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Will a 400 intake fit 389?

Updated: 10/22/2022
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15y ago

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An intake from a Pontiac 400 will fit a 389 as long as the engine, or more specifically, the heads are from model year 1965 or 1966.

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15y ago
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Q: Will a 400 intake fit 389?
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Will a 1968 400 engine and 400 transmission fit in a 1963 Catalina 389?

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Will 389 heads fit on 400?

Your 389 heads will fit on a 400. Depending on what code you have (093?) you may have to do some porting to reach the flow numbers of a stock 400 heads just because of the smaller valves. A pair of #16 for instance in stock form had 2.19 Intake and 1.88 exhaust valves. Since originality does not seem to be a problem, also keep in mind that for a performance type rebuilt head, you are near the same $ as buying a new set of alum heads which will flow better and weigh less and handle detonation better. GL.First of all....the stock #16 heads were 2.11/1.77. One other thing to keep in mind is that the 389 and first year of the 400 used a different valve angle head. If you use those heads on the newer style piston in the 400 make sure you check valve to piston clearance.


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