Engine - 18V 846, 847
1974-75
High Compression
Distributor - 45D4 41610

 

Degrees

RPM

Dwell

51+-5

 

Static (Haynes)

7

 

Strobe

10

1000

Centrifugal

0.5

600

3

1600

8

2600

12

3400

17

4400

22

5400

24

6400

Max Vacuum

24+-2

 

Note: Manifold vacuum - Clausager shows a 1975 model with it coming off the top of the front carb although there seems to be a manifold port capped off as well. This must be a user modification, done incorrectly, as MGB HIF carbs have the butterfly opening the other way compared to HS carbs, which is why the port is on the bottom of CB and V8 HIFs.