Brad Brooks works his majic on shredder for a few hours saturday. straight 93 octane results were not so hot. this spearco core is not very good for straight pump. it does not remove enough heat. and heat soaked too easy. Best was about 380whp at 20 psi. when intake temps rose above 120 knock reared its head. turning on the meth and intake temps dropped to 65. now thats more like it. made 409 at 20psi. then 447 at 24psi. 475 at 26psi. 507 at 28psi. and finally 524 at 30psi. then the mishap gremlin jumped in the game. the cam/crank connector popped off and caused a massive backfire. unfortunately the head lifted and blew the head gasket. so much for stock 7 bolt head studs. I really wanted to push them harder. shame the connector popped off. I dont want to risk trying them again. so we will say the stock head studs are good for 500whp or better.