I know when I first put my motor together I had about a 3/16" to 1/8" step at the bottom of the ports on the head, and that is ehy I port matched mine. The ports on the Holley are slightly taller then a 1262 and slighty narrower. They are Big Ports.
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D/R 10108 NMRA Drag Radial, 25.5 chassis, F1R
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FOR SALE Stainless Steel Torque Box Supports
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