289 FIA vintage race engine with Webers

[1795]

Gary,

First off, the engine has 12.5:1 compression ratio and is running on 110 race fuel.

Weber specs:

Choke: 42 mm
Idle Jet: .70
Idle Jet Holder: 1.00
Emulsion Tube F-11
Main Jet: 150 (we started with a 165 but it was to rich)
Air Corrector: 200
Pump Jet: .050
Acc. Pump Exhaust Valve: .45
Float Setting: 5.5 mm

Crower Cam specs

Intake:
Duration: 292 degrees
Lift: 6.06
Valve Clearance hot: In .016 Ex. .024
Rocker arm ration 1.6 both intake and exhaust.

Duration at .050":

Intake: 256 degrees
Exhaust: 266 degrees.
Lobe lift: Intake : .379, Exhaust: .375

Total advance ws 38 degrees (tried 36 degrees but the engine did not like it).

The builder thought thought that the 106 cam, with .640 lift was too much for the old engine with the Holley 750 and there is not much out there to suggest that Webers like that much LSA.

I was thinking about having a backup set of Main Jets just in case I start running too lean, what is the next size richer from the 150's?

Jim

[byronpete21]

Sounds amazing Jim. That torque curve looks great as well. Congrats on getting her built. Welcome to the wild and wonderful world of Weber carbs.

Byron