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Author Topic: casting numbers  (Read 2824 times)
dab67
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« on: November 16, 2005, 10:33:36 AM »

This question may have been answered before. What is the reason for having different casting numbers for the same size engine in the same year? Different casting factories, different metal values, different applications? Huh

dab67
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JohnZ
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« Reply #1 on: November 16, 2005, 11:49:43 AM »

There were continuous improvements in the design of the block (and heads, etc.), and each time a minor change was made, a new casting number was issued, as one or more of the cores or final machining operations were affected; standard GM practice. The same casting number block was frequently produced by two or more separate foundries during the same model year, as it took three foundries and five engine plants to produce the volume required for Chevrolet daily car and truck production and service requirements. The Saginaw Foundry fed Flint V-8 and the Flint Motor Plant (6-cylinders) and the Saginaw Foundry also fed the Saginaw Service Engine Plant, the Tonawanda Foundry fed the Tonawanda Engine Plant, and the McKinnon Industries (St. Catherines Engine Plant today) Foundry and Engine Plant in Canada produced many engines for both Canadian and U.S. assembly plants. Chevrolet built 20,000 cars and trucks every day in the 60's; Flint V-8 and Tonawanda each built 5500-6000 engines per day, and the other plants picked up the balance.  Smiley
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'69 Z/28
Fathom Green
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Ron C.
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« Reply #2 on: November 17, 2005, 05:34:16 PM »

This question may have been answered before. What is the reason for having different casting numbers for the same size engine in the same year? Different casting factories, different metal values, different applications? Huh
well as for the big block 396 engines there were hi perf 4 bolt main engines and 2 bolt main engines that had different casting numbers,as for the small block engines im not sure if the 350 ci 2bbl carb had a different number than the 4 bbl carb engine.there were so many different engine options back then it would be hard not to say that maybe a 307,327,350,or a 396 and a 427 might have 4 different casting numbers each for many reasons.maybe someone here might have this info.good question though and im sure it will be duscussed further.

dab67
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67Z/28,67RSZ/28,69RSZ28,71SS454CHEVELLE,02Z4C35thSSCAMAROGMMG#11PERF EDITION 500HP
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