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What is a Big 10 or Heavy half?
i just purchased a 77 half ton pickup and the 4th digit in the vin is a 4. the gross weight for this truck is 6050 lbs. this makes it a Big 10. this is a calif. truck but no cat converter. also the intake manifold(v-8) dosent have an egr valve. is this correct? or do all trucks regardless of weight require an egr valve? what are emissions for the heavier trucks? thanks
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