Estimate relative engine length: number of cylinders in 1 bank × bore pitch, + 1 rod width if 2 banks (use 1.00" for rod width if unknown). Actual length will vary based on bell housing design, accessory drive, etc.
Types in size order, smallest first:
V4: 2 × pitch + 1 rod
V6: 3 × pitch + 1 rod
L4: 4 × pitch
V8: 4 × pitch + 1 rod
L5: 5 × pitch
V10: 5 × pitch + 1 rod
L6: 6 × pitch
V12: 6 × pitch + 1 rod
