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The intake ports of the Pro I CNC heads are thoroughly massaged, measuring 227cc and moving 302 cfm at 0.600 inch lift. Our stout cam, when combined with 1.6:1 rockers, works 0.600/0.619 inch lift and 248/254 degrees duration at 0.050--an ideal match for these heavy-breathing heads.
Chevy Small Block Dyno Tests - Old School Meets New

 The intake ports of the Pro I CNC heads are thoroughly massaged, measuring 227cc and moving 302 cfm at 0.600 inch lift. Our stout cam, when combined with 1.6:1 rockers, works 0.600/0.619 inch lift and 248/254 degrees duration at 0.050--an ideal match for these heavy-breathing heads.  View Related Article

 

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Source Interlink Media © 2008 Chevy Hi-Performance,
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