Ran into a local today (on foot) at a Rally. Has a ‘69 Cougar with a 351W. He says the driver’s side exhaust manifold has 2 1/4” collector, passenger side has 2” collector. Did the 351W have options on collector side? He’s looking for one with 2 1/4” for the right side. Thanks for any info.
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Well, in answer to myself for anyone else seeking - the 2” was likely a 289/302 manifold that replaced the original 351W manifold. Apparently 289/302 used 1.75” or 2” and the 351 used 2.5” collectors. Can’t confirm, but I believe this to be the case.
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Sometimes the answers don’t come right away. Asked questions in other parts of the forum. NOTHING. So take it as it comes I guess???
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Factory H-pipes have same size pipe I thought it was 2.25.
Casting #s will be C9…. on the manifolds
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Not feeling slighted really. I just continue to look for answers in several places (books and online) and if I find it first I post back in case anyone else would like to know. Sometimes I have to assume that the people that look, don’t have an answer. It’s still a great compendium of useful information.
I ordered a complete exhaust from WCCC for my 1969 351 W 4v. It was 2 1/4”. I am using stock exhaust manifolds. I believe I read the single exhaust is 2” but I would assume the collector off the exhaust manifold would have to be 2 1/4”. Not sure on that.
Retro, think you have the right answer with someone doing a cheap fix by putting an easier to find 302 manifold on the 351w. The 302 will bolt up to the 351w head. The “ rally guy” could check the numbers on the manifold to be sure. Years ago was pretty common to do cheap repairs on these cars just to keep them running.
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Halbey, Mr_580: thanks for the feedback. Pretty sure that’s what happened. Next time I run up with him I’m going to try and see numbers on the manifold. I’ve got a feeling he isn’t going to want to spring for the correct deal. It’s a little bit of a shame really, it’s a fairly decent car and it’s an “SS” trim package; I just don’t know which level (A,B,C,D). It does have the rocker panels though - probably worth a couple grand right there!