The 400’s bigger main cap (Diameter of 2.65 journal crank compared to 2.45 for a 350) causes the outside bolts on the four bolt blocks to actually weaken the block in the main web area making them more susceptible to cracking under high stress.
The 400’s bigger main cap (Diameter of 2.65 journal crank compared to 2.45 for a 350) causes the outside bolts on the four bolt blocks to actually weaken the block in the main web area making them more susceptible to cracking under high stress.