Single Plane M1 P4452898

318willrun said

Weiand action plus... idle to 6000. New for 200 shipped to your door

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This. Great intake manifold to 6000+ top end, keep it a dual plane. 3000-3500 stall converter,3.91 -4.10-4.30 gears(and the camshaft /headwork to make it effective...) is single plane territory.