Ok I am new to this type of help but I think I've found a home in my home!! A little about me I have had 12 mustangs in 10 years and now have a 92lx 5.0(FOR SALE) 2 90 GT's one parts car 1 my pride and joy, an 84 GT turbo convertable and a 92 5.0 T-bird(technically a fox body sort of) Well I had a few thiefs help themselves to my 90 GT one winter night a few years back. They stole my AFR 165's and all the top end components that were installed including 24lbs inj. 75mm Pro M meter 70mmedel. throttle bod adj fuel reg and my GT-40 intake, oh and my 1.7 roller rockers. The car sat dormant till thismonth. I have bought all stolen items back FINALLY and went larger on all of them! The only difference was I bought a set of DOOE 1970 351W heads that had been redone recently with 2.02 X 1.6 valves and adjustable stud mount comp cams roller rockers along with guide plates. The thing is the bottom end of this car is ORIGINAL 1990 GT pistons. The thiefs didn't take the cam and I plan to use it. A F303 .512lift and 288dur. 228@.050.... Does anyone know if piston contact is a DEFINATE or is it possible? I have a set of 86 GT flat tops I had professionally relieved to run a .542 cam back in 2001. These pistons have been sitting for a bit but are useable. If the 90 pisons are a no-no how bout the notched 86 flats?? Or should I find aftermarket pistons? I am on a tight budget so I need to get her rolling but I haven't a lot of extra money. Any help or past experiences will be greatly appreciated and I hope I am welcomed here in the group. Thanks ADAM!