Mk3, I have a set of slightly larger than stock ROSS forged pistons, coated with thermal barrier on top, moly on the skirts and thermal dispersant on the underside that were used for less than 15 min. (Bad mistake on my part, and the engine started, and ran, and then died quickly as the bearings were wiped out.)
I pulled the motor apart, and there are slight, very slight, scratches on the skirts. The shop and I measured all of them, and none are any smaller measurement wise, but you can see the scratches. I have not yet re-coated the skirts, but would recoat them before selling, and belive that when re-coated, the scratches would be all but invisable, and dimensionally correct.
You might need to buy a new set of rings. They are less than 100.00 direct from ROSS. These pistons would fit the stock bore with some very minor clean up/honing. (Don't do the work untill the shop has the pistons, they need the exact measurements to match the bores to the slugs.) Set your clearance to no more than 4 thousands, or the ROSS pistons will slap when cold.
The pins are excellent, and I belive I have all the spiro locks too.
New these pistons are over 550.00, coatings would cost you another 250 or more, but I'll sell them for 400.00 if your interested. (Recoated on the skirts of course. And I'll split the shipping cost with you.)
Let me know if your interested. (BTW, I have some ARP rod bolts and some other parts if you need anything else. Just make me an offer.)
These coatings are extremely durable. IJ coated his ROSS pistons the exact same way, and I'm running another set in my stroker motor coated, and they have impressed me with how durable they are.
