Did gm upgrade rod bolts in zz4?
 

Hi I'm getting ready to build an engine and was looking to use zz4 shortblock but I was wondering if gm upgraded the rod bolts in that engine as that's the weakest link in the sbc bottom end. Also if they didnt and I replace them with arp rod bolts would I have to have the rods resized? looking to spin it to 6,500 max.
Thanks

Re: Did gm upgrade rod bolts in zz4?
 

I can't tell you what type of rod bolts are in it, but no, it would be a bad idea to change the bolt type without resizing the rods.