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'68 390 Mods |
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Blue68SST
AMC Apprentice Joined: Nov/04/2014 Location: Mississauga, On Status: Offline Points: 123 |
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I had the valve covers off last spring, the seals looked good. Great idea on checking the cam, thanks. As for the manifolds, I have already picked up a good used set of free flows, that, and a new exhaust system are up next on the to-do list.
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Blue68SST
AMC Apprentice Joined: Nov/04/2014 Location: Mississauga, On Status: Offline Points: 123 |
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Update.....after re-assembly and several hundred miles driven, virtually no oil consumption! Probably a combination of vacuum leak on the intake manifold and no baffle on the intake.
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69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Not true. All you have to do is look at the ends of the manifold flanges and you can see the edge of the gasket. You may also be missing the baffle plate. Take out the PCV valve and drop a long screw driver down the hole. a tin clank sound means the baffle is there, a dull thud means you hit cast iron and neither the baffle or valley pan are in place. |
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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scotty54
AMC Apprentice Joined: Aug/07/2015 Location: TN Status: Offline Points: 70 |
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AMC Enthusiast says:
One more thing: don't put the square top cheapie valve covers on your '66-'91 AMV8 engine. The stock curved top valve covers are specially made to deflect oil spurts from the pushrods to the rocker arm tips for superior lubrication. (the Chevy style square top valve covers forfeit the optimized curved shape to reduce lubrication to the rocker arms tips) This is the first time I have heard anything about valve cover design. Very interesting - have you conducted tests, read about this, or other determining method? I am about to place of set of vintage Milodon covers on my 401 and you have me thinking.
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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iirc the functional intentional oil-deflecting shape of the stock AMC valve covers is / was / may have been
mentioned in the AMA or SAE papers about the introduction of the new for 1967 AMC V8... or maybe Performance American Style or the later AMC Power Book.
Edited by PHAT69AMX - Sep/01/2018 at 10:31am |
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scotty54
AMC Apprentice Joined: Aug/07/2015 Location: TN Status: Offline Points: 70 |
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I continue to be amazed at the degree even the smallest things are engineered. After digging out my Milodon valve covers (packed away 15 years ago) I am happy to see that the angle of the lateral side of the cover has the same angle as the stock cover.
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AMXFSTBK390
AMC Addicted Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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As we know, Edelbrock makes excellent ($$$) aluminum heads and valve covers. The Eddy classic cast aluminum valve covers tend to be mostly square at the top. This implies the curvature of the top of the OEM valve cover may not offer needed help in lubricating the rockers, otherwise Edelbrock would have incorporated this feature into their rocker covers. Obviously the jury is still out on this. This myth has been going on for decades.
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Questions are powerful tools...what's in your toolbox?
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