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Forums->Hot Heads Tech Talk->Boring 331 to 354

V8Hippie
Boring 331 to 354


Can a 1955 331 be bored to 354 safely? Did 1955 331 and 1956 354 blocks use the same cores when cast? Appreciate your advice on this - Thanks
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on: Fri 01 of Apr, 2016 [03:57 UTC] reads: 16348

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V8Hippie
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Re: Boring 331 to 354
on: Mon 04 of Apr, 2016 [22:10 UTC] score: 0.00
> Can a 1955 331 be bored to 354 safely? Did 1955 331 and 1956 354 blocks use the same cores when cast? Appreciate your advice on this - Thanks

Thanks very much for your replies George and Bill. I will definitely take heed of your expensive lesson Bill and stick with 331 + cleanup bore.

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George
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Re: Re: Boring 331 to 354
on: Thu 07 of Apr, 2016 [17:40 UTC] score: 0.00
> Thanks very much for your replies George and Bill. I will definitely take heed of your expensive lesson Bill and stick with 331 + cleanup bore.

That's what I'd do!

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George
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Re: Boring 331 to 354
on: Sat 02 of Apr, 2016 [03:54 UTC] score: 0.00
> Can a 1955 331 be bored to 354 safely? Did 1955 331 and 1956 354 blocks use the same cores when cast? Appreciate your advice on this - Thanks

If they used the same "core", I assume you mean they didn't adjust the walls for the bigger bores, the 354 wouldn't be able to be bored out @ all. The 331 & 354 can, in theory, both be bored .125.

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billm
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Re: Boring 331 to 354
on: Fri 01 of Apr, 2016 [16:43 UTC] score: 0.00
I wouldn't do it. I did the same thing to my 1955 after sonic checking the block. The sonic check indicated plenty of wall thickness, but there must have been a minor casting flaw in one cylinder. There is a pinhole leak that has been very hard to find. The heads have been magnafluxed and pressure checked, and the head gaskets are sealing. The engine is being pulled for disassembly after fewer than 500 miles. This is an expensive lesson.
I know many people have bored the 331 to a 354 successfully. Just be aware that, even with the best preparation, you may have a problem. If you bore it 1/8", have the block pressure checked before honing. Most shops will not have the ability to pressure check the block. I had to make my own equipment to check my block.
I haven't sonic checked a 354 block, but I seriously doubt the same cores were used when Chrysler went with an 1/8" larger bore.
Bill


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