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#1
05-31-2023, 11:33 AM
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PCV Question for Mild Cam in 434 Tri-Power Engine
There has been some discussion of PCV valves vs. crankcase pressure leading to oil leakage.
For a 434 Pontiac engine with Tri-Power, Crower cam (068 higher lift version), 9.5 compression,--which PCV valve would be appropriate. Both our engines spit oil out of the valve cover breather, but never push up the dipstick as some have experienced.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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#2
05-31-2023, 02:05 PM
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I like Delco CV679C (19310783) and SMP V112.
Oil out of breather mostly get cured by using the bolt down baffles under valve covers. Cure for ring blowby is re-ring engine. |
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#3
05-31-2023, 05:39 PM
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It seems a whole lot of valve covers ( aftermarket) put the breather hole right the heck above a rocker arm squirt hole.
I like Moroso tall covers and have always made thin gauge steel baffles to go below the breathers and then JB welded them to the valve cover.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
05-31-2023, 05:48 PM
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Both of Dick’s GTOs are correct looking restorations so you can bet that both have stock GTO chrome covers, one of which has the factory push-in breather cap. Both have factory valley pans with the rear PCV location.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#5
05-31-2023, 06:38 PM
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What can one say, if your not running restricted oiling up to the top because your running a hydro cam, and your not making use of a baffle and you do not have breather tube up to the air cleaner, and not running a vacupan and at the extreme not running a dry sump, then this will happen once a certain rpm is reached.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
05-31-2023, 06:53 PM
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That’s why you often see a shop rag tied around or something else pushed up around the breather tube under the cap.
Service regularly. 
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
| The Following User Says Thank You to b-man For This Useful Post: | ||
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