PML designed these covers to prevent oil blow by. The valve covers that Jeep supplied with the 258 engine tended to leak and cause an oil blow by problem which blocked the PCV valve. The improved baffle of the PML valve cover blocks the oil mist from reaching the PCV valve and solves the oil blow by problem. The baffling is an integral part of the casting so there are no rivets or screws to vibrate loose.
The 258 engine was commonly used in the CJ-5, CJ-7, Grand Wagoneer, Wrangler, and other Jeeps.
This valve cover fits 1981-1986 heads.
This valve cover also fits 1987-1990 heads if your engine came with the plastic valve cover. If your 1987-1990 engine came with an aluminum valve cover from the factory, our valve cover will not fit your head. Engines with the aluminum valve cover have the same gasket shape and bolt pattern as the 4.0 heads. Look at the installation instructions (click here) for a better view of the gasket shape and bolt pattern on this valve cover and verify it is the same as the valve cover you have.
The cover features holes for PCV, breather, and includes a billet oil fill cap for a secure seal. The Jeep 4.2 Liter/258 cubic inch engine comes in four possible fastener configurations. The PML valve cover works with all possibilities and has provisions for the use of studded bridges and head bolts. The cover features a precision-machined 0.200 inch-thick gasket flange for a uniform clamping force on the gasket. Holes can be easily drilled for studded rocker arm bridges.
PML Valve Cover Features:
Strong sand-cast aluminum construction
Thick side walls and gasket flanges that will not bend when bolts are tightened
Cast-in internal baffles
Mounting hardware included
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