PCV and valve cover info needed

Still had problems so it went back to the carb guy, after talking with him, he realized I did not have a exhaust heat riser tube. Da so that is where he said my vac leak is, he pluged it and I pick it up Sat. Car guys don't have a clue about boats.

PVC was the problem idle is fixed now I have to go after the same hesitation problem out of the hole I had last year b4 I had the carb rebuilt.

Ok re-installed the PVC valve and re-adjusted the carb screws back. Still won't hold idle under 1200. Looking for other leaks tonight, I'll keep ya posted...

Ok I am having idle issues. I just put on some killer Ford racing valve covers and a Edlbrock performer manifold and a rebuilt 4160 Ford blue carb on my 78SN. It looks sweet, I did not re-use my PVC valve, but I did plum the breather vent to the carb spacer plate at the rear. My idle won't hold under 1200 rpm and I can't think that my carb guy screwed up the float adjustment. Do you that not having the PVC valve there is causing my idle problems, or do I go after the float adj?

Reminds me of the old days... We had a '56 Plymoth Belvedere (I think it was a 383). One valve cover had a sealed oil filler cap, the other had a 1" steel pipe that vented onto the ground.

No vacuum leaks on that baby!

Oh I will surely be re-visiting the timing just after I stab the new distributor. I'll carry the vacuum gauge and tach and timing light down to the lift and tweak away. And a can of carb cleaner and a shade tree stethescope (peice of fuel line stuck to ear) to check for vacuum leaks around the new plumbing.

I'll go take a look at the "donor" motor on my engine stand and see where the vacuum port goes in the intake. It's a common port that drives brake booster and vacuum accumulator cannister on automotive apps. Leaning out a cyl SHOULD not be a prob.

I was reading and researching and the PCV valve lets about 3 cfm through @ idle and around double that at cruise. With that said -- it's small vacuum leak and it is controlled, I assume that won't degrade idle nor driveablity. Unlike a bad gasket, cracked vacuum line or such.

You are basically correct; you HAVE introduce a big vacuum leak, but that is the correct way to plumb it.

Now, you will need to do some idle adjustments to your carb and possibly your timing also.

...and the breather goes to the spark arrestor.

1978 Commander 302 CCW w/ aftermarket (sleezy chrome) valve covers on my boat. On one side I have a PCV going into the flame arrestor (probably needs manifold (not ported) vacuum?) and the other side has a valve cover breather, one of the filtered kind. Sumabich stinks like buring oil and there is blowby coming out of the breather. I run the blower a LOT and I want to square this away.

Can somebody please tell me what goes where? A pic of the appropriate configuration would be much appreciated. I'll be installing a new distributor Wed or Thu and want to fix this at the same time.

thanks,
/s/sMTM