Thx guys i appreicate the help and its a stock rebuilt motor and i have a walbro in tank 255 HP...so im guessing 7 psi max?!?!i thought that with the 30lb injectors i would be able to boost atleast 9psi??? am i wrong? thx again to everyone for there input...also besides upgrading the internals wat else can i do to boost higher?? or is internals the only route for more boost? thx once again Steve