We do a lot of Jasper engines at the shop . I'm a nosy guy so I always look in the plug holes and what I see alot is 040 over pistons. I'm a fan of as little boring as possible . The EFI302 engine runs such a perfect mixture that bore wear is minimal . So you can clean it up with as little as 010 but can't find pistons. Unless its running and guaranteed I'd be care ful. bob
0.40 is the limit without sonic testing the block.
I have seen a .60 over 302 in a mustang I bought a few years ago. It had a rebuild engine from a local shop. The owner told me the head gaskets needed to be replaced, that water was getting into the oil. I thought it was the intake gaskets, I would fix it and turn it around real fast and make some money. Anyway as I tore it down I found a small crack in the block in the middle of # 3 cyl then I looked at the pistons to find 60 over.
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