Re: How much power can a 426 Hemi make?
[Re: Pale_Roader]
#338455
06/05/09 08:51 AM
06/05/09 08:51 AM
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Joined: Jan 2003
Posts: 2,763 Walton's Mountain, Pa
Steve1118
master
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master
Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
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For what its worth, mine makes a shade over 600 with old iron heads, old school TRW pistons, NASCAR rods, and a .640 lift roller, with a cross ram and two Holley 660's. Stock stroke, 434 inches, 6600 rpm. Far from exotic, it is basically a SS engine from the sixties, with a little less camshaft (most of them used old R296 Cranes)and smaller carbs.
With newer stuff, 700 hp is pretty easy.
"Old age and treachery trumps youth and enthusiasm, every time!" East Central Director / Chrysler Power Magazine www.reasbeckracing.webs.com
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Re: How much power can a 426 Hemi make?
[Re: Steve1118]
#338456
06/05/09 12:49 PM
06/05/09 12:49 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
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DFW
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The top SS Hemi engines are making more than 900 HP. They actually are slightly larger due to overbore, but are still 438-440 CID. I think a 426 Hemi with newer heads like a Millenium head and all the tricks and no port limitations and bigger carbs could get up to around 1000 HP, but that would be a guess on my part. I was told a CW Hemi engine runs upward of $75k, so that's well out of my price range (about 3X).
Floyd Lippencott IV
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Re: How much power can a 426 Hemi make?
[Re: Steve1118]
#338457
06/05/09 12:55 PM
06/05/09 12:55 PM
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Joined: Dec 2005
Posts: 293 Kansas City Metro
mbogina
enthusiast
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enthusiast
Joined: Dec 2005
Posts: 293
Kansas City Metro
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815Hp, 640TQ, 438 ci, 1970 casting iron heads w stock valve sizes, 11.3 compression, 2-625 Carter carbs, good intake, aggressive roller cam, 2.25 headers, mid 1990's technology.
Be a Rebel- Break the Laws of Physics!
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Re: How much power can a 426 Hemi make?
[Re: mbogina]
#338458
06/05/09 05:47 PM
06/05/09 05:47 PM
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Joined: May 2004
Posts: 12,414 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
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Taxes & Virus's R-US, NY
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Quote:
815Hp, 640TQ, 438 ci, 1970 casting iron heads w stock valve sizes, 11.3 compression, 2-625 Carter carbs, good intake, aggressive roller cam, 2.25 headers, mid 1990's technology.
Yup, 800hp is pretty attainable with good heads on a 426 + 0.030" over. I was making in excess of 600hp with my first 426 hemi...The heads are the key, and you can spend as much as you want in that area. Best heads for it are Stage V Millenium heads at that level or RBRE SS heads which are Stage V anyways....
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Re: How much power can a 426 Hemi make?
[Re: Dragula]
#338459
06/05/09 06:10 PM
06/05/09 06:10 PM
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Joined: May 2007
Posts: 1,087 Northeast, Arkansas
Dodgeman67
super stock
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super stock
Joined: May 2007
Posts: 1,087
Northeast, Arkansas
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Great thread guys, I was wondering the same thing.
I'm gathering parts for my 426 as we speak.
Here is what I have and yall tell me what kind of power it will make, or maybe what other parts I need.
I have a 426 MP block stock bore with a stock stroke crank, the MP aluminum heads, an older Weiand 2 - 4 tunnel ram intake that I will have to Ron's flying toilets alcohol injection, I have some Canadian roller rockers, 13.5 - 1 Venolia pistons, and some Keith Black aluminum rods.
What roller cam do I need to make the most power? I also have to buy lifters, pushrods, and valve springs, and maybe valves.
What header tube size do I need, and on these I plan to build a 540" short block later to put in the car under my current top end, so what header size will I need for it and I will build them now.
It's going in our racecar, no street driving.
With the right cam, what kind of power are we looking at?
Thanks
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Re: How much power can a 426 Hemi make?
