12 bolt shoppers beware !!!!!!

[Jim Ferron]

Actually my buddy has the Dana in his Nova...I thought it was worth like $800...he thinks it's worth $1300. It has a spool in it so I'll have the added expense of a posi unit..so I figure 'screw that',I'd have close to $1800 in it...now I'm looking for a 12 bolt.[real one!]

4:11 would be nice. I've a rock crusher in the attic for 30 years.. and I'll build a 496 [454 w/.250 stroke +.060 bore] or a 540 if I can find a used block ['cause I'm thrifty!].
I have a set of ZL-1 heads..dog dishes / Cragar SS maybe Redlines...rubber mat..so it would look day 2...

[PeteLeathersac]

Jim, sounds great on all of the above! . Any Chevy post car w/ an L89 stick and dog dish caps is sano-wicked! . I sure hope you're keeping the bench? . Care to try a crankcase full of that dangerous lubricant? .
~ Pete

[Jim Ferron]

OK Here's the answer...Pontiacs had two styles of valves covers...the 389 style, '66 and older, you know the ones, they didn't have squared shoulders, they fit 326-389-421...and 67 and newer style that fit 350-400-428-455.

They both had the same bolt pattern but the 66 and older sat about an 1/8 lower on the head.

If you put a 389 valve cover on a 455 engine the rockers just hit in the sections of the valve covers that aren't 'squared' off. An extra set of gasket cures that ill. So plenty of 65 and 66 GTO's have 455 engines in 'em and you'd never know except look for two sets of valve cover gaskets...[or now I guess everbody just memorizes the casting numbers]