is this a one owner vehicle?
been apart before?
let's do a compression check for a baseline
if rebuilt someone could have put rebuilder pistons it to cut down on the detonation- pinging
you know about octane creep?
carbon build up
If it is an oem early 340 let's figure 9.2-9.7:1 depending on gaskets
too bad KB does not make a quench dome piston for these stock strok stroke 340's
but worth pistons getting custom made
but hard to make one work in a non race motor with stock heads
stroker kit gives you best choices in pistons
