Bill, This 1963 Chevy Truck Engineering PDF contains the info that the 4 cyl 153 was used exclusively in P10 model trucks.
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Last edited by Gdads51; 06/20/2024 5:30 PM. Reason: add "trucks" to sentence to clarify

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
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