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Old 03-28-2010, 10:16 PM
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Port shape for closed chamber 3856206 heads

I'm trying to replace the flange gasket on my 3856206 heads. They are oval ports according to the Internet off a 1965 396, the exhaust port looks square to me? Is this possible? If so could it be oval intake square exhaust ?

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Old 03-28-2010, 11:00 PM
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All the BBC heads have square-ish shaped exhaust ports. When talking Oval or Rectangular(Square) port in reference to BBC heads they are talking about the intake port only as all the BBC exhaust ports have a square shape.

Only exception is the rare L-88/ZL-1 Aluminum heads with round exhaust ports.
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Old 03-28-2010, 11:14 PM
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What gaskets should I use ? The Hedman web page offers both round and square and the square ones appear to match better then the round ones ? I took off the old gaskets and the indentation around the round gaskets is that square type of " big block" oval
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Old 03-28-2010, 11:27 PM
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Whatever shape best matches the header flange you have.
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Old 03-28-2010, 11:41 PM
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When I replace the intake gasket should the same advice apply or should I use oval ?
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Old 03-28-2010, 11:43 PM
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Yes the same applies.
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