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The CV-1 exhaust port is patterned after the round Ram Air version but is raised approximately 3/8 inch. The OE port exit limits exhaust flow potential, so Roland offers a convertible exhaust option that machines the port exit back into the casting, raising the exit. This mod is reminiscent of the Cleveland 4V head modification first performed by Bob Glidden back in the early days of NHRA Pro Stock racing. This would also require custom headers.