RavenWorks 5.7L Hemi Dimpled CNC Cylinder head package results




RavenWorks is proud to present an incredible cylinder head solution for late model Hemis! After extensive testing and research, we have finalized our CNC ported cylinder heads. We have worked hard over the last few months testing and refining our heads to bring nothing less than the best to the market.

Our intent was to make these heads suitable for both the street and the track. Key features would be a greatly improved power band, with no loss in low end power.

We tossed around the idea of using our in house SuperFlow engine dyno for testing, but decided that sourcing a typical build would be a better way to have valid numbers for our customers that planned to do the same for their cars. We reached out to our friends at the Frozen North LX Car Club, and Steve Udenberg was able to supply us with his 07’ 5.7L Charger for the testing.

Steve’s car was very typical in base mods. A cold air intake, SLP exhaust system, 6.1L headers, and a DiabloSport Trinity with a DS 91ct CAI performance tune loaded into the car. With ~140K miles on the clock we wanted to ensure we had a healthy motor to start with, so a leak down and compression test was performed. Everything looked good so we proceeded to do a few baseline runs. We also note that because this motor was stock with some decent miles on it, we felt we should keep the revs near stock as well. We did keep his DS canned tune in the car for the baseline runs, although we could speculate that the gains seen in the end could have been 15-20hp higher if we had returned the car to a factory tune.


Once the baseline was finished, it was time to tear into the motor and install our CNC spiral cut heads. New Mopar Performance gaskets all around, a new oil pump (as per Steve’s request), new Mopar Performance lifters, Smith Bros 6.1L pushrods, RavenWorks custom cam (street profile), ARP head studs, and a Manley dual row timing chain set were also installed. With new fluids in, a quick check on the motor, and a break in period, we were ready to hit the dyno again.

After straightening out the AFR’s and sometime remapping the car using a DiabloSport Trinity, we were left with a very impressive end result. Peak to peak comparisons are as follows: Stock: 294hp/348tq Spiral cut heads: 348hp/359tq. Comparing the differences at ~6100 we show an even more impressive difference: Stock: 254hp/218tq Spiral cut heads: 348hp/300tq. That’s a difference of 94hp and 82tq at ~6100!!


With our heads held high with the great results thus far, we were excited to see what the dimples would add to the mix. First, we had to tear the heads back out of the car, disassemble them, and add the dimples in with our Rottler 5-axis CNC head machine. We could have chosen to use another set of cores, but in the interest of trying to keep the variables to a minimum so as to not skew our results, we opted to machine the same heads. This would eliminate any core shift in the ports along with ensure that there were no differences in compression ratio from different deck heights. The heads were then cleaned, reassembled with NO OTHER CHANGES. After they were installed back in the car, it was new fluids and back on the dyno for results! The time had finally come to see what this technology would actually do in a real world before and after test.


The first thing we wanted to do was test using the final tune from the spiral cut version, to see where things were at. Looking at the effect on AFR’s you can clearly see what an impact this technology has. It showed about ~7% richer mixtures tapering to about ~2% in the upper RPMs. What does this mean? A more efficient fuel delivery! It does appear that the texture is more impactful before ~4400rpm, but it did change AFRs across the board.


Next it was time to tune to see if we could take advantage of the improved efficiencies. We corrected AFRs to match what they were in the previous tune and started changing timing. Oddly enough, we had to pull timing, about ~3-4 degrees on average to get it to behave the same way as the spiral cut. Overall results weren’t as high as I would have expected, but gains were realized across the board. Average gains were ~3hp and ~4tq. We were expecting more, but it appears that even though the ports do show improvement, there are limitations elsewhere in the system.


In summary: This setup uses less fuel, provides nearly 100whp gains over stock heads and has 82lbs more seat of your pants torque! Street or strip, you will feel the difference!

Please contact us for details on these heads or to place orders.
RavenWorks LLC
10900 89th Ave N
Maple Grove, MN 5569
763-463-3452
[email protected]
www.RavenWorksllc.com
www.facebook.com/ravenworksperformance

RavenWorks would like to thank Rottler Manufacturing for making the cutting edge equipment we use every day. Thank you to DiabloSport for the great tuning platform and CMR support. Thanks to the guys in the RavenWorks shop who worked so hard to get this done, and for sharing the info for all to see. We would also like to thank Steve Udenberg, the Frozen North LX Car Club, as well as all our supporters.