Engine block reads AHCMI52639. Door post reads 2HRD2707.

Transmission reads C cong (?)
5 C210
GM
591665

The firewall doesn't have the H embossment, it's flat. Signifying a 49(?). Any idea what's going on here? This always confused me, truck appears all original.

According to this website: it says it should be a 235. Unless I'm just reading it wrong. Actually, I think I am interpreting this wrong, because on another part of the page, it says AHCM is 3600 216 engine.

If I do have a 216, the tick is common? It sort of sounds like a wind up toy. IF the lifters are out of whack, does it hurt to drive the truck in the meantime?

Thanks guys!!

Last edited by 50chvytrk; 08/12/2012 2:37 PM.