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#933524 - 05/26/12 03:39 PM Which PCV on performance engines?  
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MY FYN 79 Offline
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N/E WI
Has any one done research and found something conclusive about the letter coding and applications for PCV valves on performance engines?

I looked around a lot online and couldnt find anything concrete about the letter coding on PCV valves. The PCV valve I have in the Monte is 90 degrees and labeled 2072 Made in USA and the letter code on the piston is F.

People seem to recommend the AC CV774C for performance engines (application example 75 Blazer 4 barrel), and the AC CV789C for very radical engines (application example people claim 3rd Gen F-cars but I dont see it). Where it gets muddy is that people claim the letter code on the CV774C is E, but I have also seen people claim the direct cross for it is an F.. like I have. No one stocks these AC PCV valves either so looking at them is out of the question.

I have a hard time believing that AC still makes their own PCV valves and are a superior quality, but I could believe they are still more application specific/less universal as far as performance goes.

So am I crazy or has someone else dug into this also? stupid2


~Jeremy~
79 Monte - Sold 5-11-13
Welcome Natalee Mae 3-16-12
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#933534 - 05/26/12 05:06 PM Re: Which PCV on performance engines? [Re: MY FYN 79]  
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Buick Runner Online content
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Buick Runner  Online Content
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Dharma station 1 the Hydra
I bought an new AC Delco PCV valve from Rockauto which has a E. Even with my hotter cam and headers the E valve performed better than the F type most aftermarket brands offer. Seems like most chain and local auto stores no longer stock OEM brands probably due to cost. You either need to go to a dealership or mailorder like Rockauto.

PCV valves come with different flow rates, too much flow and your a/f mixture will be lean. Too little flow and you will get oil leaks and high crankcase pressure. From what I have seen, E valves have a lower flow rate than F valves. F valves seem to flow to much for 305s, even with mode and lean out the idle mixtures causing idle problems. Even then we really don't know how good the quality the aftermarket valves are either. From my experience, aftermarket is almost always much lower quality than OEM parts. Plus the aftermarket often consolidate the same part to many different models regardless if the specs are right or incorrect for individual appreciations, this is one reason it's hard to get a proper rebuild. We just have to accept the days of being able to pick up the correct parts at a local auto store for our cars are long over.

Last edited by Buick Runner; 05/26/12 05:19 PM.

SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#933965 - 05/31/12 02:00 AM Re: Which PCV on performance engines? [Re: Buick Runner]  
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baaboo Offline
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Racine, WI
Wow, I'm glad that I read this. I need a new one and usually get one from a parts store w/o a clue. thanks.


1987 Aerocoupe, 383 Super Ram and 20-gallon custom aluminum tank. Car retired (for now) from open road racing, but I'm not.
#933977 - 05/31/12 03:30 AM Re: Which PCV on performance engines? [Re: baaboo]  
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JAWSS Offline
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Ft. Hood, TX
Do you have the part number for the correct pcv valve?

I found this and wondered if it is correct.

http://www.jegs.com/i/ACDelco-Motorcraft/037/CV774C/10002/-1



86 Monte Carlo SS T-top
69 Cutlass S Convertible
70 Chevelle Malibu (Second owner, grandma car)
12 Cadillac CTS-V Wagon
#933983 - 05/31/12 03:59 AM Re: Which PCV on performance engines? [Re: JAWSS]  
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the_merv Offline
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I don't run any pcv on my setup, constant vent.


1984 MONTE CARLO SS 6spd
6.HO | LS6 INTAKE | CUSTOM CAM | BUILT T56 | CUSTOM 9" REAR | 3.89 GEARS
2002 EBM C5 Z06 | FREE MODS | BOLTONS WITH TUNE
#934156 - 06/01/12 04:49 AM Re: Which PCV on performance engines? [Re: JAWSS]  
Joined: May 2007
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Buick Runner Online content
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Buick Runner  Online Content
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Member

Joined: May 2007
Posts: 4,848
Dharma station 1 the Hydra
Originally Posted By: JAWSS
Do you have the part number for the correct pcv valve?

I found this and wondered if it is correct.

http://www.jegs.com/i/ACDelco-Motorcraft/037/CV774C/10002/-1


That is the right AC Delco part number but I would still check to make sure it has an E and not an F.

BTW, did you know the PCV system was invented during WW2 for tanks?

Last edited by Buick Runner; 06/01/12 05:05 AM.

SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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