4.6 PI heads on markIII shortblock
 

Hello, im new to the forums. just wanted to say hello. i have a 02 gt with lots of mods.bbk75 tb,bbk long tube with off road h pipe,stage II patriot heads, flow cat back,tko 500 tranny,cold air, custom tuned by texas hot rod.putting 269.7 rwhp 330 rwtq-------since those specs i have replaced the tired 165,000 mile short block with a fresh markvIII shortblock, therefore i have gained tons of compression i havent had time to get it dyno'd yet does any one have an idea of what kind of horse power i have gained since ive went from dished to flat top pistons. thanks for any input.