455 Motor Mounts - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 02-10-2009, 04:19 PM Thread Starter
 
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455 Motor Mounts

Okay I have a 68 gto cvrt. I found 455 frame motor mounts, I was wondering about the mounts that go on the block. I know they are different than the 400 ones I had. Is there a better upgrade than the stock old rubber ones, I'm pushing around 600hp. Thanks


what are the major differences?
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post #2 of 13 (permalink) Old 02-11-2009, 07:12 AM
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If you swap out to solid motor mounts, be sure to change the tranny mount to a solid one too. Personally, I think it transfers too much vibration through the frame, but some people like that.
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post #3 of 13 (permalink) Old 02-11-2009, 11:24 AM
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Another option would be polyurethane. Polyurethane doesn't soften, compress or distort like the rubber ones......



SOLD.....
462ci, 4spd
Performer Intake, Mild Cam
Pertronix Ignitor III
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post #4 of 13 (permalink) Old 02-11-2009, 01:14 PM Thread Starter
 
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Another option would be polyurethane. Polyurethane doesn't soften, compress or distort like the rubber ones......
I've looked for the poly's and couldn't find any for the pontiac... you won't happen to knw of a place that sells them?
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post #5 of 13 (permalink) Old 02-11-2009, 02:04 PM
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Start looking here:
Performance Suspension Technology - PONTIAC - V8 267,305,350,455 1974-92
I'm not sure what year your 455 is, but this company carries alot of urethane and ploygraphite parts. Polgraphite is supposed to be quieter. Although, I've never heard any noise made by other urethane bushings that I've installed, ex. body bushings... When I get a chance later today I'll do more research for other vendors.... As stated by PST you may have to use your current mount with the poly insert.....



SOLD.....
462ci, 4spd
Performer Intake, Mild Cam
Pertronix Ignitor III
Accel Super Coil, Accel 8.8mm Wires
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post #6 of 13 (permalink) Old 02-12-2009, 10:21 AM Thread Starter
 
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Thanks for the help
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post #7 of 13 (permalink) Old 02-12-2009, 11:03 AM
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If your worried about if the engine will push too much power for the stock style mounts and want some peace of mind, you could bolt a small length of chain on the drivers side along the mount bolted to the engine and frame. So if the mount fails the chain will catch it.
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post #8 of 13 (permalink) Old 02-12-2009, 04:06 PM Thread Starter
 
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At this time I'm looking into the solid mounts... just how bad is the shake?
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post #9 of 13 (permalink) Old 02-12-2009, 05:23 PM
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How ballanced is the motor??
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post #10 of 13 (permalink) Old 02-13-2009, 11:16 AM Thread Starter
 
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How ballanced is the motor??
I would say pretty good those Kauffman boys built it
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