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#1
09-05-2019, 06:21 PM
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75 400 block without a windage tray
I'm having my engine rebuilt for my NO block (XC) in my 75 Trans Am. The block is a 75 and din't come with a windage tray. I bought one from Butler and it didn't fit and after talking to them, they said 40% of post 75 400 blocks didn't come with a windage tray.
Should I not worry about it and build it without one? Or should I modify one to fit? Appreciate any input. |
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#2
09-05-2019, 06:42 PM
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I would not worry about it and just run a good oil pan with a baffle. You should probably also have a main cap that is drilled to bolt down the lower dipstick tube.
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#3
09-05-2019, 06:46 PM
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some blocks are not drilled and tapped on the main caps bosses for the windage tray to mount . If bosses are present, they can be drilled and tapped to mount the windage tray.
windage tray has a dipstick tube extension that fits in the windage tray to the dipstick tube in the block, It is different from the tube extension with the strap that bolts to the middle cap. Your oil pan should have the baffle in the bottom. That's the way it came. Most early engines had the windage tray and no baffle in the pan. I'll send you a PM if you want to send me a pic of your main caps from the bottom. [email protected]
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#4
09-05-2019, 09:07 PM
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If you can come up with four studded head bolts that are the correct length, you can use them as main cap bolts. Then drill the corresponding holes in the windage tray and mount it that way.
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#5
09-06-2019, 08:37 AM
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Mild performance street applications below 5500 RPM don't really need the windage tray. As others have said, the later stock pan with a baffle will control oil climb and keep oil from sloshing into the rotating assy. Higher RPM (above 5500) would produce more drain back and windage churn in the crankcase, which would require additional oil control measures, like deep pans, windage tray, crank scraper, etc.
Any real racing or g-machine build should have a windage tray, to insure oil control during high RPM, or acceleration or cornering.
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#6
09-06-2019, 10:18 AM
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Why did Pontiac switch to a 3/4 length tray? Is there any advantage of using the shorter one or was it just a cost cutting measure?
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2015 Chevy Express  2024 Cadillac LYRIQ 
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#7
09-06-2019, 12:10 PM
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They went that route because the oil pan is so close to the Crank counter weighs up front that the windage exit holes on the full lenght trays are basically blocked off anyway and provide no benefit.
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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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#8
09-06-2019, 10:12 PM
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Thanks all for the advice. This car isn't a quarter mile racer and I just want it to run well. I'll go without the windage tray. It has Edelbrock intake and 72 cc D port heads with a Butler grind RAIII cam and Ram Air Restorations exhaust. I guess if I go over 5500 RPM I'll have foamy oil, but it won't happen too often.
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#9
09-07-2019, 05:48 AM
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A Crank scraper would be the thing to install along with oil pan studs!
__________________
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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