[C1] Boring a '57 block
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Boring a '57 block
Hey guys, after doing some research on my '58 block, it says the '58's were cast with much thicker cylinder walls than the '57 blocks. I have a '57 that needs bored but I don't want to throw $$ at a lost cause. Anyone know the limits on boring a '57 548 block? It "might" clean up at + .030"...
Thanks for any insight.
Dave.
Thanks for any insight.
Dave.
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I have several 548 that have gone .1 over.
It was not uncommon back in the day
You can have it checked - see how thick it is
It was not uncommon back in the day
You can have it checked - see how thick it is
Last edited by csherman; Oct 6, 2020 at 11:07 AM.
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Keep in mind that ALL '57 '548 blocks started life as 265 blocks and were factory bored .125 to turn them into 283 blocks.
Proceed with caution!
Proceed with caution!
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I would have the block sonic checked and base my decision off of that. Same deal with the Pontiacs I work on.....some 389's will go .090" over and some are only good for .040. Depends on the amount of core shift and the day of the week it was cast, pretty much. No way to tell unless it's sonic-checked, unless the lifter bores are way off, which indicates a fair amount of core shift from the get-go.
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It's been sitting in the shop for 30+ years. Looks to be standard now, but with the rust in the cylinders its really hard to tell exactly what the current bore size is and what it will clean up at. I'm only going to take it to the next available piston size. Thanks for the info, much appreciated. Dave.
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I bought it. $5.
Last edited by MikeM; Oct 6, 2020 at 05:49 PM.
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It was 1958. I was 14. Just finishing the 8th grade. A buddy said he had a 283 bare block from his brother's '57 Chevy. Bored to 4". It was a real 301! Hot dog! I was mesmerized. I had to have it. (I'm finally going to own a SBC engine. This is my start). Only problem, it had a split cylinder wall. Too thin. Buddy convinced me sleeves were cheap.
I bought it. $5.
I bought it. $5.