[redonred81]

Question for you guys.i have a left driver side exhaust manifold with a crack.i was wondering its part number and what other years or models compatible to replace it.thanks in advance
Anybody here have one?

[1965gp]

That should interchange with almost any Pontiac motor from that era. I’m sure someone on this forum has one they can send you. Is it rear or center exit? (Been a while since I’ve had a car with manifolds.

[b-man]

It’s probably a rear exit manifold, nevertheless pretty much any mid-’60s to mid-‘70s manifold from an A-body, G-body GP or even a 2nd-gen F-body will interchange. Those exhaust manifolds are very generic, the 455 uses the same manifolds as the smaller displacement engines so there’s nothing really special about them.

[Sirrotica]

It has to be from a car that came with a catalytic convertor on if from the factory, they switched from 2 bolt flanges to 3 bolt flanges in 1975. There are only rear exit manifolds after 75.

Basically any 75-79 350-400-455 manifold will work, 301s are different having an extra bolt into the head between the center exhaust ports.

[b-man]

Very good points Brad on the 3-bolt exits on manifolds used with catalytic converters.

You might consider contacting PY member ‘ol Pinion head (Roger) who probably has exactly what you need in his vast parts inventory: https://forums.maxperformanceinc.com...r.php?u=141176

[redonred81]

Thanks

[camerjeff]

I have the stock exhaust manifolds from my 400 powered 78 Catalina, I can get some pictures today after work if you are interested, $25.00 plus shipping. They came off a Montana car with around 75K miles so are in decent shape.