Quote:
Originally Posted by livelovesole
Thank you alot for the information. I do plan on running a twin scroll setup, sorry for not metioning earlier and I'll deffitnitly look into/ consider the gtx35. First time building something to this caliber, want to be safe. Do you think springs are necessary on a P12 head for my power goals? Assuming their supertech det springs that you use.
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I think the P12 head is just an expensive piece of hardware that doesn't benefit you in anyway shape or form over a P11 head with the same cams. I have yet to see flow numbers for a P12 head. The only thing that supports this claim are the components in the head and slight changes in the casting. They have weaker valve stems(smaller diameter), require custom spring retainers and are more expensive to acquire. The only benefit are the cams are much better than the P11's but that doesn't matter if you're swapping them anyway.
You will need to upgrade your valve springs. You can run the factory P12 springs with the P11 inners for a cheap upgrade. They experience valve float in the higher Roma without an upgrade.