[dv657172]

100% dedicated drag car

1965 GTO w/1968 Pontiac 400

Car has
- a stock valley pan with the PCV fitting but no PCV installed currently
- a Torker II intake with the fitting at the back of the intake plugged currently
- a Holley 4150 DP with the fitting at the back of the carb (for a PCV hose) below the throttle plate currently open (i.e. no plug)

I have installed a Moroso Crankcase/Header Evac system (MOR-25900) which runs to the header extensions

Cars has run ok in this configuration but it effectively does have a big vacuum at base of carb where PCV is supposed to be connected

Should I run a PCV? Doesn't doing so effectively add dirty combustion gasses into a clean incoming air/fuel mixture?

Or should I just plug the PCV fitting at the back of the carb and try to adjust carb to run with it plugged and cover hole in valley pan

[leeklm]

Not sure what "optimum" looks like, but I run a ~640hp setup with stock valley pan and pcv routed to base of carb. All works well, including dyno runs with same pcv configuration.

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[Don 79 TA]

Vacuum pump........
with a sealed up, or shall i say as best sealed up engine as you can
I grow more fond of them all the time, next build i want to try low tension rings to get a better effect from the pump
GZ pump with Butlers brackets, quick simple and effective install

[dv657172]

Will probably have to go with leeklm's recommendation for this year but may have to add the GZ pump to the wish list for next season

Thanks guys for the advice

[leeklm]

On a side note, I also run crankcase evac valves connected to the header collector. poor man's vacuum pump, but have also run the engine with those disconnected without issue.

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[i82much]

Originally Posted by Don 79 TA

Vacuum pump........
with a sealed up, or shall i say as best sealed up engine as you can
I grow more fond of them all the time, next build i want to try low tension rings to get a better effect from the pump
GZ pump with Butlers brackets, quick simple and effective install

can you run those GZ pumps for extended street usage? would they last say 50k miles?

[Tim Corcoran]

I run a header evac system and use the Butler one piece sheet aluminum valley cover (no PCV). It's a 65 LeMans low 10 second car. Have been running like this for many years works fine lasts a long time.

[dv657172]

Thanks Tim
Love the pic with no hood!

[AG]

I run a header evac system plumbed to valve cover breathers which works great, never blow any smoke out the exhaust or generate crankcase pressure. I also use a solid PR cover without a PCV.

[Don 79 TA]

Originally Posted by i82much

can you run those GZ pumps for extended street usage? would they last say 50k miles?

I would call GZ on that
i've run mine on the street for years
i think speed may be a factor in how long the internal wipers last (your pulley ratios)
i know he offers a rebuild/testing service
if your engine is not sealed up good, you may accumulate excessive oil in the catch can, so you'll need to check on that.
the only thing i would change on my setup would be to use valve covers with built in AN fitting for the hose (simplier setup). Doing the breather thing looks a little gawdy (just my taste), and i'd do #12 hose instead of #10
GZ has photos of my setup on his site. you can get as creative as you want with these things (well as your ability/wallet allows).

[i82much]

Originally Posted by Don 79 TA

I would call GZ on that
i've run mine on the street for years
i think speed may be a factor in how long the internal wipers last (your pulley ratios)
i know he offers a rebuild/testing service
if your engine is not sealed up good, you may accumulate excessive oil in the catch can, so you'll need to check on that.
the only thing i would change on my setup would be to use valve covers with built in AN fitting for the hose (simplier setup). Doing the breather thing looks a little gawdy (just my taste), and i'd do #12 hose instead of #10
GZ has photos of my setup on his site. you can get as creative as you want with these things (well as your ability/wallet allows).

Thanks for the info!! Currently running an adjustable ME Wagner PCV valve, will see if it cuts oil consumption this summer and think abt a vacuum pump if it doesnt.

[Gator67]

Originally Posted by i82much

Thanks for the info!! Currently running an adjustable ME Wagner PCV valve, will see if it cuts oil consumption this summer and think abt a vacuum pump if it doesnt.

How did the Wagner PCV valve work out?

[Half-Inch Stud]

Well, i tried the evac to headers and grew tired of the lack of ability there at idle.

Grew to fondness for the PCV system to remain intact for best oil quality during idle and such.

Enter the desires for a vacuum pump to augment the PCV, and scuttle the header evac. Heck the vacuum pump might cause the PCV to go away, but heck PCV and vacuum pumpshould both work well together.

[blueghoast]

On my cars I've been running a pcv from the carb spacer with a barb
to a spitter then run to my valve covers, I use baffled VC's too.
I've had very good results with this set-up I try to get lower from
where I draw my vacume as it seams to get more speed on the draw
farther down, On one car I got a barb in the intake about center at
the back and that works good too.

GT

[i82much]

Originally Posted by Gator67

How did the Wagner PCV valve work out?

worked well. i bought a cheap manometer on amazon and confirmed that the wagner valve noticeably increased crankcase vacuum at idle and cruise over a parts store pcv valve.

given the consolidation of part numbers in recent years, i dont know that you can find a good pcv valve for an application with a decent size cam these days. i am glad i went with the wagner.