Thread: 350 TBI with 400 heads???

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Hey there.

Ive been looking around this forum and looks like the place to start asking about a 350 TBI engine I am looking at doing. I currently have a 350 TBI from I think an 88 Blazer, in an 86 RX7. I wabnt to get a 350 built moderately well , and use the Edelbrock TBI replacement intake system with it.

People keep telling me to put 400 heads on the 350... Ive been looking for some information on doing this, so hopefully soemone her can help. Can the 400 chevy heads go right on the 350 block, and still use the regular TBI injection for now until I get the Edelbrock set up?? I'm worried that the intake manidfold won't line up right, or that the exhaust manifods won't line up or attach correctly either. Anyone know for sure if this will work, or better yet, know of a web page that details the mix of parts, with even some more info on the 400 heads and why they would work better? I have a spare 350 and the 400 heads ready to send off to get freshened up.

This'll be my first V8 rebuild, so any other little tips and suggestions would be greatly appreciated.

N

The only difference between 350 and 400 design is steam holes in the 400 head. There is no such thing that I know of,as a 400 head. Go with some 882 casting and be happy.

The center intake mounting bolts on the 1986 and later heads were changed to a different mounting angle. Because of that, the TBI intake won't bolt on to the 400 heads. I think you may be able to slot the bolt holes in the intake to make it work.

Bob

OK thanks guys, Ill just freshen up the 350 I have

N

Nook,
You have gotten the best advice about 400 heads, I understand they are not a very good head at all and most people use 350 heads with added steam holes. What pistons are you using and what year are your 350 heads?
I am editing this because of another post. Check out the Engine gurus - Need your input... thread and this might help you make a decision (just add good cam).
Jim