13.5 to 1 compression. 340 filled block, 4" stroke. Cam was a comp .658 lift, duration at .050 = 275I 282E. Heads were cnc ported with that group buy that was here through SDSS. Gave us a best of 9.87 @ 137. Car wasn't legal so my dad was shifting at 6200 and running 10ohs. We turned it up a couple of times and pull it would!