aftermarket 4.0 rocker arms

stx4.0 · Apr 16, 2010

Has anyone used sealed power rocker arms for the 4.0?That is what my local advance auto parts sells for replacements for the stock parts.I assume they are better than the soft factory parts?I am trying to decide whether to go the delta cam upgraded rocker/shaft route or use the sealed power parts.I would rather go which ever route has the best longevity.

Big Jim M · Apr 16, 2010

They may be from the same foundry! Since the life of a rocker is 200K or even more I doubt either would be better than the other.
Big JIm

stx4.0 · Apr 17, 2010

I would hope they are not from the same foundry since the factory parts are soft and wear prematurely because of that and lack of oil flow.You can get 200k out of them yes but by then they are normally making all kinds of noises and when they get that much wear its hard on the valve guides.I know delta camchafts can put a hardened insert on the pushrod end of the rockers and therefore cut down on wear but if the aftermarket parts are better material then that wouldnt be necessary.

aftermarket 4.0 rocker arms

stx4.0

15+ Year Member

Big Jim M

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stx4.0

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