I have a 2000 chevy with a 6.0 in it. It had the iron heads on it and I just put some 317's on it and my pushrods seem to be a little bit too long, it also has an LS6 cam in it which was already in it. Does anybody know if there's a difference in the head design? aside from valve stem seals they seem to be designed the same to me

 

your sure the pushrods are to long?
the ls6 cam #5308 that has .551 lift has a .025 smaller base circle
Cant be that much diff in heads
My 5.3 with .040 shaved heads and ls6 cam runs stock pushrods..

 

You need to measure for the proper length push rods.