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Firing order of 1965 through 1970 327 small block engine?

The firing order for 1965 through 1970 327 small block engines is 1-8-4-3-6-5-7-2.

This firing order is consistent across all 327 cubic inch Chevrolet small block engines produced during that period.

Note: While this is the standard firing order, it's always good practice to double-check your specific engine with a service manual or by looking for a sticker on the engine block itself.