Big Block Tunnel Ram 660s Questions

66Valiant528 said

Hey that's not the primary metering block that's on my 660s. And my blocks have a threaded port for ported vacuum.

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They are the same. 5913 and 4224. Mine have a threaded hole for ported vacuum but it doesn't go anywhere. Not fully drilled to the port. Just drilled and tapped on the surface. Maybe yours was drilled, maybe you don't have vacuum advance...