Ok so i've got most of my motor work done but now i have another question.....fuel. I want to put a fuel rail and bigger injectors on the car but didn't know how big to go with the injectors. Before i get into that, i'll give you some back ground on the motor to help. Its a bored out block to .25 with p30 pistons, micropolished crank, resised big end of rods, stage one cam shafts, valve springs, 4-2-1 header, skunk2 cam gears, skunk2 intake manifold, and polished exhaust side of the head. The motor will run around 11:1 compression. So, i was thinkin of injectors around 300-350cc but than came the problem with the throttle body....how big should that be?? 68? 70? and to top that all off what should i do about the computer so that the air to fuel ratio is mapped out of whack???? I need some help cause i'm all out of ideas !!! Thanks guys

 

go get it tuned...
that'll solve all your fuel ratio problems.

Your throttle body needs to be the same diameter as where it connects up to your intake manifold.

 

310s will be fine (anywhere in that range). For that setup you shouldnt go over a 64mm TB and a 62mm ITR TB would probably be best.

 

you'll need to convert to obd1 if you're already not. have your ecu socketed, chipped, and tuned with whatever ems your tuner prefers. a fuel rail wouldnt be needed but 310cc injectors should be adequate.