Porting Vortecs???

[PowerPort]

Hello, new to this site. Not sure if this will help you or not. Worked with these heads for years on 355ci 2bbl holley circle track engines. They like to be ported but keep the cross section tight or you'll lose velocity. Careful on the short side radius, there isn't a lot of material there before hitting water. Widen the short side but only drop it about .060. Blend the radius back about 2'' from your bottom cut. Runner volume when done was 184cc, flowed 235cfm. Exhaust flowed 186cfm, both at 28''. Intake valve measured 1.980 and the exhaust was 1.560, 5/16 stems on both. Motor had 3.500 stroke, 6.200 rods, 11to1 compression. Legal 4412 holley it made 445 hp. 445tq. With a class legal 600cfm holley it made 538hp. and 520tq on a 901 Superflow dyno. Ultradyne cam was used, ground on a 106. Hope this helps you. Thanks