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Dart designed the new 275cc oval port Pro 1 aluminum heads using wet flow technology instead of just air to closer represent the air-fuel mixture the ports have to carry. The heads are cast from virgin 355-T61 aerospace alloy and have a compact heart-shaped 119cc combustion chamber, raised exhaust ports (0.300), raised spark plug location to produce great flow for low- and mid-range power. Max flow is (per Dart's flow sheet) 352 CFM intake and 258 CFM exhaust at 0.700 inches of lift at 28 inches of water. Plus, the Pro 1s can be used with off-the-shelf pistons, valvetrain components and intake manifolds. Here's Jeff finding TDC so we can set up our new timing pointer later on.