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Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 12-18-2010, 09:38 AM
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Default gen III vs gen IV heads

I'm looking to find as much info as possible to compare the gen 3 vs the gen 4 heads. Everything from casting, port design, cfm #s, and volume.

Anyone know of any sites where I can read up on this?
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Old 12-18-2010, 10:15 AM
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Mind if I ask the reason? This is just a friend stepping in, saying if you're thinking about using Gen III heads on a Gen IV, don't do it brother... Gen IV MUCH better...
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Old 12-18-2010, 10:31 AM
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I'm shopping some CnC'd heads and the heads below are gen 3 but I really want some ported and polished gen 4. My truck is my daily driver so I can't pull mine and send them off to a shop and not have my truck for a week.

http://www.shophemi.com/p-1877-57-he...s-phase-6.aspx (was told these are gen 3 heads)
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Old 12-18-2010, 10:45 AM
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Here is some info I found:

2004 Hemi specs:
Compression Ratio 9.6:1
Combustion chamber volume 84.9cc
Intake valve angle 18 degrees
Intake valve head diameter 50.8mm, 2.00 inches
Intake valve lift: 0.472
Exhaust valve angle 16y.5 degrees
Exhaust valve head diameter 39.4mm, 1.55 inches
Exhaust valve lift: 0.460
Valvesprings: Conical, 97 pounds closed, 242 pounds @ max lift

The 2 inch ports flow 270 cfm at .600 inches of lift, with peak flow at .375 inches. At .250, the stock head also had excellent flow. The exhaust port hits 161 cfm at .600 lift, with a 1.55 inch valve.



The 2009 Hemi brought variable cam timing; a higher compression ratio; higher-flowing heads, intake, and exhaust; and an active intake manifold that switches from long runners to short runners, to optimize the engine for either better high-end horsepower or better low-end torque. Other upgrades are crankshaft structural upgrades, a dual-mass crankshaft damper, floating pin piston design, valve spring design, and oil pump capacity increase.

Cylinder heads. Big changes here, new closed chamber heads have smaller chambers than previous engines , 66.3cc in fact vs 84.9cc. Even smaller than the 6.1's with 73.0cc. Bolting these on to a previous Hemi without modification would result in nearly a 12:1 compression ratio. Valves are slightly larger. Intake is 2.05" vs 2.00". Exhaust is the same. Both valves have a longer stem though. New bee hive valve springs, identical on both intake and exhaust are now in use, and seem to mimic what some have been doing in using the 6.1 exhaust springs across all valves. Pushrods have changed as well, they are now approximately 4mm longer, putting them very close in length to the 6.1's pushrods. Ports appear to have a 6.1 sized window on the intake side, as well as a 6.1 style D shape on the exhaust. A quick comparison with a 6.1 exhaust manifold looks like it was nearly a perfect match.

Active intake manifold on the 2009 and up Rams:

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Old 12-18-2010, 10:46 AM
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Quote:
Originally Posted by gabrieldy View Post
I'm shopping some CnC'd heads and the heads below are gen 3 but I really want some ported and polished gen 4. My truck is my daily driver so I can't pull mine and send them off to a shop and not have my truck for a week.

http://www.shophemi.com/p-1877-57-he...s-phase-6.aspx (was told these are gen 3 heads)
Talk to Dave DiMarco there, he'll set up. Those are supposed to be the Gen IV heads (anything with the codename "Eagle" is referring to the Gen IV Hemi).
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Old 12-18-2010, 11:14 AM
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Awesome! that is pretty much all the info I was looking for. I'm new to HEMIs as I've been wrenching on mustangs up until I bought my truck last year. Really glad I did to btw. Way more power and all around value. I was talking to Don and he is supposed to call me back Monday so I'll mention some of this and about the "eagle" heads.

still trying to decide on the cam....theirs or the Comp 260H. trying to stick with a mild cam.
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Old 12-18-2010, 11:33 AM
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Cool! Looking forward to what you come up with.
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Old 12-18-2010, 02:00 PM
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very informative, thank you
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Old 12-18-2010, 02:04 PM
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very nice daniel
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Old 12-18-2010, 02:48 PM
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Hemi: (HEM -e) adj. Mopar in type, V8, native to the United States, carnivorous, eats primarily Mustangs, Camaros, and Corvettes. Also enjoys smoking a good import now and then to relax. - David Charles Gedraitis

I am not sure this is exactly want you are looking for, but, there is a load of information on the HEMI both older & newer, 5.7 & 6.1, several measurements are included
http://www.allpar.com/mopar/new-mopar-hemi.html
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