FYI: SBC damper timing mark locations

[Jack]

I’ve seen this questioned & wondered myself ... compiled this from data @ Superior Chevrolet of Merriam, KS.

This does not refer to modern-era LT1, LT4, ZR1 or other sbc that have a damper that bolts to a hub.

SBC harmonic balancer/damper timing mark locations:

1968 & earlier timing mark is 2° before keyway center line.

1969 & later timing mark is 10° before keyway center line.

JACK:gap

 

[JohnZ]

And the fun part is that lots of folks don't know this, and use the wrong timing cover, then can't understand why they can't set their timing (pre-69 balancer with post-'69 timing cover and vice versa - see it all the time!) - posts are usually titled "Why can't I set my timing?"

 

[Jack]

And the fun part is that lots of folks don't know this, and use the wrong timing cover, then can't understand why they can't set their timing (pre-69 balancer with post-'69 timing cover and vice versa - see it all the time!) - posts are usually titled "Why can't I set my timing?"

;stupid Yep ... I see a lotta exactly what you id'd (wrong tab-damper combo) ... that's why I thought this info might help. Annoying thing about this 8° difference ... it's close enough that it'll run ... but crappy ... root cause easily overlooked.
JACK:gap