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I had a feeling you wouldn't be able to resist doing the calculations.  😉   I've been reading through the Jason Grey Frankenstein engine builds.  This one is intended to be the Long Rod 2.1.   I've been browsing around for the rods by themselves, and I think NOS 12100-N8500 will be hard to find.  Scat makes (expensive) H-beam rods - part no. 2-6002-2086-857-826.  Agreed on late Z22E pistons, and thanks for the part number.  If I'm having trouble finding stuff, I might just hit up Rebello for the goods.  I've got time to look, so I'll see if anything pops up over the next year while I'm finishing body stuff.

Z20 blocks are 85mm so going to 88mm is a stretch, not impossible, just a bit thin. A Z22 block would be a wiser choice as they are already '87mm bore.   Z20S and Z20E crankshafts are identical to the L20B. 12200-U6000. Look on the counterweight a U60 us cast into them.   Z20E rods (12100-N8500) are 152.5mm a 6" rod is 6.0085mm. Not that it matters much. They are on the '80-'82 S110 200sx and the '80-'81 A10 (HL510)   1mm oversize...  Early Z22E pistons won't work on Z20E 6" rods. This includes all the Z22S pistons in the 720. Too tall. They would stick up above the block 3.55mm Late Z22E pistons should just barely work. Look for January '82 and on S110 200sx. 12010-D8103 is part number for 1mm over size.     Can't work out the compression ratio as I don't know the late Z22 piston dish. I would guess it's close to the early pistons which are 9.32 so that the compression ratios are similar.    Assuming 9.32cc dish, late 88mm Z22 pistons 0.15mm above deck and a crushed gasket thickness of 1.2mm   88m bore block, 1mm over late Z22 (9.32cc dish) pistons, Z20 rods, L20B/Z20 crankshaft ...would have a compression ratio of... 9.56 with open chamber head and 10.21 with closed chamber head.    

I've always loved ZZ Top.  They made an announcement that they are resuming their tour next week after Frank Beard's passing.    I realize the show much go on, but I wish they would call it the Billy Gibbon's tribute tour or similar.  Since Dusty and Frank are no longer around, it doesn't sit quite right with me.    Just my silly opinion..   RIP Frank Beard.   https://axs.tv/news-story/zz-top-vows-to-continue-as-a-band-after-frank-beards-death/?fbclid=IwY2xjawTzF5dwZG9mAWV4dG4DYWVtAjEwAGJyaWQRMUhTdFRjcnVKRmNOckxMODJzcnRjBmFwcF9pZBAyMjIwMzkxNzg4MjAwODkyAAEeSotXAcCeF-4GclTNt8dwNH7k0sOQk8uPr3Sgg1YIGIwkvXVCDn9Zx8Ahm0c_aem_t2QvYesd700qGOHhgAhXIw

Told you Trump wasn't inning the war.... send in the clowns.