Author Topic: rectangular port intake on round port heads  (Read 1031 times)

Kelley W King

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rectangular port intake on round port heads
« on: October 25, 2010, 06:56:07 PM »
My brother has whats is supposed to be a 72 454 in his 69 ss. He was told the heads were rectangular port but they are not. Since the car looks like a L78 he bought a 163 L78 intake. If installed on the round port heads will it work? Which gasket to use? Will performance suffer over and aftermarket aluminum round port intake? Any opinions appreciated.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition

JohnZ

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Re: rectangular port intake on round port heads
« Reply #1 on: October 26, 2010, 05:20:56 PM »
I know of several Corvette guys who have dealt with the same situation - the rectangular-port intake will work with oval-port heads (using the rectangular-port gaskets), but performance won't be optimum due to the airflow disturbance caused by the "step" at the interface between the intake and heads. It'll work fine for a cruiser.
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Kelley W King

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Re: rectangular port intake on round port heads
« Reply #2 on: October 26, 2010, 06:18:09 PM »
Thanks John,
I think we will try it for appearance. The car has more power than the tires can take already. This is that same LA car orange car Joo8 we discussed before.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition