1978 455 Olds or Unknown Caddy 502??

[Guest]

Which should i buy the unknown year 502 or the 78 olds 455 and how much would it cost to drop it in a 79 Lesabre??

[NTX5467]

Considering that Olds V-8s did come from the factory in that chassis, in 403/350/307 sizings, I would go with the Olds 455 for that reason. Probably all that would be needed is to get the motor mount brackets from a salvage yard. I suspect the 455 motor mounting pad is the same as on the 403, et al., but you need to verify that. Also, remember that you'll also need to upgrade the transmission torque capacity too.

The Cadillac 500 cid V-8 was from the prior chassis so the possiblity of it taking more to make it work (mounting and all other hookups for exhaust, radiator, EMISSIONS, and such would be much more work.

Putting the earlier model engine in the later model car still means the later model car would be the determining factor in what emissions standards the vehicle would have to pass to be legal for street use, unless you can register it as an "antique" which would also mean "not everyday use" too. It would also be much easier to make the Olds look correct in that respect.

NTX5467

[Guest]

Thanks for the help.