Where can I find some? Dad wants a 347 in his Fairmont...and being that it's alcohol injected, I figure the best option is going with a dome piston around 13:1...maybe more if I can find anything that'll work. Heads are 60cc.
Probe has a set part number 10480. This is an SRS piston with a 9cc dome and will produce 12.5:1 compression with a 60cc chamber but uses a .927 pin. They also have one that uses a .912 pin but the 3mm oil ring is hard to find.
Looks like the Probes are going to be the choice. Apparently there isn't much of a demand for a set of high(er) compression pistons for a 347. Shelf stock and inexpensive pistons are hard to come by! Pretty much everyone I've used in the past (JE, SRP, Wiseco, Mahle, few others) want me to buy custom pi$tons. We'll figure something out.
I'm running a set of KB forged domes and their holding up good so far. I think they cost in the mid 400s. We calculated that they were around 12.5 to 1 because they were downhole around .010 or so. I did not re-deck block.
P.S. I spent an extra $100.00 on lightweight wrist pins hoping to avoid re-bal, but ended up re-balancing anyway, but 1/2 the normal cost. By the way, the first set I got from them looked like everybody on this forum drop kicked em across their shops. Second set was perfect.
<font size=-1>[ This Message was edited by: 63SportsCoupe on 4/11/06 10:26am ]</font>
I won't use another set of KB's. Had 2 too many bad experiences with them...and have had 3 sets now. Next time, SRP will get the call. Either that or Mahle. Mahle pistons aren't much more...and they come WITH rings. Last set I bought was just under $400 for my 415" windsor.
Haven't encountered any problems with Keith Black pistons but we certainly had lots of problems with Probe pistons...as noted above..they looked like they were kicked around the shop. My machinist turned down the third set after he discovered that the pin bores were out of whack...food for thought. Maybe other forum members can comment further on the Probes.
I'm currently running a set of probes with no installation issues and "knock on wood" no operating issues (1 season 60 1/4 runs, 20 dyno pulls and about 400 street miles). Its about a 12.8:1 motor.......
1991 LX Mustang 347 C4 combo 11's with the AC on.
1984 Mustang GT 460, Powerglide "Still putting it together" hoping for 9's !!
<font size=-1>[ This Message was edited by: dfree383 on 4/12/06 9:51pm ]</font>