350/454 swap??? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-26-2004, 10:22 PM
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350/454 swap???

I got my 454 in my truck I used the 350 motor mounts. Herd they were the same. I had bought 454 mounts but when I went to install them the bolt holes dont line up so I used the 350 mounts. My problem is tat my oil pan is sitting on or just off of a crossmember. Is this because the motor mounts are were different? Would the other ones make the motor sit higher? Should I have just drilled holes for the 454 mounts?
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post #2 of (permalink) Old 02-28-2004, 08:26 AM
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Re: 350/454 swap???

I'm not so sure the 350 and 454 mounts are the same. The reason I say this is because I did a 454 to 350 conversion on a 1977 Chevy 3/4 ton Camper Special and found out that there were different motor mount part numbers that year. [img]images/graemlins/frown.gif[/img] I ended up getting to be good fiends with the Chevy dealership parts people for my conversion headaches. [img]images/graemlins/smile.gif[/img]

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post #3 of (permalink) Old 02-28-2004, 10:19 PM
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Re: 350/454 swap???

If I cut out a chunk of the crossmember or pound it down so the oil pan does not hit would it hert any thing?
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post #4 of (permalink) Old 02-29-2004, 01:36 AM
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Re: 350/454 swap???

cutting is bad for things. punding down will do one of two things. either the deformation of the X-member will weaken it due to the physical deformity, but in deforming it you're actually strain hardening the metal. it makes it more brittle(marginally) but stronger too(marginally) so if you weight it all out wholistically, no beating is not a good idea, but I"d do it on mine and wouldnt worry too muchabout it
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post #5 of (permalink) Old 03-01-2004, 10:52 PM
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Re: 350/454 swap???

the motor mounts are NOT the same but SHOULD look the same and bolt up the same ..... the difference is in how hard the rubber is ..... new mounts may solve your problems ..... also is is possible that you have a non stock oil pan.
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post #6 of (permalink) Old 03-01-2004, 11:29 PM
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Re: 350/454 swap???

We have some plates that go between the block and the motor mounts that we are going to try. There were no plates on the motor that was in there.
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