Using rectangular port intakes on oval port heads

[Jeff H]

This is an interesting topic since the 70 L78 I just got has the stock rectangular port intake with oval port heads. I thought it would be a terrible mismatch, but the car seems to run incredibly strong and doesn't seem to mind the mismatch. I have the correct rectangular port heads to go on it, but it might be better off with the slightly lower compression oval ports for now.

[CamarosRus]

My 69 Camaro COPO clone runs this above combo of oval heads and 163 intake. Car cruises and drives fine. Notice Eric Jackson carb............

[WILMASBOYL78]

Next motor I build is going to have that combo. Strong bottom end with maybe 10.5 to 1, L78 cam, 163 intake, oval port heads. Add a little gear and 4 speed and watch out! I think if you have a good set of heads that have some mild work done you can probably pull real strong to almost 6,000rpm. That's enough on the street...

wilma

[427TJ]

Hey Chuck,

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[YENKO DEUCE REGISTRY]

We are doing this exact combo on Benjamin's Nova, but with a little higher intake manifold! How much impact does the oil shield and blocking the crossover have?

[Salvatore]

Another B/MP nova coming to life!!

[TimG]

Fun topic, I'm enjoying this. Nobody can tell the oval port heads from the outside, either.

[earntaz]

This is a repeat from another thread -- I have done the exact thing on a .060 out 427 ... it ran great. The reason? Got a hell of a deal on the intake -- had a cracked bolt hole and bolt twisted off in the thermostat housing. TAZ

[ds1]

There is a visual difference on square port heads. They have a tab cast on the outside parting line on the ends. But who cares if it is what you want. I ran a square port intake on oval port heads and I ran fine.