Originally Posted by redfish211
Looks like I will pass this deal up. I was attempting to find a winter project build.. but I will keep looking on craigs. He did say the heads were good.. so I might snatch those up for a good deal.
Just be sure the casting number is either 10239906 (the 906 casting has one large single hump on the end of the head) or 12558062 (the 062 casting has 3 small humps, aka "sawtooth" on the end of the head).
906 on Left, 062 on Right
Beware of the L30 305 Vortec head!
There are other heads to watch out for as well. One is the "swirl port" head like the c/n 14102193. Most any of the open chamber SBC heads are not considered to be high performance, and even the fuelie heads are now basically obsolete.