ballajb

is there anyone else running this combo of gt40 heads with f303 cam? if so what length pushrods did you go with?

mjr46

most likely stock 6.250 will work, but you'll have to mark the tips of the valvestems and with two converted roller lifters run/check the pattern they leave and based on the mark it leaves you'll know to go shorter or longer, there is no put it in and go the proper way is to get a length checker and check for length needed

NotchAbove

What type of rockers ?

PJC Racing

You should measure for proper pushrod length.

ballajb

1.6 crane cam stud mounted