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Brand new reproduction of a Boss 351 Harmonic Balancer. will work with 302 and 351 very similar to the 1970 Boss 302 Balancer but does have some differences but still will work on it.. I have both Original Boss 302 and Boss 351 balancers so if you'd like to see pictures so you can see the difference between this reproduction for sale and the factory one. this has the same casting but does not have any visable casting / part or engineering numbers.. can be used on older 302s but has the 1970 and newer 4 bolt pulley flange.