If not a 455 - maybe a 427 or 454?

grandmas73rocket · 05-19-2003, 11:02 AM

I have a post asking what I need to do to drop a 455 into a 73 cutlass supreme. If the guy building the motor can't find a 455 core can I bolt in a 427 or 454? same questions as the other. I know I need to change the trans but do I need to weld different motor mounts or will this motor just drop in?

thanks
c.b.

wirenut · 11-22-2004, 07:18 PM

Yes you can just drop in a 454. The only thing that I had to change so far was the motor brakets on the frame. they are from year one for a 1970 chevelle. I was lucky my transmission was a unibell turbo 350. so far every thing is working out great.

Oldsguy · 11-23-2004, 04:51 AM

BOP bolt pattern is different that Chevy so the your Olds tranny won't fit the Chevy engine without an adapter.

11-23-2004, 04:51 AM	#3 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 3,167	BOP bolt pattern is different that Chevy so the your Olds tranny won't fit the Chevy engine without an adapter. __________________ Dan '77 Cutlass Supreme '46 2 door

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05-19-2003, 11:02 AM	#1 (permalink)
grandmas73rocket Junior Member Join Date: Apr 2003 Posts: 4	I have a post asking what I need to do to drop a 455 into a 73 cutlass supreme. If the guy building the motor can't find a 455 core can I bolt in a 427 or 454? same questions as the other. I know I need to change the trans but do I need to weld different motor mounts or will this motor just drop in? thanks c.b.

11-22-2004, 07:18 PM	#2 (permalink)
wirenut Junior Member Join Date: Nov 2004 Posts: 1	Yes you can just drop in a 454. The only thing that I had to change so far was the motor brakets on the frame. they are from year one for a 1970 chevelle. I was lucky my transmission was a unibell turbo 350. so far every thing is working out great.