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Car Craft – LS Cathedral Port Vs. Square-Port Heads

In the August 2012 issue, the editorial staff at Car Craft looks to answer two questions. First of all, how much power is an LS3 upgrade worth over stock cathedral-port heads? And secondly, how does the upgrade compare to a set of aftermarket heads? To answer these questions Car Craft made a variety of pulls on the dyno featuring each set of heads on their test engine. The project features a COMP Cams camshaft, COMP Beehive™ Valve Springs, a FAST™ LSXR™ Intake Manifold, a FAST™ 102mm Big Mouth Throttle Body™, and FAST™ Precision-Flow™ Fuel Injectors and fuel rails. You can read about the outcome of the experiment by clicking on the attachment below. We also encourage you to purchase the August issue of Car Craft.

Click on the link to see Car Craft PDF.