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148 0401 Imp 04 Z
Imp 04 Z
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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Chevy High Performance
Chevy Hi-Performance