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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 08 Sep 2017 :  1:02:03 PM  Show Profile  Reply with Quote
I installed a new AC Delco PCV # CV881C. Application is for the GM 151 IRON Duke 4 cyl. I removed the fram 202? for a 400 application. The Delco is physically the same size and lacquer coated.
Apples to apples, a 4cyl will have less vacuum than a V/8. So the opening calibration should be better suited for a proformance camshaft. Total flow should be the same.
Since the install, idle vacuum has increased almost a full point. I have more control at the idle mixture screws. Was able too drop idle speed to 950 in nutral and 750 in drive. Power brakes are more responsive and predictable. Idle is almost smooth with a slight lope.

Note/ Valve installed on a 461 with 228 intake duration, 9.5 to 1 compression @ 8000 ft elevation.




Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

cortcomp
Coyote

USA
5338 Posts

Posted - 08 Sep 2017 :  2:54:57 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Good thing to document, thanks for sharing!
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JOHN-M
Buffalo

USA
88 Posts

Posted - 08 Sep 2017 :  9:08:50 PM  Show Profile  Reply with Quote
That sounds pretty good. I saw an article awhile back about an adjustable PVC valve. I think it was a M/E Wagner adjustable PVC valve. Look interesting but a little expensive. Wasn't sure if it was worth the cost. What you have going on sounds decent and I'm sure a lot cheaper. Anybody messed with on of these Wagner valves?
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 09 Sep 2017 :  12:05:53 AM  Show Profile  Reply with Quote
I think it was 6 bucks with shipping.
Money well spent IMO.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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SIX8YAK
Tribal Scout

USA
13 Posts

Posted - 09 Sep 2017 :  3:04:41 PM  Show Profile  Reply with Quote
Good info, Blued!

1968 Grand Prix 400/TH350
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Hikin Mike
Tribal Scout

USA
20 Posts

Posted - 19 Sep 2017 :  01:59:58 AM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
I ordered one last week and got it today. There was no change in my case.

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
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cortcomp
Coyote

USA
5338 Posts

Posted - 19 Sep 2017 :  09:20:40 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
I would assume that you were drawing enough vacuum for the current pcv to work properly then.
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