im lookin for an intake for my 89 305 tbi. i found a cheap manifold off a 91 caprice cop car (9C1). i cant find anything that says if it will or wont fit on my engine, or if the tb is gonna fit.
basically, is this a direct fit?

 

That'd be the same intake manifold you have right now. I wouldn't do an intake as your first mod to the car, if in fact this is your first mod. What are your plans with the car?

 

Well yes and no. I agree that an intake swap shouldn't be the first mod. Cold air intake is an easier/cheaper DIY swap, but the most bang-for-buck will always be the exhaust. I don't agree on the intake comment though -- it's not the same.

On the intake manifold itself, as far as TBI placement, attachment, and port locations to the heads -- is the same. IOW fit and function is the same on the Fcar as the Bcar.

BUT, the distributor "hole" is not the same. On the 91-93 B platform TBI cars (Caprice, Roadmaster, Custom Cruiser) the intake manifold had an oversize distributor hole that was also recessed slightly (IIRC). The distributor used on those cars had a shaft housing with a flange to exactly match the size and depth on the manifold, and as I understand it, the shaft on that distributor was also a different (smaller) length.

The purpose for using the one-off manifold was to allow removal/install of the distributor within the tight confines of the cowl overhang, so a special disttrib/intake was needed.

So you could use it on the Fcar but you would need the matching distributor to get it to bolt on and work properly.

Relevant threads:

https://www.thirdgen.org/techbb2/sho...aprice+distrib

https://www.thirdgen.org/techbb2/sho...aprice+distrib

 

Good info to know. I was more referring to it from a performance standpoint. The ports and everything are going to be the same so there would really be no reason to swap that manifold onto his car. I think exhaust and rear gears/posi should be the first mods. Kind of a cool idea though from GM with the oversize distrib hole, that's pretty cool.

 

Ah the stuff we 91-96 B-body owners have to deal with all in the name of a 0.32-0.34 Cd.