johnspd Posted March 3, 2003 Share Posted March 3, 2003 Question: Can a 455 Olds be swapped for a 350. I have a 1972 Olds Supreme with a 350/TH350 tranny. I have heard this is a simple swap but would love to hear confirmation and any pertinant details from an expert. Link to comment Share on other sites More sharing options...
rocketraider Posted March 3, 2003 Share Posted March 3, 2003 The engine itself will pretty much drop in place using the original 350 perches and motor mounts. However...( <img src="http://www.aaca.org/ubbthreads/images/graemlins/crazy.gif" alt="" /> <img src="http://www.aaca.org/ubbthreads/images/graemlins/tongue.gif" alt="" />) the 350 trans may not last long behind the torque of a 455 unless it's rebuilt and beefed up a bit; you'll definitely need to upgrade the radiator to keep it cool; and if it's an a/c car a 455 is a tight fit at the heater/a-c box. You may need some 455 bracketry too though I think the stuff interchanges those years.If you change over to a Turbo 400 or 375, you'll have to shorten the driveshaft and use a T-400 front yoke. Crossmember can be relocated for the 375/400 trans. Link to comment Share on other sites More sharing options...
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