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Author Topic: rectangular port intake on round port heads  (Read 876 times)
Kelley W King
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« on: October 25, 2010, 01:56:07 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.
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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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« Reply #1 on: October 26, 2010, 12:20:56 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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'69 Z/28
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Kelley W King
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« Reply #2 on: October 26, 2010, 01:18:09 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.
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69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition
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