Valve train noise 525 efi after top ends
 

Just got done top ends on one of my 525 efi. Replaced heads with pre assembled dart pro 1 heads. Replaced lifters with crane long travel lifters, measured and installed .250" longer pushrods from liberty, installed and adjusted harland sharp 1.7 s2001 rockers to 1 turn after zero lash. Issue I am having is after running for approx 45min total, the valve train is clicking/rattling pretty bad and it is not normal. Almost sounds like lifter noise but it is def coming from under valve covers. Removed both covers, inspected for loose components or rocker-to-cover contact. Everything looks perfect. Anyone have any input on my issue??

One turn is little much for Cranes. I know Crane used to say 3/4 turn to get .040 of preload.
I'd run the engine with the valve covers off. You should be able to narrow it down then.
Just because the stuff is new does not mean it can't be defective.

The crane sheet says 1/2 to 1 turn, .040-.060 preload. 7/16-20 rocker studs would mean that 1 turn is .050". I'm going to give scorpion marine endurance rockers a try this weekend. Thanks for the response!

Are you sure the lifters were on the base circle of the cam when setting the preload, I dont think the rockers are the issue

what issue did you have with morels??

the pushrods do have a tiny bit of wear from the guides, no gouging or anything. The guides are set with pushrods in the center of them. All polylocks and lifter studs marked after torquing/lash setting and none moved when rechecking everything. No sign of rockers hitting anything either.

Some find zero lash different then others. Never done a 525, but zero to me is when there is no up/down movement, but turning the rod can still be done. Others do zero as when rod cannot be turned

Are you sure the rockers aren't hitting valve covers? Have you run it with valve covers removed?

When you replaced the rockers, did you reuse the OEM polylocks or use the ones that came with the Harland Sharpes? The OEM polylocks are shorter than the ones that usually come with other brands and the valve covers could be hitting them.

you said one of your engines, twin engines, one is stock and the other one is not ?

Yep, you should be able to spin the push rod. There should be no pressure on it.
Easiest way to do it is with the intake manifold off. Then you can actually see when the lifter compresses.

yes, I'm only doing one engine at the moment, had a pushrod pop off a rocker due to a valve stuck in the guide. Trying to get it back on the water asap so I'm not wasting the entire short summer here in Vermont.

I used the polys that came with the rockers, the center pin on the harlands is recessed, the installed height of the poly is lower than the top of the rocker arm. I'm gonna run it today with covers off and see what happens.

just curious why you didnt stay with the OE lifters and push rods unless the Dart heads didnt allow for it

I wanted to freshen everything from the cam up. Hours since last rebuild are unknown. The pushrods had to be lengthened .250" for the dart heads.