PUSHROD AND HYDRAULIC TAPPET CHANGES IN CHRYSLER ENGINES Back

273, 318, 340, 383, AND 440 CUBIC INCH

On the above mentioned 1968 Chrysler V-8 engines the pushrods have a 5/16" spherical diameter on each end, and can be installed into the hydraulic lifter from either end.

On previous models it was necessary on installation of the pushrod that the large end mated with the rocker arm and the smaller end with the hydraulic lifter.

This change in the pushrod configuration required a change in the tappet design so that the 1967 and the 1968 tappets and pushrods are not interchangeable.

 

To prevent a premature engine failure due to a bent or distorted pushrod, precautions should be taken when installing the push rods to see that they are properly seated in the tappet plunger caps. If a pushrod is not properly seated it can cause the pushrod to hang up on the top surface of the plunger cap on the edge of the tappet, and when the rocker arm shaft is torqued down in place, or when the engine is initially started, it can cause the pushrod to bend or distort.

(P50)