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Old 03-30-2004, 10:01 PM
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Headers for 85 G-body w/ 455 Rocket

Has anyone ever tried putting an Olds 455 in a mid 80's G-body? I am planning on this, and trying to find out if there are any headers available. Would the ones for mid 70's Cutlass's work?

Thanks,
Rick

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Old 03-30-2004, 10:13 PM
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Chevy heads tend to lean in toward the engine so they provide about an 80 deg incline on the side of the engine giving plenty of room for headers

Olds heads on the other hand are just like a big block of iron, so they lean about 45 degs on the side so the headers in a g-body olds get smushed right in between the engine crossmember and the engine block. It sucks to put headers on a G-body olds and I dont imagine a 455 being any easier, but the std. oldsmobile exhaust manifolds really suck! I mean the widest exhaust you can have is 2 1/2in because the drivers side loops back into the pass. side manifold.

So to answer your question, no the headers from a 70's olds will not work. They hit the steering shaft, and other parts. Hooker makes headers for G-body olds along with dynomax.
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Old 03-30-2004, 11:21 PM
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I just last week sold a new set of headers for your combo on Ebay! Where were you!
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Old 03-31-2004, 07:32 PM
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Thanks for the info, 87442lover! I know it was somewhat snug for the Chevy 350/TH350 that is in it now!

BOBCRMAN: That figures!!! About how much did they go for, so I have an idea how much to save for!
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Old 08-25-2005, 09:09 PM
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yes, there are headers available. i have the same application (a 1970 455 in an 84 cutlass) hooker makes a super comp header for just this application. i have a set myself. they are in two pieces, your front three and then the back tube. the back ones for cylinders 7 and 8 go around your frame, and you have to cut out part of the inner fender so it can go around.
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