12 bolt shoppers beware !!!!!!

Home: Goto Homepage.
Subscribed: See all threads you’ve posted in or started.
Today's Posts: Posts made today. Bold = unread.
New Posts: Shows all unread posts since last visit.
New Thread: Newest threads by creation time.

**PeteLeathersac** · #1 04-01-2006, 12:16 AM

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 · #2 04-01-2006, 06:30 AM

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]

Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars.