depends on the year of the block, 58-62 may take .125, 63-67 .060 max .... other small blocks, check availability of oversize pistons, I think some 4" bores are chancey even going .060

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot