Dyno Results of the Cylinder Head Shootout

The results are posted against the vendor that made the most Horsepower / Torque. Each of the three competing vendors are displayed against them.

We elected to use PPP's (Power Ported Performance) dyno run on 1/17/08. Reason we did this is because this dyno was taken on Chris's car after the installation of the Zoomers exhaust system. When we re-dynoed his car (a week after the "Rumble in the Desert") just prior to removing the cylinder heads, we noticed a significant drop in Horsepower and Torque. When we began the tear down this is when we noticed the damage that was being done to the valve rocker assemblies, valve stems, and valve retainers. Our only choice was to use the run prior to this run. We still do not know or won't know what the condition of the PPP heads where on the dyno run of 1/17/08.

PPP known as Power Ported Performance

PR&D known as Performance Research and Development

HHP known as High Horse Performance

Mopar Performance known as MPSC

The cylinder heads tested where:

PPP's Stage III 5.7L 2.05 Intake / 1.60 Exhaust - $2,499.00 + core

PR&D 5.7L 2.02 Intake / 1.60 Exhaust - $1,920.00 + core

HHP 5.7L "392 Version" 2.02 Intake / 1.60 Exhaust - $2695.00 + core

Mopar 5.7L 2.05 Intake / 1.60 Exhaust - $2,813.00 ( no core)


PR&D, HHP, and Mopar Performance cylinder heads where all data logged for KR and where re-tuned for maximum WOT performance. All runs where done using straight 104 Unleaded Sunoco Fuel.


Dyno Test 1
The PR&D heads would show KR activity even at 23 degrees total timing. Towards the end of the run you can see the increase in power from the computer adding back in the timing. Tuners will know that these engines have strong harmonics between 3,600 RPM's and 4,800 RPM's. These harmonics and the added harmonics from the valve train / rocker arm interference possibly caused the excessive KR activity.

Dyno Chris 159 = PPP
Dyno Chris 166 = PR&D



Dyno Test 2
The HHP heads showed a Horsepower / Torque gain from @3,900 RPM's to 4,900 RPM's. From the dyno report you can see that the difference in Horsepower / Torque could very well be from the difference in intake valves : 2.05 vs 2.02.

Dyno Chris 159 = PPP
Dyno Chris 170 = HHP



Dyno Test 3
The Mopar Performance heads showed a very similar curve next to the PPP Stage III mainly because they come from the same CNC Company. PPP has told us that they have a proprietary port design that makes their version different than those from Mopar Performance.

Dyno Chris 159 = PPP
Dyno Chris 172 = Mopar Performance



All Vendors Overlayed



I'm still working on the graph's for the flow chart. This will be the breakdown of the cylinder heads i.e. open and closed spring pressures, intake cc's, exhaust cc's, combustion chamber cc's and more. Thank you to the vendors who participated.

Discuss here... http://www.srtconnection.com/forums/showthread.php?t=3372