The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

felm0001 · 11-08-2012, 04:09 PM

carb was a bit wet... so I fiddled a bit with the mixture and found that the pop and bang was happening once I was up trying to maintain high rpm, throttling up was fine, but at high rpm I think it is getting too much advance. I tried adjusting the distributor while at 1000-1500 rpm to see if I could get it running smoothly and I could, but once I brought it back down I had retarded the initial timing pretty far. something might have high fived the valve cover... ran fine after I set the timing back to 8deg adv so I am going to ignore that for now...

And everything still runs smooth with the vacuum can disconnected.

I am connecting the vac advance up to the carb where the old points distributor vac advance was connected. Maybe there is something up with my vacuum source?

11-08-2012, 04:09 PM	#11
felm0001 Registered User Join Date: Sep 2012 Location: GA Posts: 8	Re: 250 HEI Timing, vacuum advance question carb was a bit wet... so I fiddled a bit with the mixture and found that the pop and bang was happening once I was up trying to maintain high rpm, throttling up was fine, but at high rpm I think it is getting too much advance. I tried adjusting the distributor while at 1000-1500 rpm to see if I could get it running smoothly and I could, but once I brought it back down I had retarded the initial timing pretty far. something might have high fived the valve cover... ran fine after I set the timing back to 8deg adv so I am going to ignore that for now... And everything still runs smooth with the vacuum can disconnected. I am connecting the vac advance up to the carb where the old points distributor vac advance was connected. Maybe there is something up with my vacuum source? Last edited by felm0001; 11-08-2012 at 04:28 PM.