Heading out now for the weekend Jim but I am interested in this stuff, all or part. I'll call you Monday.
Just an FYI, and not to jam or slam Jim, John, Lord knows he knows what he's doing and a great guy to deal with, the compression numbers he's quoting are likely with a late D9 block with 10.322" compression height (Undecked or machined) block. Typical blocks we deal with (D0VE or D1VE) are at 10.3" or 10.310" as cast (Again, undecked).
IF these are TRW L2443-NF pistons (best pistons out there for a N/A moderate/heavy 460 IMO and no longer made), and I suspect they are, on a 10.3" or so block you can expect real compression ratios more like 11.75:1 with D3 heads or 13.5:1 with C8, C9, or D0 heads. C/R's might be where Jim posted for a D9 (External balance, un-machined) block and crank, haven't done the math on that or tried it, and Paul Kane might not be a bad resource to verify this. PM me I'll give you the number.
That being said, what you CAN do if going to run them zero decked (No matter the block or crank, but simply machined to 10.3" or so compression height) is have .080"-.100" machined off the domes on the pistons which would drop you to 11-11.25:1 c/r with D3 heads. AND I have an extra, replacement, brand new L2443-NF .030 piston to complete that set for ya!
Ray
