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Cadillac 331 exhaust manifolds

Started by Dave A, February 21, 2010, 09:22:53 PM

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Dave A

February 21, 2010, 09:22:53 PM
Did cadillac use 2 different exhaust port sizes?  I have a 331 engine and 2 sets of heads and both have sets of heads have a different size of exhaust ports and everything else lines up just fine.
Dave Anderson

Pat

#1
February 21, 2010, 10:02:41 PM
Dave,
Sounds like the other set of heads is off a 365..they had larger ports.
Cheers,Pat

Joe 12138

#2
February 24, 2010, 04:25:21 PM
The '49 thru '51 heads used smaller exhaust ports, as they used a 2 barrel carb. When the 4  barrel came out with the '52's, the exhaust ports were larger as well.

Dave A

#3
March 01, 2010, 06:49:13 PM
Will the two barrel manifold work on the 4 barrow head. I have a set of heads with smaller ports but they will need a lot of work.
Dave Anderson
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