I am looking to replace both the stock Main and Head bolts with new Grade 8 bolts (don't want to use studs) on my C2AE block build. When I measure the length of the 1/2" main bolts, they are 2.900" long. Can I use new 3.000" long bolts without redrilling?

Also, the shorter 2" head bolts actually measure 2.125 but I assume this may be due to stretch over the years, so I plan on using new 2.000 long bolts and call it good. The longest head bolts I measured at 4.300". I can't find any 4.250" long head bolts, would 4.500" long bolts be okay without redrilling? I heard that the C2AE blocks were drilled deeper so I think I will be okay with this plan.

Thanks,

Rono

  Ron Lane,  Meridian, ID