Exhaust manifolds for 371

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October 13th, 2023, 07:18 AM

Jon442

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Exhaust manifolds for 371

I need a good set of exhaust manifolds for a 371. Anyone have set they want to sell?

October 13th, 2023, 09:11 AM

2blu442

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I believe 57-58 and 59-60 have different manifolds. Do you know what year of 371 heads you have?

October 13th, 2023, 02:37 PM

Jon442

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I believe they are ‘58.

October 13th, 2023, 07:14 PM

Charlie Jones

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Quote:

Originally Posted by Jon442

I believe they are ‘58.

There will be a two digit number cast on one exhaust port on the head.
#14 is 1957
#16 is 1958
# 18 or 20 will be '59 or '60.

Last edited by Charlie Jones; October 13th, 2023 at 07:18 PM.

October 13th, 2023, 07:20 PM

Charlie Jones

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Quote:

Originally Posted by 2blu442

I believe 57-58 and 59-60 have different manifolds.

Yes.

October 17th, 2023, 07:23 PM

Jon442

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Here are the photos provided by the shop:

October 17th, 2023, 08:22 PM

Charlie Jones

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What you have there is one 1957 head (#14) and one 1958 head (#16).
I don't know if these heads both had the same size chambers.
I know there was a compression difference between 1957 (9.5 to 1) and 1958 (10 to 1).
To me, it would be important to CC the chambers on both heads to ensure that all eight cylinders have the same compression ratio.