Quote:
Originally Posted by KC64
So,,, does the ported LT2 bolt right in place without any modification?
|
The short answer is no. But Phastek sells a DIY modification kit with nice instructions. GPI will do the modifications for you for an extra fee. I enjoy the DIY challenge and do enjoy pinching the occasional penny. You can pick up the LT2 intake from Rockauto for $190. The cover is an extra $120, if you like max bling. I don't believe Phastek or GPI sell the cover, but I could be wrong, I know Phastek doesn't per conversation with a sales agent.
From what data I've managed to find on dyno results, porting produces marginal results, and no matter what you do you'll likely never be able to port match to a set of ported heads. As far as porting the inlet for the TB, it's designed for 87mm, but with an adapter you can bolt up the 95mm LT5. I suspect the gains would be marginal for NA, but if you're scratching for every last HP, the LT5 TB comes pretty cheap. But if you're paying to have the manifold work done, then it's really no sweat off your back.
The real PITA comes when you want to use the LT4 HPFP or similar, as you'll need an intake port spacer to lift the manifold higher due to clearance issues with the taller fuel pump. You already have to shave the bottom ribbing of the manifold to clear the fuel lines and LT1 HPFP. The LT4 is about 3/4" taller than the LT1.
I finally have my engine far enough to start dry mounting the pump and LT2 IM so I can get detailed pictures for my build thread. Since I'll be measuring pump lash, it'll be a good time. It drove me nuts for weeks because no one else seemed to talk about the LT2 on supercharged applications, but I suppose it's because there are so few of us using the LT2 vs the MSD or bigger.