Cathedral Vs Rectagular Port Cylinders Head To Head 015
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12 Next up were the Mast rectangular-port LS3 heads. Like their cathedral-port cousins, the rectangular-port heads from Mast featured full CNC porting. The combination of slightly larger intake port volume (256 cc versus 245 cc) and larger intake valves (2.165 versus 2.08) resulted in an increase in maximum intake flow (372 cfm versus 335 cfm), though the difference measured at .600 lift (near our .624 max) was 360 cfm versus 335 cfm. View Related Article
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