Originally Posted by
ImportLabSRT
Actually Josh, as long as it is a 55, not a 500 or 550, they are the same valves. I have done extensive research on this topic. I would not spend the money on valves and porting on N/A or SRT-6. The HP/$ ratio is just not there. Even with a Code3 supercharger pulley and 185mm crank pulley, the gains were marginal on Eurocharged black C32. That car had Schrick cams too.
The NA 55 valves are the same bore as the 55K's????? Crazy, I didn't know that lol.
That's what I was saying though, not worth it unless you just have tons of money to blow. The gains on a 320 wouldn't even be close to 20/15%... Even on a 32 they wouldn't be that high. The gain's I mentioned were a 55K, and that was overall flow increase and it has 2 more cylinders. I'll try to find the thread.
EDIT: And the 5.4's are much bigger displacement cylinder/cylinder than the 3.2's.