I have a 56 T-Bird with a 57 intake manifold and 1957 Holley carb on it. I have the PCV fitting to replace the road draft tube in the valley pan. I have read that you don't want to run the hose from the PCV into the only fitting on the back of the intake manifold. It makes the rear cylinders run lean. Also that the thin spacers with the hose barb that they sell are not very well made, and there is little room above the air cleaner for a thick one that you can tap. With all that said has anyone drilled and tapped the intake manifold in the front or back to get vacuum for the PCV? Is there a place on the Holley carb that can be drilled and tapped? Someone must have tried this by now.
I guess we’ve got to assume you’ve got an early model Holley, possibly a 57, with no PCV fitting on the carb. That right?
Later model carbs are more common here. If you don’t get an answer on a plate (and I under the problem with hood clearance) ask over on the Ford Barn or yblocksforever. Yblocksforever is the best bet, but if you’re not a member you need to contact Eaton Balancing at https://www.eatonbalancing.com/2001/03/20/contact-us/ Ted will sign you up, it’s how they filter the spamming out.
Even tho mine is on a dual quad intake the 90* fitting is directly tapped into the intake between the carbs none run lean. In the early years there were 1/2” plates added under the carbs with the fitting on the rear AND all the GM fittings at the rear of the factory 4 barrel carbs and passages to the rear barrels only and I have never heard of rear cylinder running lean. Actually all the blowby PCV air is shared even in a dual plane manifold because of these passages at the rear of 4 barrels.
I have a 1/4" insulator under the carb and have 1/4" clearance from the top of the air cleaner to the underside of the hood. So no plate under the carb for me.
The Jalopy Journal
