Manifold Swapping for Roots Blower - 134 HP With One Bolt-On!
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The Boss 302 uses an early-style ('65 to '69) 3-inch balancer that is drilled for the three and four-bolt pulley pattern. If you are using an early block or a Boss balancer, you will need a pulley spacer kit (PN 90683) to properly align the blower pulley. Be warned that the spacer is only drilled with three boltholes, so it might not match your lower accessory drive pulley. View Related Article
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