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question 350/455 motor mounts

question 350/455 motor mounts

Old June 12th, 2018, 06:25 PM
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Red face question 350/455 motor mounts

On my 1970 Cutlass convertible, I am replacing a 350 rocket with a 455. Do I need to replace the engine mounting pads that are bolted to the frame ? I've seen suppliers that sell 455 pads. Can I re-use my 350 pads?
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Old June 12th, 2018, 06:29 PM
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Old June 12th, 2018, 06:41 PM
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Angry

Let me put this another way. Is there a physical difference between the 1970 Cutlass 350 frame pad and the 455 frame pad?
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Old June 12th, 2018, 07:03 PM
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Originally Posted by matviar View Post
Let me put this another way. Is there a physical difference between the 1970 Cutlass 350 frame pad and the 455 frame pad?
Yes, but there is no reason to swap them. Just use 350 mounts and be on your way.
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Old June 12th, 2018, 07:36 PM
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What Randy said.
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Old June 13th, 2018, 12:16 AM
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So since I am using the original 350 frame mounts, I should use the 350 motor mounts on my 455?
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Old June 13th, 2018, 04:12 AM
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Yes.
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Old June 13th, 2018, 05:34 AM
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Red face

Thanks for Your input. Those 455 frame mounts are pricey !
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Old June 13th, 2018, 06:31 AM
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Search function is your friend. Joe P. has addressed this question probably at least a dozen times or more. Now you are going to save some money.
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Old June 13th, 2018, 10:56 AM
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Originally Posted by redoldsman View Post
Search function is your friend. Joe P. has addressed this question probably at least a dozen times or more.

Probably more like a dozen times THIS YEAR...


I'll also take this opportunity to again suggest that we stop calling them "350" and "455" mounts. Through the 1968 model year, the first design mounts (with the 2261 rubber mounts) were used with EVERY Olds block in an A-body, from 330s through the 455 in the 1968 H/O. The second design mounts (the stronger ones with the 2328 rubber mounts) were similarly used with EVERY Olds block from 1973-up, including the 260 and 455. It was only model years 1969-1972 where the two designs were used in the same year, and this has led to an infinite number of posts.
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