Cadillac Allante Forum Discussion, Possible to replace a 4.5 with a 4.9? in Past Cadillac Vehicle Discussion; I'm kicking around the idea if replacing a 4.5 liter Allante engine with a 4.9. I think they are very ...
I'm kicking around the idea if replacing a 4.5 liter Allante engine with a 4.9. I think they are very similar except for displacement. If anyone call tell me, off the top of their head, what problems would be encountered with such a swap I would appreciate it.
Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
East Boston MA.
Anything is possible, but there would be some modifications required.
The 4.5 in the Allante is not the standard 4.5, it's a high output version, with 200 HP, and 270 FT-LBS of torque. Same HP as the 4.9, and only 5 less FT-LBS. If you're looking for a performance upgrade, you might want to consider selling, and buying a '93 with a Northstar.