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"The contest will probably come down to the proper matching of heads and intakes. Airflow will not be a problem. We think an important tuning tool will be intake port volume, along with manifold volume and runner length. Indy Cylinder Head has two heads to choose from: the PN 360-1 rectangular intake port and the PN 360-2 oval intake port. Both of these aluminum heads have stock 18-degree valve angles as well as stock valve locations. The heads use 2.100-inch intake and 1.650-inch exhaust valve sizes, and both utilize a stock exhaust pattern. The main difference between them is intake port volume and shape. The rectangular port will be finished between 210 and 220 cc, while the oval-port heads will be finished at 180 to 200 cc. Which head will work better on this engine? Only testing will tell."