FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#1
|
|||
|
|||
New build, dumb PCV mistake?
After some years of mainly waiting on parts to materialize, my project has finally barked to life. No miles yet, but it idles fine and revs like it has an outstanding warrant. 400/467 stroker, 9.7:1, 041 cam, pretty much a fuel injected Jim Hand clone.
I'm almost sure we made a mistake by installing a sheetmetal valley pan. When I bought all the hard parts years ago, I was leaning towards a roller cam and the Tomohawk valley pan didn't exist yet, so the unbaffled valley cover was the only solution I was aware of. Now I realize it's likely going to suck a ton of oil, foul up the O2 sensor and spark plugs, and generally not work for my combo. Would you take everything apart and swap a Tomohawk pan in, or hack up a catch can solution? Not totally opposed to a vacuum pump situation, but it seems like overkill for a hot street car and I'm not sure how feasible it is while retaining power steering and A/C in an already cramped F-body. Any help or advise is welcome. Bonus points if you can confirm or deny that the (well respected) builder is crazy for recommending straight 30wt oil. |
#2
|
||||
|
||||
Personally I'd put the baffled pcv pan on. It's not a bad job to do in the car.
A vacuum pump would be overkill on such a mild build and frankly take up even more real estate than the ac already does, not to mention, The bracketry may not work with ac in place anyway. |
The Following User Says Thank You to Formulajones For This Useful Post: | ||
#3
|
||||
|
||||
Maybe just block it and run a PCV valve in one of the valve covers?
|
#4
|
||||
|
||||
I have it 2nd-hand from the PMD designers, that the 2-Ply Valley cover was design- intended to condense the crankcase vapors before exiting the PCV valve.
|
#5
|
||||
|
||||
As Mike and Larry mentioned, pretty easy to swap a valley pan. The hardest part is deciding to do it. If the water crossover is separated you can do it without draining coolant. Of note, the Tomahawk pan may require trimming where it meets intake.
__________________
Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress Last edited by grivera; 01-11-2024 at 10:20 AM. |
#6
|
|||
|
|||
Quote:
Also if you werent aware & decide to go HYD roller in the future, the early non EGR vally pans will work for most roller cams, might require slight denting on the underside for larger cams, was told of that option by Ken, the guy that first made the tomahawk pan. As for the oil, you will get a lot of opinions on that, but the fact is if this engine is built with tighter street clearances there is no benefit to using a straight 30w oil or super thick race type oils. These engines called for 10/30 oil and if you have good pressure with that oil that is whats best to run, especially if youre in a colder climate & drive in early spring or late fall when cold the oil is thicker and needs to flow as fast as possible at start up. If 10/30 provides good hot idle psi around 20-30 I would run that weight of whatever brand you prefer. |
#7
|
||||
|
||||
I have only had one sheetmetal valley pan that did not suck oil. I think it was a KRE only had 3 holes and I used a baffled grommet. The Butler has about 15 holes and I "fogged mosquitos" with every king of baffled grommet, mesh in the line. A 2" tall extension. In fact one test drive of course there was a DPS officer who pulled me over. Let me off when I explained what I was doing.
My tomahawk factory style had to have some serious massaging in the corners to fit
__________________
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 Last edited by Skip Fix; 01-11-2024 at 11:53 AM. |
#8
|
||||
|
||||
1973-74 Pontiac 455 Super Duty has the PCV-valve located in the drivers side valve cover. Simple and works from factory.
|
The Following User Says Thank You to Kenth For This Useful Post: | ||
#9
|
||||
|
||||
Quote:
Get your oil cap here: https://www.tachrev.com/SDOilCap.htm |
#10
|
||||
|
||||
Some valve covers don;t have a baffle in the valve cover and I would worry they would suck oil without one.
__________________
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 |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#11
|
|||
|
|||
I'm not sure if the original W-72 valve covers are baffled, or if there would be space to add one with 1.65:1 Crower stainless rockers.
|
#12
|
|||
|
|||
Quote:
|
The Following User Says Thank You to mgarblik For This Useful Post: | ||
#13
|
||||
|
||||
Try the PVC in the valve cover to start and if you're not satisfied then do the valley pan. Remember almost every Chevrolet V8 in the 60's, 70's, and 80's had the PVC in the valve cover.
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
#14
|
|||
|
|||
Quote:
An unbaffled PCV can suck an enormous amount of oil, depending somewhat on where the valve is placed. |
#15
|
||||
|
||||
Put in the proper factory or aftermarket replacement pan that’s already engineered for the job and be done with it.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#16
|
|||
|
|||
That's what I would do. The factory PCV set-up front or rear worked very well. You can change that pan in 2-3 hours taking your time and checking the fit carefully. Rigging up a "Chevy system" by the time you fab and weld up a nice baffle will take just as long or longer.
|
#17
|
||||
|
||||
Quote:
https://www.summitracing.com/parts/t...yABEgJIufD_BwE
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
#18
|
|||
|
|||
Those look like a magic bullet if you have clearance for huge valve covers. I have a brake booster and A/C bracket that would interfere.
Likely going to bite the bullet and install a Tomohawk valley pan. Wouldn't be the worst thing to take a peek at the pushrods after break in. Thank you all for the replies and advice. |
#19
|
||||
|
||||
Quote:
If you're stuck on pulling the intake, I've never found it much of a challenge and no need for a separated crossover. Pinch the upper rad hose close to the water neck, remove it from the water neck and secure the end higher than the rad outlet. Remove any coolant from above the Tstat in the water neck using a bulb-style battery filler and remove the water neck. Use the bulb battery filler to siphon the coolant from the crossover and remove the intake. No spillage and will just cost you a new Tstat gasket.
__________________
Triple Black 1971 GTO |
#20
|
|||
|
|||
Pulling the intake will be a bit more time consuming thanks to the FI system and its associated wiring. However, the very end of a long project seems like the wrong place to cut corners. I can't wait to drive it!
|
The Following User Says Thank You to w72 For This Useful Post: | ||
Reply |
|
|