[Charlie ny]

SW,
Ol Ron hit it. My recent few days working with a dynomometer
shop dialing in multiple carb setups on Flatheads opened a new world to
these 70 year old eyes. Each motor has its own likes and dislikes but
in general it seems you can get a good start with certain jets and PV's.
On a 296 Flathead with a big cam we settled on 53 jets and
3.5 PV's. The 53's held the air fuel ratio at 13.9 to 14.1 from idle to about
2800 ,after that the AF ratio went lean.....I installed 3.5 PV's in both carbs
and the AF ratio settled in at the mid 13's above 2800. Max HP and
torque came in at about 4100 rpm, 162 hp, 207 torque.
I guess what I saw tells me that in general AF ratios could be
compromised with big number PV's . Even the 3.5's were a bit rich in this
big Flatmotor.
The dyno doesn't lie and the AF meters are looking right into the
chambers. Ron knows.
The next motor was a 276 incher but that's a story for another
day.
Charlie ny