09 Challenger/Mustang engines

[hemidup]

Originally Posted by Jeff Teuton

The Mopar motors are 6.1 Hemi, 5.7 Hemi, and 5.9 Magnum Wedge. They are done by Gary Stanton Racing and are really nice stuff. They are all standard bore and non stroked cranks. I have one 6.1 apart, and my first 5.9 is being built now. The contents are really good stuff and preminum blocks, cranks, pistons, rods. etc. I think the 6.4 (392) is in the wings for racing as well as production. That motor has been around for over 5 years as Arrow Racing did one that far back. The good heads hit production in the 2008 SRT cars, and then all the Hemi motors in 2009. Just have to wait on all these new cars (Fords & Mopars) to see how bad they get beat up by the participants.

Actually Jeff, the heads that come on the DP 5.7 and 6.1 engine's are the same 6.1 castings which were available since 2005. The only difference is the DP heads have stainless steel 2.10" int/1.60" exh valves vs the OEM sodium filled 2.08" int/ 1.60" exh valves. Why they did that? I have no clue cause I've seen some performance loss with the larger non OEM intake valve. In 09 they changed the design of the 5.7 heads from previous years. Its a 66cc closed chamber design with 2.05" int/1.55" exh valves with square 6.1 intake and D shaped exh ports vs the older 5.7 with .052" quench pads, 85cc open chamber with 2.00" int/ 1.55" exh valves, rectangle intake port and square shaped exh ports. Out of the box, both the newer 5.7 and 6.1 heads flow 300 cfm @ .600" lift. The older 5.7 heads flowed 270 cfm @ .600" lift. However, air speed of the older 5.7 head is much faster than the newer designed 5.7 head or the 6.1. It'll be interesting to see if and when Dodge releases the 392. I heard the Ram trucks might get them first? idk. I've been hearing about it the 392 for the past few years and got tired of waiting so I built my own.