carb issues, I think....
Thread Starter
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Senior User
Joined: Aug 2002
Posts: 108
Likes: 0
carb issues, I think....
Ok, I fought my truck for almost 45 minutes tonight, and for the life of me, I can not get the darn thing to start and stay running. I just completed putting in a new cam shaft last weekend. I had it sitting and idling for almost 20 minutes last Sunday. Timing is dead on, and it idled great! Tonight, I go to start it up, and take it for a short off road test, and can't get it to start, and stay running. It will pop, maybe start and run for 2 seconds, and quit. It ran fine last weekend! Here is what I have...
400 punched .030 over & shaved deck
stock heads but have been shaved
.512 lift 292 duration cam
Edelbrock streetmaster 4bbl (single plane) intake
Holley 650 4bbl carb with #72 jets (only 2 years old)
Stock ignition
I have always had a hard time getting it started with a 4bbl on it, but tonight was the worst ever! Few questions for all of you...
1. The stock 2bbl carb & intake had a spacer... should I be running one with the above combination?
2. Has anyone had any exerience with the Edelbrock streetmast intake? Are they junk?
3. What the heck could be going on here!
400 punched .030 over & shaved deck
stock heads but have been shaved
.512 lift 292 duration cam
Edelbrock streetmaster 4bbl (single plane) intake
Holley 650 4bbl carb with #72 jets (only 2 years old)
Stock ignition
I have always had a hard time getting it started with a 4bbl on it, but tonight was the worst ever! Few questions for all of you...
1. The stock 2bbl carb & intake had a spacer... should I be running one with the above combination?
2. Has anyone had any exerience with the Edelbrock streetmast intake? Are they junk?
3. What the heck could be going on here!
Thread Starter
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Senior User
Joined: Aug 2002
Posts: 108
Likes: 0
I checked that and many other things. I was just thinking though, over the past few years, I have replaced the ignition coil 4 times. Starting to wonder if the coil may have taken a crap on me. But my experiece with coils is either they work, or they don't work, no in between... It will pop, maybe start for two seconds, then quit. Like I said before, it has always been cold blooded since I put on the 4bbl carb & intake, just not this damn bad.
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
May be time to dump the Duraspark and go with Mallory or some other good after market system. I have never had any luck troubleshooting duraspark. But it sounds like ignition or timing. The cold starting hard could have been from weak spark and is flooding.
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
Big cams need ta be broke in with just one valve spring as most have two. Ya may have lost a lobe or worse, I broke a few before I learned that lol
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Senior User
Joined: Jul 2007
Posts: 108
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Not to keen on this kinda stuff but i have heard of when replacing the cam that u can end up loosing vacuum, if the came is too large. Not sure if im starting farts on fire here but shoot just throwing ideas... bigger booster?
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