Will a FAST 90/90 go on an LT4? What modifications will I need to do, if it's possible?

 

Isn't the fast 90/90 for ls1s only? LS1 and LT1 parts don't interchange.

 

try it out and let us know

 

Well, what I'm trying to get at is-what makes the 90/90 incompatible with an LT4. The throttle body's connection to the air box I'm sure can be modified if needed. It's only plastic. The complication comes in with the manifold, I suppose. I'm wondering if anyone who has had a 90mm intake manifold on an ls1 can tell me or show me how it connects to the heads vs. how an LT4 intake mounts. Than I'll know if its worth the trouble. Aftermarket throttle bodies for LT1/LT4s are in the 52-58mm range. Is 90mm too much for the heads to handle? I have GTP ported stage 2 heads, btw.

 

Never mind, the connection to the heads is at a different angle, plus the intake ports don't match up. Scratch that idea.

 

If it worked, do you think any of us would have LT1 intakes any more?

 

I would. Im poor

 

I wish we could do what Mustang owners do. The use flanges/spacers to make some manifolds work and line up.

 

alot of duct tape will git er dun

 

It absolutely won't work, ever. You can't make it work, so don't even ask. As far as the LT1 throttle bodies being 52-58mm, They are twin 58mm bores my friend, that 58mmx2 in the LT1 tbs.

 

if you need more than a twin 58 there's a huge mono-blade set up that AS&M makes