I'm going out on a limb here a little bit.. I guess that the '81 California 250's that had electronic spark control used a knock sensor. Since these motors never made it north of the border - its an guess at best.

If they did use a knock sensor - get a knock sensor and the ESC module for the '81 250 - they are tuned to the engine size. I'd keep the ESC module to ECM wiring and run the knock sensor.

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Last edited by efi-diy; 03/01/09 09:44 PM.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them