Racingjunk Forums - Is .060 over to much for a 350?

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- - Is .060 over to much for a 350? (https://www.racingjunk.com/forums/showthread.php?t=28270)

I've had a good many 010 blocks bored .060 & never had a momments trouble, but I'd never go .080 over :shock: , IMO> thats just asking for it.
Bottom line, have it thoroughly checked out by a competent machine shop.

i had a 350 block bored to 4.125 because we had all the other parts laying around and needed a motor asap. we filled the bottom 1/2 with block filler. It ran a little warm :D I'd come in after a 15 lap feature @ 250*. This is in a imca modified, i turned it 7500, ran it about 10 races to finish out the season.

Running a .060 over block now with no issues,of course it filled from the waterpump holes down.Used a many of .060 blocks without issue..

Quote:

Originally Posted by Tod74

Quote:

Originally Posted by hink

At .060 over on a 350 block I would sonic test first as we have not seen many blocks that would make .060 over and be used in a performance application.

We had a customer bring in a block and it sonic tested .120 on the thrust side and he said the core shift was good but I said its not a very good indicatior.

At .060 make sure its plate honed as well.

I was surprised at this because I here of guys going .060 over quite often...but to the OP I would trust this guy's advice over most anyone in regards to engine block machining .

Thats why we sonic test them and I have some that I know Won't go .060 over but if you think they are OK I guess it makes a big differance.

One thing to keep in mind, from .060 to ,080, the cylinder is only .010 thinnner, as its a diameter. .010 isn;t much, and won't make or break it.

Frank