Connecting rod length

[Bob Culver]

1 1/4 cc, about 2.5% of c.r, not ideal but the mixture mass and strength varies far more than this cyl to cyl.
If not all machined by same person at same time mixed rod lengths are likely. Operatives generally guess from the old rod so exact 6 inches not always acheived. Nice to have highest cr adjacent the main bearings!