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#1
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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? |
#2
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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.
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#3
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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.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#4
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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. |
#5
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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
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#6
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Thanks
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#7
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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.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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