Are my pistons and cylinders junk?
 

78sc
apart for a valve job and resealing and general freshening without splitting the case (still hoping not to)

First bummer was finding that I had Alusil P&Cs
and then I found 24 Dilaver studs ( 24!)
now this:
Just pulled the #6 piston and measured the top land and I can slip an .008" feeler gauge in there ( at 6:00 if the wrist pin is at 3 an 9:00 )
.006 at 12:00

I haven't measured the others yet... it's about dinner time.

How many miles on the engine? It looks like your pistons are worn out. You could look for a used set of Nikasil or bite the bullet and put in a new set of Euro's.

-Andy

...
 

the odometer shows 193,000miles 1978sc

but the car came with zero history.

Clearly the engine has been open b4 since the headstuds are dilaver.

what would a euro set give me?

9.8 compression, high test gas and a fuel injection head that needs to be replaced with the matching euro.
A good set of nikisil 8.5 or 9.3 cr will get you on the road.
Bruce

The Euro pistons will give you about 9.3 actual compression ratio. I don't understand why you would need a different injection head. My race engine went from 9.3 pistons to 9.8 pistons and I didn't even need to rejet the carbs.

-Andy