Hey I'm selling a brand new set of Probe SRS pistons. I had the top of them coated to improve compression. And prevent detonation. They are 30 over and are 10 to 1 compression ratio. They will work with a 5.35 or 5.4 I or H beam connecting rod. And they come with a brand new pair of Performance Circle piston rings. They were made for a pair of twisted wedge Trick Flow heads. But will clear any aftermarket head. I paid $160 to get them coated. And I paid $489.95 for the pistons. And $139.95 for the piston ring. Again they new never used. All together I paid $790 for it all. I'm asking for $500 for them. They come complete with wrist pins and locks. Forged Probe SRS Piston-Ford 302-ft 1.175 Size .030 .912/-4.0cc.Forged Pistons. Perfect circle Preformance Piston rings size 4.000 + .030 1/16, 1/16, 3.0mm Plasma-Moly Ductile/Grey Iron THG / Low Tension CP20 These bad boys will make a 306 a 331 or a 347 short block.