Pro Comp Head Test - Budget Brute
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After swapping the CNC-ported heads, peak power numbers jumped from 463 hp and 480 lb-ft to 505 hp and 489 lb-ft of torque. The extra breathing offered by the CNC porting showed dramatic gains, with as much as 54 hp at 6,000 rpm. The slight loss in power below that point (4,300 rpm) can be attributed to the drop in static compression caused by the CNC work on the combustion chamber. Had we elected to mill the CNC-ported head to duplicate the compression ratio on the as-cast head, the power gains would have been even greater. View Related Article
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