69 Z28 Distributor Hold Down clamp

[1968 Z28]

So from Jerry's observations, it would seem that we at least have all 67's, 68's and early 69's using the wire clamp, then changing to the stamped steel clamp, with the changeover possibly somewhere early 69.

My 1968 07c Z28 has the stamped steel.

[Charley]

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#

[My68SS]

]My 1968 07c Z28 has the stamped steel.

Interesting...the only theory I can think of to make this fit with Jerry@chp's info is that the Z SSDI road tested was an even earlier build with the wire clamp.
There are some unknown variables of course. We don't know exactly when the SSDI road test took place, only that it was before Nov 68 and the build date of the tested 68 Z is also unknown.

[My68SS]

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#

JohnZ, do you know the assembly procedure for motors with Ali intake? Was the intake fitted by the engine plant, or was the whole valley area covered off and the intake and dizzy fitted later on the engine dress line?

[JohnZ]

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#

JohnZ, do you know the assembly procedure for motors with Ali intake? Was the intake fitted by the engine plant, or was the whole valley area covered off and the intake and dizzy fitted later on the engine dress line?

Silver overspray is typically found on Flint engines with aluminum intake manifolds, as there was a silver touch-up type process where silver was sprayed on the exposed cylinder head area between the intake manifold and the valve cover so that area wouldn't rust before the car was sold; during the initial orange painting, the aluminum intake manifold and aluminum valve covers were masked with a vacuum-formed plastic shield, so little or no orange paint got on that area, which would rust quickly without additional painting. All intake manifolds and distributors were installed at the engine plants. We see a lot of this silver overspray on Corvette engines, as most of them had aluminum intakes and valve covers.

[x77-69z28]

leave it to john to come up with the right answer!