HEI distributor tuning problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WadmalawJoe · 03-10-2013, 06:06 PM

Alright I'm ready to give up.
I put a new GM hei dist in and I still have the problem. So its something I'm doing.
With the advance unplugged and port capped I have that intial timing set at 12 degrees ahead. When I plug in the advance it jumps to 30 ahead. So a 18 degree jump.
I have adjusted the advance can all the way in and I'm still getting the detonation sound at 50-55 MPH.
I switched to a ported vacuum and it pings like heck so its back on full vacuum.
I haven't gotten a dial back timing light yet, frankly I can barely use a regular timing light it seems. I do have a timing tape on the balancer.
What am I doing wrong and/or what do I need to do?
Thanks
Posted via Mobile Device

03-10-2013, 06:06 PM	#12
WadmalawJoe Registered User Join Date: Oct 2012 Location: Ravenel SC Posts: 317	Re: HEI distributor tuning problem Alright I'm ready to give up. I put a new GM hei dist in and I still have the problem. So its something I'm doing. With the advance unplugged and port capped I have that intial timing set at 12 degrees ahead. When I plug in the advance it jumps to 30 ahead. So a 18 degree jump. I have adjusted the advance can all the way in and I'm still getting the detonation sound at 50-55 MPH. I switched to a ported vacuum and it pings like heck so its back on full vacuum. I haven't gotten a dial back timing light yet, frankly I can barely use a regular timing light it seems. I do have a timing tape on the balancer. What am I doing wrong and/or what do I need to do? Thanks Posted via Mobile Device __________________ Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!!



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