Re: Boss 429 vs. 427 SOHC- which one was best ?
There is some merit to that observation- the 429 had a 3" main journal,
and the 427 had a 2.75" main journal- the smaller main journal will
have less friction and make more power and rev higher, given the same
airflow, cam, carb, headers, tuning. Reason being the larger journal
has more area in the bearing to produce rubbing friction on the crank.
But it seemed to me the 429 had a more modern cylinder head. The one
thing I found odd about the old FE design was, the pushrods were
interfere with the intake ports and are in the way- the flow has to go
around the pushrod bulges in the intake.