I'm in the middle of putting 317 heads on my 5.3 and changing the cam to the 265 extreme from comp cams. Do I need different pushrods? I also changed the valve springs to the yellow GMPP ones.

 

Please tell me your running forced induction of some kind!! Putting these heads on a 5.3 will decrease yoour compression among other things, not beneficial for power here.

 

the valves are going to be very close to the side walls of your bore, 5.3 bore 3.77, 5.7 bore 3.9, and going from 62cc heads to 72cc heads going to put you around 8.5 to 8.8 compression, great for forced induction bad for N/A.

 

Shrouding is another issue, like Kevin explained above.

 

yeah i'm running a novi 1000. What do you mean by shrouding? So will my stock rods fit?

 

Ah, ok man. I was scared there for a minute. Are the heads milled at all??

 

Nope stock except theyre getting a mild port job

 

I think you'll hate how much of a dog your truck will be with that low of a CR.

 

Any andwer on weather the stock pushrods will work?

 

Long as they arent milled yes. 7.4" is fine but I would push it to a 7.425" or 7.43".