im trying to time my motor...but timing keeps changing on its own!!!

[76zimmer]

well, it's an 83 350 with a mild cam/holley double pumper/long tube headers/HEI dist/Turbo400 and it was dieseling every once and again, but now it's not. how would i know if the chain had slop in it??? the truck runs ok, but im only getting about 6MPG and everyone tells me the timing is the problem. oh yeah, and when it's cold...it takes like 5 or 6 minutes to get it idling ok.


also...the vac advance is hooked to ported vac on my carb. if that matters.

That double pumper might not be the best thing for mileage either, and I would think a vac sec. 600 would work best for your application.

 

[goldwing2000]

It would be kinda hard to get true TDC (piston)with a head on wouldn't it?

Well, you're not going to get it accurate to .001" but you can get it pretty dang close. Close enough to know if the balancer is spun, anyway.

 

[01maroonz71]

i have a brand new edelbrock performer 650cfm with vac secondaries and electric choke i was gonna put on my mud truck...should i swap these carbs????? i could put that on my DD(truck in question) and put the double pumper on the mud truck