What are your power goals, if any? If you are only doing a rebuild, and mabey some basic mods, then new stock ones will be fine....If you intend to build a high HP engine, then forged is the way to go.
JE's are great pistons you can use them for a D/D but they have a bit of slap when cool. Once they warm up they wont slap as loud but you can still hear it. I would say go with Wiseco simply because the skirts on their pistons are longer then JE and slappage is not nearly as loud as say JE. Just as good btw!
For stock rebuild parts (not OEM, but excellent in quality) contact Ted at engnbldr.com. He quoted me $520 for a master rebuild kit, Rock brand pistons (heard good things about them), rings, overhaul gasket set, oil pump (big advantage) etc. May want to see if you can get your hands on some of his hard to find o/s valves for the 7m as well
so ya im building my engine too hopefully w/ in a month, anyways i've been looking at pistons so which ones do you guys like more the Wiseco’s pistons or JE pistons, and how bad is the slap on the JE pistons, how bad is it for long term?
i cant say from experience but ive heard JE's have the worst slap and that the weisco's are the best because they have the longest skirts, i havent heard anything bad about ross either. i am running weisco.
Do NOT get Roc or Nippon pistons from Ebay. I bought a set of .040 overs for a mild engine build and the ring lands shattered clean off on 3 of 6 pistons.. there were some *small* flashmarks from detonation, but the biggest flashmark (about dime sized) wasn't even on one of the pistons that broke, one piston that broke still had a clean thin coat of carbon on it with no sign of detonation at all. The only thing that could have done it in was the cylinder pressure of ~380whp.
I've ripped apart 100k stock 7M blocks that had flashmarks that blew all the carbon off the dish of the piston on all 6 and they still were otherwise 100% intact. I strongly believe that the Rock/Nippon pistons are below OEM quality.
ha ha whatever you say shlongor...... i wont get in a war with you but i know lots of people with 7,8, or 9 hundred horsepower daily drivers..... and there are people on here with them as well, also you dont use that 600 all the time... i will run low boost and make 400-450 daily and 600-650 when i turn it up and want to have some fun.