Shooting for around 12:1 compression, not sure on quench. Here's what I got.
heads 62cc
piston relief 5cc
cometics .060"
gasket bore 4.130"
cyl bore 4.030
piston to deck .019 out of the hole (no comments please )

I came out w/ 11.975 static comp and .041 quench.
If my math is correct I think that is as close as I can get with the quench. If I go to a .051" gasket and a bigger cc head to keep 12:1 the quench is too tight
(.030"!)
If cometic made a .056 gasket I would be at a .037 quench-I thought that would be ideal but not sure if they make that thickness. What do you guys think?
By the way-its an iron 408 and I have not ordered the heads yet. Going with TEA TFS. I hope I covered everything-I'm sure someone will let me know if I didnt

 

.030 quench is not to much,i'm running cometic .030 with the piston .004
out of the hole

 

From what I have read you would be better off with the smaller combustion chamber. That would help for a better burn. On the flip side I don't recall anyone building a motor with the piston .019" out of the hole. So there may be other factors at play here.

 

When the motor was built it was only a few thousandths out of the hole. The deck was somehow damaged and had to be resurfaced. After decking out the scratch and squaring the block we ended up .019" out. I guess it beats buying
and machining a new block.

 

Wow, everyone I have talked to on this forum has said not to go below .030 quench-and that was pushing it. How does she run?

 

depends how far on the ragged bleeding edge you want to run your motor. If you think about heat expansion and piston rock, .026 isnt a whole lot of room.

 

.026 does seem a little close to me, plus don't you need to leave room for carbon build up.

 

Any other suggestions?

 

I am not an engine builder, but am currently having one built by a shop that knows their ****. We have discussed proper quench and they firmly say the between .040 and .045 is the "magic number" for best power and efficiency.

 

Thanks man, I guess I will go with the .060 cometics. That puts my quench at .041".