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The Iron Alternative
| Fun on the Flow Bench | Besides dyno testing the new Vortec Bow-Tie heads on a ZZ4 crate engine, McLaren performance also put them on a flow bench. Not surprisingly, the high-velocity, high-volume design of the heads produced very good numbers. The heads used in the test were early production examples, not prototypes. So, results should be similar with off-the-shelf parts.
Here's how the numbers looked on the intake side: | | | | SMALL-PORT HEAD | | Lift | CFM | | 0.100 | 67 | | 0.200 | 136 | | 0.300 | 182 | | 0.400 | 223 | | 0.500 | 251 | | 0.600 | 240 | | 0.700 | 240 | | | | LARGE-PORT HEAD | | Lift | CFM | | 0.100 | 63 | | 0.200 | 134 | | 0.300 | 181 | | 0.400 | 227 | | 0.500 | 258 | | 0.600 | 255 | | 0.700 | 261 | | | The heads are comparable until about 0.400-lift, where the runner size of the large-port head really starts to pull its weight. For comparison, we've seen flow numbers on the Edelbrock Performer RPM aluminum heads that show a intake maximum flow of around 228-230 cfm. The Performer RPM had 64cc chambers, 170cc intake runners and 2.02/1.60 valves.
In our opinion, the iron Vortec Bow-Ties performed extremely well on the flow bench. In our opinion, the iron Vortec Bow-Ties performed extremely well on the flow bench. |
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GM Performance Parts
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McLaren Performance
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Chevy Malibu Research
With great deals and authoritative reviews, find all you need to research and buy the new Chevy Malibu, as well as compare it with other vehicles to help you in your car buying process. The 2010 Malibu is offered with your choice of L4 engine, and can seat 5 people comfortably. Also check out the Chevrolet Camaro and the Chevy Monte Carlo.
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