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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

351W Questions

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Old May 7, 2025 | 05:06 PM
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Trailering
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Question 351W Questions

I'm working on a 1987 F150 with 351W. I put a new comp cam and roller rockers in. Now the stock valve covers won't fit. I bought some new aluminum valve covers but they don't have any holes for the breather cap. Do I have to cut holes in them or can the engine breath and function without the cap on the valve cover?
Thanks for any help.
 
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Old May 7, 2025 | 05:10 PM
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Carburated? What about the oil cap? Usually, the the oil cap is vented to prevent pressure build up. Do you still have a PCV?
 
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Old May 7, 2025 | 05:21 PM
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When I got it the engine was in pieces in the bed of the truck. I think the cap on the valve cover was the oil cap, so it looks like I'm going to have to figure out how to cut a nice hole in it.
Yes, it is carbureted. No to PCV.
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Old May 7, 2025 | 06:28 PM
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Often it's just the baffles covering the oil fill and PVC holes that contact roller rockers and trimming or removing those baffles is all that needs to be done.
 
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Old May 8, 2025 | 08:18 AM
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Originally Posted by oldF150XLT
I bought some new aluminum valve covers but they don't have any holes for the breather cap. .
Wrong valve covers.
I'd return them and get the correct ones with the holes for the breather cap and oil fill.

 
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Old May 8, 2025 | 12:40 PM
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Thanks
 
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