273 rocker arm adjustment

70dart65coronet said
getting ready to go to the Silverwood Coaster Classic Car show this labor day weekend in Athol, ID

Its disheartening to think that i only get to take this car out once a year...anyway here is an update with bad news...

i took the rocker shafts off to see how they were doing and they are galling again on the bottom of the shafts where the big oil hole is to lubricate where the rocker arms bear on the bottom of the shafts.

Also noticed that some of the push rods ever so slightly contact the heads where the holes in the heads are for the push rods. it doesn't appear to be hurting anything just leaving very small marks in the push rods.

I am going to try to contact B3 here at FABO to see what he thinks about this oiling problem, and also to correct the geometry with a kit.

I just want to get this thing bullet proof.

Steve

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Some things I see.

Your geometry is probably not correct. That's why the pushrods are hitting the heads. As expected, the shafts need to go UP and AWAY from the valves. If that happens, the pushrods will no longer hit.

Mike will tell you how to measure for geometry and he can help you.

The shafts should have a groove across the oil feed hole. If you are running solid lifters. The lash allows some oil to get between the rocker and shaft when the valve is on the seat. If you are running a hydraulic lifter, there is never any clearance there, and without a groove, you can get some galling.

Also, you see this galling when you get hot idle oil pressure lower than about 40 psi you just don't have enough flow and pressure to keep the rockers from grabbing the shafts. This is one reason why I always use a HV pump. You can get more oil clear up to the rockers sooner.