went to jlp today for a dyno tune previous mods are in sig. 400hp 516 tq . i added an apten ported blower,acccufab t/b, phenolic spacer and 2.8 upper i put down 449hp 534 tq. johnny said it may be time to upgrade fuel pumps because at the end of the pull the truck was leaning out to about 12.5 a/f. anyone else upgrade there pumps in the hp range im in?? how safe are these numbers on a stock block?? should i maybe remove the upper pulley after all??

 

those are real good numbers but be careful cause 425 hp to the rear wheels is where they start to draw the line with a stock block. Anything after 425 is just like rolling the dice.