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@ Paul,
Thanks for the advice. I'll contact them and see what is possible to the Netherlands or maybe it is digital.
@ Moonshadow
This could be an option when everything goes wrong
. For me it is more fun to do it myself. Learn by doing. And hopefully with your support, because its a firsttimer.
In the meantime I have some information on progress and findings:

I loosened the screws for the adjustment of each rocker and removed the whole rocker arm assembly.
Here is a picture of the valve tip which has no equal surface. I don't know if this is bad.
I'm thinking of bringing the heads to a revising company who can place hardened seats as well to eliminate leaded fuel.

The heads are loosened in incrementals steps, inverse to the normal torque procedure. The head numbers is EAD60850 or EAD6085C. Further L102 is described (julian date?). So John Mummert hit the nail on the head with EAD

As you see, long time no use. I'll put wd40 on it tomorrow

Here is the headless engine.

There were quite some particles fallen into each cylinder. The block has never run after the sellers 'engine revision' .
The message was: Just put under the oil carter and put in some oil and it's ready to go...

I noticed a ridge where the piston rings came to the top dead center.
I can feel it very clearly with my nail. Is this severe? Could this be solved with honing? Send it for overboring?


I'm good in mm, but suck in reading inches what is the bore??
Is it original or overbored.

Good news is that it contains new lifters! This means I have to run them in at the first engine start. I've still got some edelbrock pre-lube red stuff of the corvette.

Bad thing is probably the endtip of the pushrods. The left one is representative for must of them. The left one has more contact surface and the right one is running on the edges.
This means I'll have to find probably new ones or some replacements.
This weekend I'll remove the lifters. Has no need to stack them in order because they are new.
When the lifter is removed I can check which pushrod end fits the best.
In the next days the rocker assembly will be taken apart. Today I've tried some de-greaser to remove the cooked sludge, bust no success. Next step is fuel and a brass brush.
Well that is it for now. I tried to rotate the engine in the stand and it works
. With the heads on, this was not possible
Keep you informed and am curious to your replies!
Regards,
Stephan
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Owner of lincoln '53 capri coupe and capri coupe '54