New here, just bought '90 ZR-1 - ZR-1 Net Registry Forums

A26B · 04-27-2009

Looks like the broken cam chain has some rollers that are badly worn and at least a couple that are missing. With roller(s) missing the chain pitch no longer matches the sprocket pitch which probably precipitated the link breaking. You should have several pieces of broken rollers in the pan also.

Hard to say whether a sprocket on the drivers side chain went bad first or the chain did. Regardless of what failed first, all of the sprockets will also have to be replaced too, as you already know.

Oil pump has a few battle scars, but nothing bad. Good news is no damage to the block.

Will keep my fingers crossed for minimal damage when you get the head off. Not too bad so far!

04-27-2009	#16
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: New here, just bought '90 ZR-1 Looks like the broken cam chain has some rollers that are badly worn and at least a couple that are missing. With roller(s) missing the chain pitch no longer matches the sprocket pitch which probably precipitated the link breaking. You should have several pieces of broken rollers in the pan also. Hard to say whether a sprocket on the drivers side chain went bad first or the chain did. Regardless of what failed first, all of the sprockets will also have to be replaced too, as you already know. Oil pump has a few battle scars, but nothing bad. Good news is no damage to the block. Will keep my fingers crossed for minimal damage when you get the head off. Not too bad so far! __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.