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Old 06-25-09, 12:37 PM
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CadVetteStang CadVetteStang is offline
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Cadillac(s): 70 Eldorado w/500, 82 Eldorado w/472, 72 Mustang w/Cad 500
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Join Date: Apr 2008
Location: Little Rock, Arkansas
Age: 44
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Re: will fit a 500 in a '67 eldorado

It is a doable swap. Someone from my Caddy performance group did it. I’m not sure what mods are needed, but from the above reply, I would think that pulling the whole engine/tranny unit from a 70 up Eldo. I’m not sure if the 71-76 spindles are the same as 69 - 70, but while the engine is out, it would be a good time to do a disc break upgrade since the steel lines would need to be changed too. If you can find a 69 or 70 in salvage, then you can get everything you need and it should be a direct bolt on. They guy who did the swap said he also wants to eventually install a blower.

Note: The exhaust outlets on the heads come out in the same location as the 460 Ford does (the engines were designed by the same man) so it is possible that 460 Ford headers could be found that would work in that body with modifications. The exhaust flange would have to be changed to get them to bolt to the Caddy block – but Caddy 500 performance shops sell those flanges as well as header gaskets. They may also know if anyone has found headers that will fit that body; when I get my 70 Eldo back on the road, I will be looking for headers – but they may have to be custom built for it.

~Good look with the car, and don’t let me talk you into too many upgrades at one time- it is better to finish it one mod at a time and drive it than to tackle too many projects at one and wind up with a basket-case that sits in the garage for two years.