[Stan65]

Crazy question, but does anyone know the intake port dimensions for a 57 347?

Thanks,
Stan

[694.1]

The exhaust ports changed in 55,56, 57,58 but I dunno about the intake side, do you need measurements?
Maybe I can find a '70's gasket to compare to the intake flange...
Curious, what are you working on?

[Stan65]

I think the intake gaskets are 57-60.

Well, to answer the question of what am I working on. I am looking at an old Hilborn stack injection. Thinking of adapting it to a Chevy 348 going in a 32 Ford.

I have plenty of 70’s Pontiac parts to compare, but my understanding is the early stuff is quite small comparatively.

Thanks.

[tom s]

After market intakes were 55-60 and 61-64.Can we assume 55-60 ports are the same size?Tom

[Safari Larry]

'57 has larger intake ports than '56. '57 through '60 have the same size intake ports.

59 & 60 heads should not be interchanged because of different water flow passages for reverse flow (59) vs "conventional" flow (60) heads.

[Jack Gifford]

Originally Posted by Stan65

... looking at an old Hilborn stack injection...

I've never had my hands on the old Hilborn port injectors but I've heard that the throttle bores of the injectors are quite small, even for a good-breathing 389.

[Safari Larry]

Originally Posted by Safari Larry

59 & 60 heads should not be interchanged because of different water flow passages for reverse flow (59) vs "conventional" flow (60) heads.

That's wrong, senior moment! I got to thinking about what I said and '59 and '60 heads CAN be interchanged -- if you use the distribution tubes in heads on 59 block and don't use them in heads on 60 block. The difference in reverse flow and conventional flow is in the block, that's where water passages are different.