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The Vortec heads feature a 174cc intake runner, whereas our AFR castings sported 180cc intake runners. Because these were relatively close, the torque numbers remained the same, but at over 4,000 rpm, the AFR head port design shined over the Vortec.
Impersonator II

 The Vortec heads feature a 174cc intake runner, whereas our AFR castings sported 180cc intake runners. Because these were relatively close, the torque numbers remained the same, but at over 4,000 rpm, the AFR head port design shined over the Vortec.  View Related Article

 

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