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Old 01-17-2004, 10:12 PM
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455 olds

i'm swapping in a 455 olds bb in my 81' toronado....will the trans bolt up w/o any modifications? it has a 307 now...

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Old 01-18-2004, 05:49 AM
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It should fit without any problems.
You will definitely want to consider doing something about the exhaust manifolds though, the 455 won't breathe right through the 307 manifolds.
And if the 455 manifolds are for rear wheel drive they will not work, at least one will be pointing toward the transmission.
You can get reproduction manifolds for the 455 in the front wheel drive.
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Old 01-18-2004, 07:25 AM
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any 307 olds that i'd seen had smaller exhaust ports , so you'll have to find an early 70's toronado , for the manifolds, the 307 uses the bop trans same as the 455. you'll need a bigger rad too. the 455 is a couple inches wider at the top
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