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Old 07-08-2008, 01:27 AM   #1
Scooby Specialist
Member#: 159738
Join Date: Sep 2007
Chapter/Region: SCIC
Location: Socal
2004 WRB STi
Full Race TS, BW 8374 EFR

Default Supertech valves choices

black nitrided or inconel? standard, .5mm larger or 1mm larger.

Supertech recommends inconel valves for turbo applications. The inconel uses a 751 nickel alloy for high heat. This must be good for nitrous, forced induction applications.
I know black nitride gives the valves a better hardess and also reduces valve guide friction. So this must be for higher reving applications.
Which one? With all the oiling issues I don't know if I want to raise the rev limit. I won't be using nitrous either but it is definitely turbo. I'll have a gt3076r, which would be the best choice.

Will going larger .5 or 1mm valves lose velocity which will inturn lose torque?

My builder recommends doing a 3 angle valve job, any input on this. I've read some like to do a dual radius for less swirl.

Last edited by methaddict; 07-08-2008 at 02:11 AM.
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