350 swap in place of a 455?

Charger1973 · 12-03-2006, 12:30 PM

Is this possible? Just wondered if everything would bolt up and work ok.

coppertopgmc · 12-03-2006, 06:47 PM

If your talking about a 350 Oldsmobile then yes. 350 chevy NO. 350 Olds and 455 both use the same motor mounts and bell housing pattern. the only thing that may be different mat be the brackets.

2blu442 · 12-03-2006, 08:43 PM

What year and model of car do you want to make this swap in? I agree with coppertopgmc, I've made the swap a couple times and its not hard. The key I've found is that if you are keeping the 350 metal perches that are bolted to the crossmember of the frame, then you need to use 350 rubber motor mounts. If you want to change over to the 455 metal perches, then use the 455 rubber mounts. I've done this swap in 1968-72 Cutlass's and I don't think I had to change the brackets. On one I did need to take the pullys off the 350 and put them on the 455 to get the belts to line up with the power steering pump. If you get into it and find problems, I'm sure there's lots of guys here who can share their experience. John

12-03-2006, 12:30 PM	#1 (permalink)
Charger1973 Junior Member Join Date: Oct 2006 Posts: 6	350 swap in place of a 455? Is this possible? Just wondered if everything would bolt up and work ok.

12-03-2006, 08:43 PM	#3 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 853	What year and model of car do you want to make this swap in? I agree with coppertopgmc, I've made the swap a couple times and its not hard. The key I've found is that if you are keeping the 350 metal perches that are bolted to the crossmember of the frame, then you need to use 350 rubber motor mounts. If you want to change over to the 455 metal perches, then use the 455 rubber mounts. I've done this swap in 1968-72 Cutlass's and I don't think I had to change the brackets. On one I did need to take the pullys off the 350 and put them on the 455 to get the belts to line up with the power steering pump. If you get into it and find problems, I'm sure there's lots of guys here who can share their experience. John __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

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12-03-2006, 06:47 PM	#2 (permalink)
coppertopgmc Member Join Date: Sep 2006 Posts: 27	If your talking about a 350 Oldsmobile then yes. 350 chevy NO. 350 Olds and 455 both use the same motor mounts and bell housing pattern. the only thing that may be different mat be the brackets.