holley 4011
Thread Starter
Junior Member
Joined: Aug 2013
Posts: 13
Likes: 0
From: masontown pa.
holley 4011
I've got a spread bore holley on a square bore intake the problem is when at idle it's trying to suck my pcv valve hose shut. if I block off the hose it shuts the engine down. any idea would be helpful
Senior Member
Joined: Mar 2013
Posts: 2,106
Likes: 235
From: Fullerton, CA
Try using a different manifold port for the pcv valve and using reinforced fuel hose that won't collapse under suction. There should be no more than 22 pounds of vacuum on your manifold at any location.