[olddog]

Ok I seem to be in a $hit stirring mood - bored maybe.

289/302 8.206 deck height & 4.380 bore spacing
351C 9.213 deck height & 4.380 bore spacing
351W 9.480 deck height & 4.380 bore spacing
427/428 FE 10.17 deck height & 4.630 bore spacing
429/460 10.30 deck height & 4.900 bore spacing
400M 10.302 deck height & 4.380 bore spacing

So where should the SB / BB line be drawn?
Or do we need to look at the bore spacing?