iowacj
I recently acquired a 360 for my CJ project. It was seized so I tore it down. The cylinder walls have some pitting so it will likely need bored. Problem is, the pistons are .040 over so it has clearly been bored at least once already. Can I go to .060 without causing overheating issues or long term relibility problems?
ironman_gq
have the walls sonic checked for thickness. with most you can go .060 over without too much trouble but its iffy without checking cylinder thickness.
tufcj
I agree on the sonic check. A 70s vintage 360 should go to .060", maybe to .090". The bigger oversize pistons are harder to find than .030". The later vintage 360s have a little thinner walls.
Depending on the condition of the crank (has it been cut?), you may want to look for another builder core.
Bob
tufcj
ironman_gq
you can buy a whole longblock that has been blueprinted and all for about $1800 and send your stock one in for a core deposit.
iowacj
Thanks guys. I think I'll slap the 304 in it for now and use the 360 as a core possibly for something different. I'm pretty sure the crank has been ground once already since the guy told me it was a re-manufactured motor 75,000 miles ago. I don't think the Dana 30/AMC 20 combo would've held up too well with heavy breathing 360 I'd want to build anyway.
jeepsr4ever
Some 360 blocks can handle a 4.200 bore +. The best thing you can do is sonic check the block. I have only heard of a very few 360s that wouldnt take a .060 bore.
