C 10 1/2 Ton Pickup 2WD L6-250 4.1L VIN D 2-bbl (1982)
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Distributor: Application and ID
HEI distributors with EST can be identified by the following;
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They have no distributor mounted vacuum controls--spark timing is controlled electronically.
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With EST system uses a seven terminal High Energy Ignition (HEI) module