ok i got my truck dynoed friday and here is the result. 449hp 534 tq. johnny was telling me that i need may need to upgrade to large fuel pumps. anyone else done this with my similar numbers?? the truck was starting to lean out in the higher rpms to around 12.5. is that unsafe?? should i go with larger pumps?? id like my truck to run as safe as possible because im not trying to buy a new motor. so should i go with the pumps?? or should i maybe drop the upper pulley?? if you think pumps whats the best place to buy them from for the best price?? i believe he said he sells them for 250 or something. thanks!

 

going to a larger upper pulley and re-dyno would be the cheaper route.

12.5 is too lean. A go pedal stomp in cold weather could be catestrophic!

Bob

 

what if i kept the upper pulley and did the pumps would that be safe??

 

I would say you need injectors more than a fuel pump. I am running way over your power(aobut 500rwhp), and am running the stock fuel pumps. But, I am using larger 50 pound injectors. I can make mine as rich as I want it with the stock pumps and 50# injectors.