260 / 350 Exhaust Manifolds

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Apr 8, 2025 | 12:18 PM

rudeke

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Joined: Jun 2023

Posts: 22

260 / 350 Exhaust Manifolds

Could anyone tell me if these are interchangeable? Would 260 exhaust manifolds fit a 350 ('75 Cutlass)?

Thanks, ER

Apr 8, 2025 | 03:36 PM

matt69olds

Registered User

Joined: Jan 2010

Posts: 6,120

From: central Indiana

The will physically bolt on, but im guessing there will be port alignment issues. If I remember correctly, the later 307 and most 260 engines used the puny stamped steel tubular manifolds.

Apr 9, 2025 | 05:28 AM

Olds64

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Joined: Jul 2007

Posts: 18,263

From: Edmond, OK

I figured the manifolds would be identical and cast iron. Don't those manifolds have the threaded ports for the smog pump lines?

Apr 9, 2025 | 05:41 AM

BlueCalais79

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Joined: Jan 2009

Posts: 1,712

From: McCormick, SC

The ports for the 260 are smaller than the 350, this would not be a good fit. Best to stick with the same displacement size IMHO.

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