how far can you bore the 4.8 block?


Asked by Jun 28, 2016 at 06:15 AM about the Chevrolet Silverado 1500

Question type: General

looks like the bores are thick and the block is cast iron so it can be bored not
needing sleaves. how thick are those cylinder walls?

3 Answers


Not sure on how thick the cylinder walls are but you can go up to .040 in diameter over and be safe. Try not to go over .030 over.

Bob Beaman

If it is a thin wall casting going too large on the bore will result in overheating problems. This was a problem way back when on Ford small blocks. A good machine shop should be able to tell you how far is safe.

Bob Beaman

Wow, according to the link an iron block 4.8 can go .130" That is huge! Read about it at the link.... to/engine/1412-max-overbore-for-ls-blocks/

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