Unless your car is 93 or newer your pistons are forged stock.also in 90 they switched to moly rings witch is good.up to 92 they say the stock short block is safe up to 500 horse and can handle bursts of more a stud girtle will usually get you in the neiborhood of 600 depending on a multitude of varibles.I pearsonally know of two guys that are running almost identical setups using kenn bell blowers and they are bolth just over 500 horse at the crank (Calculated from RW horse dyno measurements).with 325 rw horse you should be running 12's mabie its time for a seprate set of "stickies" for the track.Also exgmguy sorry but if you have 500 horse at the crank you should be running alot faster than 11.8 at 123.
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91GT Flowmaster 2 chambers,off road H pipe,mac equalength headers,F303 cam,high lift valve springs ,svo 1.6 roller rockers,19*timing,410's,BBK cold air kit,hurst shifter, Pullys,World class T5 MSD 6al box. Ran 13.5@101 with stock headers and air box.
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