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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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You can find the casting numbers on inliners.org
Your casting number appears incorrect, it should be 6-7 digits. The number is found on passenger side about middile under side covers.
FO620THU, is I believe the engine code from the distributor pad.
I've had a hard time finding engine codes for a six cylinder.
Larry
I don't own a vehicle that isn't old enough to drink.
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