[Grady Clay]

Paul,

6131196 decodes as:

6 = Engine designation; 6-cylinder unit.
1 = 911T-E, MFI either type 911/57 or 911/67 (Sportomatic).
3 = Model year 1973.
1196 = Sequential number.

This is closer to being a ‘7R’ crankcase. What is it?

When you say you have “both oil coolers” are they both the engine coolers or do you have a front oil cooler set-up?


Probably the critical question is the condition of the P&Cs. Be sure to keep each piston matched with its cylinder and wrist pin.

The ’72 heads will have the provision for the MFI injection nozzles. The ’70 heads do not have the MFI ports. The ’70 heads are the easiest to work with as they have the most metal. They are very desirable for enlarging the ports and contouring the combustion chamber to match the pistons (90 mm RS?) you choose.

If you can retain the original P&Cs, everything bolts together.

If you retain the original pistons, be very careful if you change camshafts. Higher lift, different timing cams can have the valves contact the pistons with very bad results. Measure, measure, measure.

Is there any possibility you can find the original MFI system?

Best,
Grady