a set of AFR's but for now I will use one of these sets. I know the 243s have the hollow intake valves and sodium filled exhaust valves but which set is better for boost. I am only going to run about 15 psi or so. The reason I am building a motor is because I broke a ringland. I was stupid and running without methanol at 10psi on a 10.5 to 1 motor.

NemeSS

iTrader: (127)

same head design, but 317 has larger chamber at 71cc
the 317 will drop the scr over the 243 with 65cc chamber

Mr.Big

317's rock!!!