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Is the rod that pump gas in motor of 1977 Chevy 350 d same size late model engine?

No, the pushrods used in the 1977 Chevy 350 V8 engine are not the same size as those used in more modern Chevy engines. The pushrods in the 1977 350 V8 engine are longer than those used in later model engines. This is because the camshaft in the 1977 350 V8 engine is located lower in the engine block than in later model engines. The longer pushrods are necessary to reach the camshaft.