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wind & fire = guides to power
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1,529 Posts
Discussion Starter · #1 ·
This is basically a .030" 350 with Vortec heads and a Performer intake.

The cam is essentially a ZZ4 roller cam used in the middle graph.
The fisrt graph is the intake specs also on the exhaust lobe and the third graph is the exhaust specs used for the intake.

Notice that using an even duration cam with the larger lobes(510/510) still made MORE torque thruout the RPM range than either one of the smaller cams by an averge of 3HP at each interval.
Also notice that at 5000 RPM both even duration cams(474/474 & 510/510) had a higher Volumetric Efficiency(91&91) than the split duration(91).

*note: open headers
 

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Race it, Don't rice it!
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8,814 Posts
Split patern am are crutches for a poor flowing port. If the heads don't have poor flowing port's at a given lift and duration power will decrease because of he ealier blow down.
 
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