What is the maximum safe cylinder overbore?
A. Oversize Jeep 4.0 pistons are available up to +0.060″. Cheap and readily available Small Block Chevy (SBC) type 4.00″ bore pistons have been used on some strokers but since this requires a +0.125″ cylinder overbore, the cylinder walls of the block must be sonic tested to ensure there is adequate thickness. Minimum cylinder wall thickness should be 0.180″ on the thrust side.
