rear center and front tbi adapters which do i need?
 

Im wanting to know the difference between front mount rear and center mounts. I Have a stock 1986 4 barrel quadrajet intake, and im looking to buy a carb to tbi adapter but i need to know which of one i need. thank you. And is there a adapter that is ca legal?

Re: rear center and front tbi adapters which do i need?
 

There is an actual GM carb-to-tbi adapter that they used on the 454's with TBI. (afaik they never made a big block TBI intake, they just made the adapter) It has nice smooth transitions, not like the flat plate adapters.
Just my $0.02, ymmv.

Re: rear center and front tbi adapters which do i need?
 

http://www.ihonlynorth.com/forums/at...ead-bore-1.jpg

http://www.ihonlynorth.com/forums/at...ead-bore-2.jpg

Re: rear center and front tbi adapters which do i need?
 

The rear offset is more like the stock tbi manifold. No idea why GM made it like that. The middle ones are for people doing conversions who won't be changing their throttle cable which went to the center in the quadrajets.

Re: rear center and front tbi adapters which do i need?
 

These on the 454 were also plumbed into the heater lines to keep the tbi throttle plates from icing up in extreme cold conditions.