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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,118 Posts1,056,302 Members48,439 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2019 Posts: 4,482 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,482 | The slots work in conjunction with the road draft tube to evacuate combustible vapors from the crankcase. The slots draw in fresh air and the road draft tube provides the vacuum.
As long as the replacement valve cover has a breather on the fill cap all is good. It the cap is not of the breather type, it could cause engine oil contamination, sludge build-up, oil leaks, high fuel consumption, and other engine-damaging problems.
If it was me, I would have fixed the leak!
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc BrakesProject JournalsStovebolt Gallery Forum | | |
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