GM 502 Piston Replacement
 

Where can I get a decent price on a couple of GM pistions. They seem to be on national backorder and the cheapest I found them was over $120 bucks a piece.

Thanks

Re: GM 502 Piston Replacement
 

Buy a set of the J/E srp replacement pistons,they will fit a stock bore after honing with a tq plate (they are .004 bigger-4.470 vs 4.466),they weigh close enough to drop in without re-balancing and best of all they use regular rings,not the metric ones which will should cost you 89$ vs 200$ for the metrics. You will never have a oil consumption problem anymore either,Smitty

Re: GM 502 Piston Replacement
 

part # 139481-498$ in comp products catalog. You can sell your remaining ones on e-bay to people like you that just need a couple,you'll have a resh bore and cheaper rings that seal better,Smitty

Re: GM 502 Piston Replacement
 

Thats what I used!

Re: GM 502 Piston Replacement
 

There is a set of JE forged pistons for a 502 on E-Bay now up for bid, hope this helps.

Re: GM 502 Piston Replacement
 

Thanks guys Thats very helpful...

Re: GM 502 Piston Replacement
 

I just tore down 2 500EFI's....pistons look alright but bore them to 540's. I would think used 502 pistons would be pretty easy to come by.

Re: GM 502 Piston Replacement
 

ws,
Wiseco has them and they are available individually. I bought a single one a few months ago. The only thing you have to watch is the ring size, some of the early GM's had a strange ring size if I remember correctly. I had to buy two sets of rings to get the correct combo for one engine I did about a year ago. If you can't find the part number I have it at the shop and can give it to you Monday.

Bil Koustenis
Advanced Automtive Machine
Waldorf Md

Re: GM 502 Piston Replacement
 

If you need the metric GM rings you can get them individualy from GM