With no porting or modifications at all, these out-of-the-box parts worked great, and their reasonable price and nationwide availability make them a definite consideration for anyone wholesale cigarettes looking for a killer small-block Chevy street engine.

Our three contenders were, from left to right, the L98 aluminum head, the castiron Vortee (L31) head, and GM's new Fast Bum aluminum head.

The intake ports of the three heads show some basic design differences. The L98 head has a good port opening, but has pushrod clearances that hamper its performance. The Vortec head (center) uses a different intake port design, credited for much of the power increases. The Fast Burn head has a CNC-finished intake port that helps airflow.

The basic D-shape port of the L98 head is a solid design that could benefit from a bit larger valve or some simple porting. The Vortec head uses gentle curves and proper sizing to gain efficiency, while the Fast Burn head goes with a slightly larger D-shape to take advantage of its larger valve. We know the angle is slightly different, but look how much more of the exhaust valve you can see in the Fast Burn head. This "line-of-sight" design limits how much exhaust gases have to turn while exiting the chamber, and there's power in that.

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