I have a set of Supertech 83.5mm 8.6:1 forged pistons that have come out my old built motor. These pistons only have 500 miles of drive time on them. These pistons were inspected, disassembled, and washed in the parts cleaner at Cardelli Motorsports machine shop in San Mateo, CA. The machinist there has stated that these pistons are in great shape and completely fine for reuse. I'm rebuilding the motor and going with a larger bore at a different CR this time around, so I will not be needing these any longer. This sale includes the pistons, wrist pins, and wrist pin retainer clips.

The Supertech part number for these pistons are P4-MA8350-N4 and the full spec sheet can be found here on their website: https://www.supertechperformance.com...4-p4-ma8350-n4

These pistons are located in Redwood City, CA in the SF Bay Area for local pickup or can be shipped via USPS Priority for $13.20.

 

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Can i ask what size and CR are you going to switch to and why? Just curious. I am about to put 84mm 8.6 in my car. Did you find 8.6 to be too low?

 

I'm switching to a different block that was already bored to 83.5mm by a previous owner. I was hoping that I'd just be able to drop these into the new block, but my machinist measured the new block and it looks like there'll be slightly too much piston to wall clearance from the previous bore. To get around this, I just decided to jump up to 84mm and rebore the block a half larger. I'm just stepping slightly up to 9:1 on the new pistons. I don't foresee myself going crazy enough on the boost to benefit from that extra .4, and since I was switching pistons anyway, I figured I'd add a little bit of drive down low before boost. Honestly I'm not sure that I'll be able to tell the difference. If I was able to reuse the pistons, I would've had no problem staying at 8.6:1.