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Old June 15th, 2017, 07:40 PM
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Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
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Default Re: Which came first, the carb or the distributor?

Quote:
Originally Posted by Dano64 View Post
Hi.

So my new 64 with a 250 was a little tricky to start. I figure out that the accelerator pump wasn't working properly, but it seems to work ok if I push the gas down more slowly to wet the carb.

I think she's running rich and that the timing or points may be off. I pulled the cap to look around and the rotor/cap had some corrosion. Cleaned that off and went for a drive before futzing with anything else.

It seemed a bit better and I moved on to timing. The timing notches on the balancer are showing up at about the 12 o'clock position and the timing marks that show TDC and advance are at about 2 o'clock....off by inches! So... assuming the balancer is keyed do I have a balancer from the wrong truck? When I get to timing, I think I need to manually find TDC and time from there. ya?

My question is logical sequence of checking points / timing / carb tuning. And I'm a little nervous about that last one so I"m hoping carb is last, logically.

Help appreciated. Photos coming soon.
First thing is first....Need to verify Top Dead Center with the timing marks. Remove the spark plug and manually crank the engine until the piston is at the top....I stick a screw driver down the hole and the piston will push the screw driver back out until it's at tdc. Once at tdc check the mark on the balancer to see if it's at the 0 mark on the timing tab. If it Is then you can move on...if it isn't then it's more than likely time for a new balancer.

If tdc is verified and the balancer is fine, move onto the distributor. Check to make sure that all plug wires are routed correctly: 1-5-3-6-2-4 Check the wires going Clockwise around the dizzy. Also check to make sure that at TDC the rotor is pointing at the number 1 terminal or very close to it. New points and a condenser are cheap insurance. I would get a set. Cleaning will help, but a new set that is gapped correctly will help all the more. Once all that is verified, fire the engine and check timing with a light. I'd say start with 10 degrees initial. From all the reading I've done these engines tend to like more advance. My 292 made the most power at 14 initial. lol

The carb is no doubt due for at least a rebuild. The accelerator pump is shot if you don't see a good squirt of fuel down the throat of the carb every time you hit the throttle. I'd invest in a kit and clean the carb up nicely.

Should make for a good runner! I'd also look into new plugs, wires, coil, cap, rotor as well. Also change the oil if you haven't already. Hope some of this helps.
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