Cascade Crew

83Z28BlackBetty · Posted: Tue Jul 01, 2008 10:24 pm Post subject: carb help...running rich again

So my engine has been running rough lately and seems to be getting worse each day. It smells really rich...again

I'm thinking power-valve since i've heard that Holley carbs are notorious for blowing the power valves after a backfire, and i had a backfire last weekend.

~JAKE

blue89 · Posted: Wed Jul 02, 2008 7:31 am Post subject:

I've seen a power valve blowout trick to prevent that. I'll have to see where it is. You basically just plug a hole and you're done.

What holley do you have? I have a 650 DP at home waiting for a project to get started...

83Z28BlackBetty · Posted: Wed Jul 02, 2008 7:42 am Post subject:

cool, i think its a performance 600 cfm

~JAKE

blue89 · Posted: Wed Jul 02, 2008 9:05 am Post subject:

http://www.hangar18fabrication.com/blowthru.html

blue89 · Posted: Wed Jul 02, 2008 2:09 pm Post subject:

I just read a deal from holley that says every carb from 92+ has that valve check ball in there.

Reference:
http://holley.com/data/TechService/Technical/Carburetor%20Tech%20Info.pdf

chevymad · Posted: Wed Jul 02, 2008 4:32 pm Post subject:

Those don't always work though either. They do help. May I suggest you get an actual Holley brand power valve too.. the napa ones i've tried seem to blow way easy.

83Z28BlackBetty · Posted: Wed Jul 02, 2008 10:13 pm Post subject:

well i got a new holley PV installed today. It seems to be running better so i think that means i've fixed it. I'll be taking a trip to visit my girlfriend this weekend so that will be the true test.

I also managed to break the throttle return spring in the process. easy fix though.

~JAKE

PS I also found out the the holley brand power valve has a lifetime warranty on it, so if i blow it again i shouldn't have to buy a new one. Smile