The PCV Valve will take away about 2 inches of mercury (no more than that) all by itself. That is if you are using a V-237 valve. Its as low as is practical for that engine. I think you are asking way too much of that little engine and you will need to add something else to get your wipers to work. THAT is where you will notice a problem.
Deve, I was following your PCV work and bought the V-178 before your testing concluded on the V-237!
Based on all the replies here, I may just go to elec wipers after all - seems much easier (and more effective) than a reservoir system. I haven't checked out my wiper motor yet - it wasn't connected when I bought the truck so it may be junk anyway.
Having said that, would it still make sense to run my power brake booster through the fuel/vacuum pump to essentially offset the draw of the new PCV?
