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1968-1974 Chevrolet K20 Pickup
This is considered normal and is not a cosmetic defect
turbocharged or naturally aspirated
Reflects at least 90% of the radiant energy from your engine
Accurate Within 1deg
MSD Three Stage Retard Control - Adjustable 10000404 1968-1974 Chevrolet K20 PickupThe Three Stage Retard Control allows you to retard your ignition timing in three different stages. You can activate one retard for a nitrous stage and another at top end in high gear for more mph and still have another module left over for dual stage nitrous systems. When activated together, the retard amounts are cumulative so you get the total of the three. For example, if you pull 2, then 4 on the second stage and another 2 at top end, the total
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