Not really just got away from spending money and time with the mefi1 system , carb is easier to tune when other parts are upgraded at least for me

The cam you listed is just a stock 500efi cam.
I have run the 168731(very similar) in a 454/525SC which is 7.5 CR static and it worked well. I'd go one size bigger for a performance 502.

The melonized gears are all over ebay. 2 questions. Which dia goes with which distributor. And since the ZZ and HO cams are steel cores, what about the other factory GM cams-distributor gears? Since GM got tired of wiped cam lobes, wouldn't ALL of their cams be steel, therefore all distrib gears hardened?

I've done this with a GM truck ECU and it seemed to work well. Verified timing with the scanner and timing light. No IAC or TPS hooked up. No Codes.

Jeff

Sounds like a plan I just remove my old gear and it Mike's out to 17/64. I'm going to stick with this zz 502 cam since it is probably already installed in the engine and my head builder has already set up the springs for that cam ,maybe I should've done some homework earlier. I will post updates or ask questions as they become relevant thank you everybody for the help.

I have the ZZ502 cam also and have been happy with the DUI ignition, although I never switched out the gear so I’ll look into that. I plan on switching to a 731 cam this winter though just to step away from the reversion issues, and should be similar enough to use the existing valve train.

One note with the DUI ignition is that you need a dedicated minimum 12g power source. I ran a new 12g wire instead of using the EFI harness and the change in performance was stupid different. You will also have to rewire the tether kill switch too to cut the ignition.

Thanks

I have done this as well, DUI dist are nice pieces, I have had great success using the H/P HEI's from summit, I get the vac advance eliminator and use the petronix rev limiter, used the gear that came with the dist on both the std cam and as well when swapped in a 500HP cam... if you go with came change go with a single plan intake

i am a little leary about those from ebay,i buy them from summit.

Summit racing equipment in Ohio. Pretty sure there is s .491 Dia and .500 Diameter. Mine are .491. Push the pin out and measure shaft with caliper. If you don' have caliper, go to someplace like autozone. They have them under counter. Or just buy a cheap set. Mallory, msd, ECT. You will have to make sure you have proper clearance between housing wear plate and gear face. .010 is good. My gear was tight against housing, you have assemble measure with feeler gage then take material off of gear face until it's right . Most gears will be tight against housing wear plate. Just call summit hit 2 for help questions wih parts