351W Questions

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May 7, 2025 | 05:06 PM

oldF150XLT

Thread Starter

Trailering

Joined: Oct 2004

Posts: 21

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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.

May 7, 2025 | 05:10 PM

Prototypemech

Logistics Pro

Joined: Nov 2013

Posts: 3,930

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From: Mojave, Ca

Carburated? What about the oil cap? Usually, the the oil cap is vented to prevent pressure build up. Do you still have a PCV?

May 7, 2025 | 05:21 PM

oldF150XLT

Thread Starter

Trailering

Joined: Oct 2004

Posts: 21

Likes: 4

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.
Thanks

May 7, 2025 | 06:28 PM

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

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From: Ottawa, Ontario

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.