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Having won Engine Masters already twice with a runner-up position on their very first outing, the CHI 3V heads had plenty to offer right out of the box, especially since they were shipped with CNC combustion chambers. Wanting to maximize power production, we gave them to Bryce Mulvey at Dr Js. Bryce cranked up the magic porting machine and tuned them up to flow 334 cfm on the intake, and 228 cfm on the exhaust. The heads now flowed enough to support more than 700 hp.