I've been busy doing some research. I've found a number of interesting things.
http://www.racewindsor.com/performancepartsplus/ratio_table.html That list doesn't list any rods that are exactly 6.125" like Alexandre Garcia mentioned. However, there are a number of alternatives. I don't know about how the rods swap around yet, but I figure if I stick to chevy parts I have a better chance of them working together.
CID Bore Stroke Rod Length
I4-151 4.002 3.010 6.050
350 LS1 3.900 3.625 6.100
366 3.935 3.766 6.135
396 4.094 3.766 6.135
402 4.125 3.766 6.135
348 4.125 3.25 6.135
409 4.313 3.5 6.010
427 Z11 4.313 3.65 6.136
427 4.25 3.766 6.135
454 4.25 4 6.135
502 4.466 4 6.135
I don't know if any of these would work but it's a start. Also if they do chosing the rods will allow me to build in what kind of compression I have. I've already modeled some of this in Excel to compare compressions with different values for stuff. I need a few values though.
Gasket Thickness 0.060"
Piston dish 7cc
Head 72cc
deck height ?
The last one is what I need, but feel free to correct any of them. With those values and 0 deck height I get a compression value of 8.4:1. Which I think must be in the right area. In return I can post the spreadsheet for anyone who would like to have it once I have it done out nicely.
