Correct me if Im wrong anyone, but were all the V6 OVAL ports 138HP and the subsequent D Ports 144HP, with the last 11 or however many, 165HP ?
"GOOD BETTER BEST: NEVER LET IT REST: UNTIL YOUR GOOD IS BETTER, AND YOUR BETTER, BEST"
( Furphy WW1 HORSE-DRAWN water-tank end-plates)