The rockers are stud mount....no shims involved. And before anybody says it, yes, the heads were machined for studs and guide plates.....zero lash plus a 1/2 to 3/4 of a turn for hyd rollers. Fords like a little more than chevy's do....on the big chevy's we do they only get an 1/8 to 1/4 turn.....
Also, to add to what you were saying, if the motor has been sitting then you will need to start it for a minute to pump the lifters up all the way. If you lash it and the engine has been sitting for a day or longer, some of the hydraulic pressure will have bled off. I was "lashing" my hydraulic cam and some of the lifters "lashed" and some didnt. Then i thought about the motor not being run and the bleed off of the lifters. So i pulled the coil wire and cranked the motor over for a minute (with all the rockers in place where they were as to not destroy something). Then my valve "lash" process was much quicker and simpler. Also it just felt better. I tightened mine by hand until the pushrod had a little drag on it and then turned the lock nut between 1/4 and 1/2 turn. 550+ hp sbc stock block spraying the hell out of it for years and years at 7000rpm with out a problem.
those valves look stock to me....anyway why dont we try to help the OP get this thing running again instead of "what if"ing? like i said i have a set of e7's maybe someone has a spare piston? if the cyl isnt all tore up this prob could have been fixed by now. just my .02
'86 notch--> fired up and ready to go
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