Quote Originally Posted by Thorwon View Post
I have both of those and that is what they measure with the deg wheel I have.

I think the 6x trigger wheel I make for the distributor will need to be the same.

I have also thought about just milling the harmonic balancer. It has a ridge around the front of it.
4.0l jeep balancer.jpg
For a nearly perfect 100% CKP/CMP signal accuracy, maybe use the harmonic balancer for both CMP and CKP? Maybe the outer ring / larger ring the CMP? Maybe use the inner ring / smaller diameter ring for 3x CKP? If I'm thinking my engine math correctly, then maybe machine two 87.5 degrees segments (175 degrees CMP trigger wheel divided by two) from the outer ring? Custom CKP - CMP brackets required. Custom balancing for the I6 Harmonic Balancer required. The BBC 8.1 Liter CKP sensor will read the Harmonic Balancer modified 175 / 185 degrees.

Link for the BBC 8.1 liter Timing chain and gear set: https://www.carid.com/melling/engine...3-4sr50sc.html

dave w