1976 grand prix 455 exhaust manifold
 

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?

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.

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.

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.

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

Thanks

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.