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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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| | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | 1952 6400?
The big Chevrolet trucks may have valve covers without an oil fill cap. Just the vent slits and the holes for the two studs going down to the rocker assembly.
There may be an oil fill cap on top of the road draft tube but no mesh.
Would you please post a picture of the mesh and it's location.
A GMC 6 cylinder engine may have a filter on the road draft tube but the big GMC stamped letter on the valve cover is obvious and the engine not a 235.
Last edited by buoymaker; 07/18/2022 7:06 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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