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Numbers Supplement Page

1963 3779553 Aluminum GM Part # 3785644
1964 3842942 Aluminum
1965 3866983 Aluminum
1961-1965 3899621-GM Replacement-{Not Correct But Functional}

409 Horsepower Ratings

1961

360 HP @ 5800 RPM
Single Four Barrel
11.25:1 Compression (Solid Lift Camshaft)
Torque-409 @ 3600

1962

380 HP @ 5800 RPM
Single Four Barrel
11:1 Compression (Solid Lift Camshaft)
Torque-420 @ 3200

1962

409 HP @ 6000 RPM
Dual Four Barrel
11:1 Compression (Solid Lift Camshaft)
Torque-420 @ 4000

1963-65

340 HP @ 5000 RPM
One Four Barrel
10:1 Compression (Hydraulic Lift Camshaft)
Torque-420 @ 3200

1963-65

400 HP @ 5800 RPM
One Four Barrel
11:1 Compression (Solid Lift Camshaft)
Torque-425 @ 3600

1963-64

425 HP @ 6000 RPM
Dual Four Barrel
11:1 Compression (Solid Lift Camshaft)
Torque-425 @ 4200

409 Distributor Numbers

1961 1110919 All
1962 1110919 All
1963 1111023 All
1964 1111023 All 340HP Except Transistor Ignition
1964 1111059 With 340HP Transistor Ignition

348-409 Book of Numbers Catalog Supplement