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#1
02-27-2017, 11:27 AM
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Pcv valve part #
What are you guys using for a PCV valve for a lower than stock vacuum engine? I found one for a Chevy 396 but it is a larger diameter than our Pontiacs. Should I drill out the grommet so I can use the larger PCV valve or just use a stock replacement valve? I keep reading the importance of a proper PCV valve but how do we pick the proper one?
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#2
02-27-2017, 12:30 PM
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Do you have less intake vacuum than a stock RAIV engine? These engines uses a std PCV valve.
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#3
02-27-2017, 06:05 PM
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RA IV would idle about 10-11 inches of vacuum.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#4
02-27-2017, 10:10 PM
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I expect my vacuum to be about 12 inches. Guess the standard one will be fine.
So if Pontiac was able to use one pcv valve for all applications , why does Chevy have multiple valves with different applications ? |
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#5
02-28-2017, 12:26 PM
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I personally do not know..but someone here may very well know.
If not, try the Chevelle forum, full of knowledgeable people. http://www.chevelles.com/forums/#general-tech-area
__________________
"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#6
02-28-2017, 03:45 PM
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Pontiac never had a production camshaft larger in .050" duration specs than the RA-IV camshaft. around 230° @.050 Lift.
Chevrolet had (for example) The 30-30 Small Block Camshaft hydraulic 30-30 : advertised duration: 286 intake/293 exhaust, duration @ .050 : 239 /246 , lift : .483" /.477" , lobe center: 112 degrees. The Duntov Solid Lifter Camshaft: (Also Z-28 Camshaft) advertised duration: 284 intake/291 exhaust, duration @ .050 : 247 /254 , lift : .504" / .498", lash: .012" lobe center: 112 degrees The Chevrolet Z-28 Off-Road Camshaft that a lot of guys ran was even nastier for a street engine. Cam Timing: TAPPET @.050 Lift: Opens Closes Max Lift Duration Intake 20.5 BTDC 56.5 ABDC 108 257° @.050 Lift Exhaust 70.5 BBDC 18.5 ATDC 116 269° @.050 Lift So the Ram Air IV camshaft was pretty whimpy vs the Chevrolet stuff. I did not go into any of the BB Chevy Specs for the 396/375 & 425 HP engine, the 427 425 HP engine, the LS-6 and LS-7 Big Block engines, or the L-88 and ZL-1 engines. All of them had PCV systems installed (if possible) as they eliminated corrosive gas in the oil pan. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#7
02-28-2017, 04:12 PM
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I was just about to post the same question for my 455 with the Stump Puller.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#8
02-28-2017, 07:09 PM
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Heres a link of my experience to getting the right PCV part
http://forums.maxperformanceinc.com/...d.php?t=788780
__________________
 1966 GTO 1966 421-9.3-1 comp-Race Tec 23cc Pistons 1966 Tri-Power 1967 670 Heads Pontiac "Highlift" TriPower Cam by SpeedPro DUR 214 Int 224 Exh @.050 - 107 ICL LIFT .445" Int .465" Exh Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers 1966 Muncie Wide Ratio 4-Speed 1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears |
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#9
02-28-2017, 08:19 PM
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Quote:
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#10
03-01-2017, 11:54 AM
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Quote:
__________________
1966 GTO 1966 421-9.3-1 comp-Race Tec 23cc Pistons 1966 Tri-Power 1967 670 Heads Pontiac "Highlift" TriPower Cam by SpeedPro DUR 214 Int 224 Exh @.050 - 107 ICL LIFT .445" Int .465" Exh Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers 1966 Muncie Wide Ratio 4-Speed 1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears |
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#11
03-01-2017, 01:38 PM
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Looks like the cv881c fits several years of the gm 2.5 Iron Duke engine. If i may add, a rock solid platform.
My combo idles good but i ordered one any way. It will give me something to tinker with.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk Last edited by Blued and Painted; 03-01-2017 at 01:45 PM. |
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