[Groucho]

I know there were changes somewhere around 1964(?). Can someone tell me the exact year groupings for intake interchange? THX

[Stuart]

Fred Teufert has an interchange chart on his website for various Pontiac engine parts: http://www.teufert.net/pontiac/page2.htm

[Groucho]

Originally Posted by Stuart

Fred Teufert has an interchange chart on his website for various Pontiac engine parts: http://www.teufert.net/pontiac/page2.htm

thank you

[Groucho]

I didn't know there were so many differences. I thought there were only 2-3 different intake configurations in all. That chart shows around 6.

[Overkillphil]

That's curious, unless I am seeing things it would appear the 1970 2 barrel intake was used again in 1978! Hmmm, 70 had no EGR provisions but 78 would have.

[tom s]

basic 55-60,61-64 and 65 and later.301s are diff from all.Tom

[Groucho]

Originally Posted by tom s

basic 55-60,61-64 and 65 and later.301s are diff from all.Tom

That's more along what I had thought. Thank you. BTW, did you see the list that was offered earlier?

[Tom Vaught]

Some "extras" are in the list due to the EGR provision in the manifolds.

"Basic 55-60,61-64 and 65 and later.301s are diff from all" is very true but not all of the combinations, just the basic "families"

Tom V.

[pfilean]

61-64 saw some changes even though they would interchange from a bolt pattern standpoint. 61 had no PCV allowed for - that came I think in 62. Then the 64 3x2 was a little higher carb base. Some think of those as a "high rise". But all will bolt on a set of 61-64 heads.

[Tom Vaught]

Another change (which helped old guys bending over fenders) was factory Aluminum Manifolds for the RA-IV and 455 HO engines. Course then pfilean could post up that the 61-64 engines could also use the 421 SD Aluminum manifolds. Where do you stop?

Tom V.

[tom s]

I posted the intakes that would bolt to the year heads.The only std deck bastard is the 61-62 SD 306 Heads and matching intakes as they have 55-60 water pattern but use the 61-64 water by pass from intake to timing cover.Also the 991 61-62 2-4 SD intake has a removable freeze plug to allow it to be used with 55-60 and 61-64 heads.Tom

[GRX]

Differences not mentioned on that page ... the '67 intake was unique in that they had exhaust ports at the carb mounting flange.



here is a '68:



In 1970 they went with a more solid design in the center. This makes the 68-69 intakes a more popular choice for exhaust cross-over removal.

[65madgoat]

Can anyone post the offset differences in carb flanges on stock vs popular aftermarket intake manifolds?

[Tom Vaught]

Factory Q-jet Manifolds could be close.

Aftermarker Holley Intakes could be all over the place: Edelbrock vs Holley, Nash/Warrior
vs Holley, .................................................

Tom V.

[Half-Inch Stud]

I remain amazed that 1968 4 BBL Manifold was same for 350 thru 428HO.
As were the iron 1969 4BBL to 428HO, and iron 1970 4BBL to 455HO.

Stroke x Bore ought to determine runner size for best result, yet CSA didn't budge.

[25stevem]

They did not need to budge it I would have to say!
Just look at the power level that can be made with a 67 and up non EGR intake manifold .