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I finally received my Edelbrock 3731 (2 yr backorder!) and find that my stock baffle will not fit it without significant surgery. I have some perforated aluminum mesh, and I can create a baffle out of it. I also understand that I should have some stainless steel scrubby pads in the chamber for extra oil separation. If I am going to run a valley pan, do I need to have a full baffle under the manifold?
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1990 Grand Wag
R4B/Holley 4160
I might lament the amount of grease and oil on the underside, until I think about the lack of rust.
That is a great question. I'm getting ready to reinstall the same manifold on my 304 that did not have a baffle on it. I can say from experience that with no baffle, you will see some oil consumption through the PCV valve. I have not heard of using SS wool as an impediment to the oil? Where did you come by this? I heard from Stuka that the OEM baffle is different if the manifold has EGR or not. Is this the reason your baffle will not work? 2 year backorder!!! You are persistent my friend.
The idea of the stainless steel wool is the desire to have something as unreactive as reasonable. I have heard of using steel wool, but the fibers are so small that I would be worried about them ending up in the oil system. Also, with stainless steel pads, I think that I can check on them with the grommet removed.
1990 Grand Wag
R4B/Holley 4160
I might lament the amount of grease and oil on the underside, until I think about the lack of rust.
Yeah, I also don't like the idea of having small steel fibers in an area that could get back into the oil pan, and thus through everything else.
However, I don't think I would use perforated metal like shown. I think it would work a lot better than no baffle at all. But you only need enough openings to allow crank case pressure to equalize. The stock one just has three louvers. So i think a piece of sheet metal with a few hand made louvers would work well as louvers require any oil to change direction to make it out the PCV. They aren't too hard to make. Or if thats not an option, just fewer holes. As it is now, that many holes would allow the oil to go straight through.
Hmm, yeah. The original baffle seems more like a splash deflector than even the coarsest filter. If louvers are beyond your metal working capability, perhaps you could make something that's two layers of steel with spacers in between, and holes with no direct line-of-sight through the baffle.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
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