Thread: carberator problems?

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picked up a Chevy 350 for 4grand recently came with dyno sheet 390hp since the first time it fired it has run rich, rich enough to foul plugs. It has a 600 cfm qtf slayer carb, now, the float levels stay dead center had one test run, seems to run rich all the way through the circuits, at idle it acts like it loaded up till you rev it a couple times then it smooth's out for a few seconds. does this sound like power valve issue's, only thing I changed was to add a 1,1/2 spacer. It is under warranty but the truck isn't ready for the road yet. I'd just like to get an opinion on what could have went wrong, it runs rich even with the break vacuum opened. thanks

this was the carb that was dynode with the engine no mods were added after I got it home

the engine came from jms in Irwindale ca. 350 4bolt 40 over edelbrock alum. heads I don't have cam specs but its not stock but not wild either, I just don't get what happened from the dyno to the garage that would make it run so rich?

And last, if it was mounted, and dynoed, it probably wouldn't show up right off Witch condition are you referring to

all hoses are new, I had the transmission modulatr and vac advance crossed but correcting this made no diff

no, I meant ruptured valve or stock

What is your fuel pressure set at?

edelbrock mechanical between 5& 9

I was just reading about power valve failure due to backfire in hollys if this is true I have had some backfires

yes it belched ,and that seems like the next thing to check thanks

Originally Posted by craig akiyama

edelbrock mechanical between 5& 9

I had to install a regulator with my mechanical pump (same as yours), most carbs do not like more than 5-6 pounds max.