[Re: Dragula]
#338460
06/05/09 06:14 PM
06/05/09 06:14 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
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Rock Springs
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I hope to squeeze out 800+Hp with the new engine which is a little bit bigger than a stock 426 engine. I really think to make good power with the the Hemi, the design really likes good cylinder pressure, and responds well to larger cams. Here is some flow numbers with today's technology. I'm hoping the added stroke and bore will lower the engines power band some, which will really make it a nice bracket engine that isn't killing its self every run with 7500-8000 rpm passes. http://www.moparmusclemagazine.com/techa...test/index.html^^^ Here is a great article on what can be expect out of a mild crate Hemi with just some bolt on parts. I bet the engine would pickup another 12-15% more in power if the compression was up there in the 12-13:1 range.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: How much power can a 426 Hemi make?
[Re: Dodgeman67]
#338461
06/05/09 06:51 PM
06/05/09 06:51 PM
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Joined: Jan 2003
Posts: 2,763 Walton's Mountain, Pa
Steve1118
master
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master
Joined: Jan 2003
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Walton's Mountain, Pa
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I couldn't give you a power figure....but it will be plenty.
I know absolutely nothing about Ron's toilets, and I have never used aluminum rods. I always found them a bit scary.
Everything I use is pre-historic, but I know it and it's reliable. Besides, I'm a dinosaur. Brother Bob told me so.
"Old age and treachery trumps youth and enthusiasm, every time!" East Central Director / Chrysler Power Magazine www.reasbeckracing.webs.com
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Re: How much power can a 426 Hemi make?
[Re: Steve1118]
#338464
06/05/09 08:40 PM
06/05/09 08:40 PM
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Joined: May 2005
Posts: 6,446 NJ-USA
HPMike
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master
Joined: May 2005
Posts: 6,446
NJ-USA
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Quote:
I couldn't give you a power figure....but it will be plenty.
I know absolutely nothing about Ron's toilets, and I have never used aluminum rods. I always found them a bit scary.
Everything I use is pre-historic, but I know it and it's reliable. Besides, I'm a dinosaur. Brother Bob told me so.
Steve: I have some of that old stuff in mine too. I run NASCAR rods and a 440 steel crank in my junk. But it runs great and has held together for quite some time now.
MB
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Re: How much power can a 426 Hemi make?
[Re: mbogina]
#338466
06/05/09 09:17 PM
06/05/09 09:17 PM
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Joined: Nov 2007
Posts: 406 Oregon,USA
RAT PATROL
mopar
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mopar
Joined: Nov 2007
Posts: 406
Oregon,USA
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Quote:
815Hp, 640TQ, 438 ci, 1970 casting iron heads w stock valve sizes, 11.3 compression, 2-625 Carter carbs, good intake, aggressive roller cam, 2.25 headers, mid 1990's technology.
This motor is incredible considering those parts! I wish you were closer Mike, I'd offer you a couple of for . The curve is a lot steeper than people think.
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Re: How much power can a 426 Hemi make?
[Re: RAT PATROL]
#338467
06/05/09 11:13 PM
06/05/09 11:13 PM
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Joined: Jan 2003
Posts: 7,498 Minnesota
Hemi_Joel
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master
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Minnesota
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F.A.S.T. Hemi's are getting 1.5 HP per CI with original heads, intake and exhaust manifolds, AFB carbs, and cams the idle smoothly. Take away any of those limitations, and a Hemi will really fly! Hemi's really love stroker cranks and big cams. If your building a hemi from scratch, there's no reason to stick with the little 3.75 crank, unless you are working within a set of rules that require it. The price ends up about the same for a stock or a stroker crank.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: How much power can a 426 Hemi make?
[Re: Hemi_Joel]
#338468
06/06/09 12:24 AM
06/06/09 12:24 AM
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Joined: Jul 2003
Posts: 12,129 Cleveland
sunroofgtx
I Live Here
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I Live Here
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Cleveland
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My 472 has heavy crate pistons and rods, but a 650 roller, massaged alum. Mopar heads, milled -3 Indy with a Dom, and its a very streetable 620, 535 at the rear. Very expensive on fuel, but idles @ 850 and loves 3500 rpm cruising. 10.75 compression. I agree , those numbers above are very nice. Wish I went with lighter pistons and a hair higher compression, but I love the cam. DT, I'd like to take your dyno-winner on a short ride with you.. Maybe at Carlisle.
Join the quickest team in motorsports. Team FireCore. CustomWiresets.com
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Re: How much power can a 426 Hemi make?
[Re: Hemi_Joel]
#338469
06/06/09 12:43 AM
06/06/09 12:43 AM
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Joined: Jan 2003
Posts: 8,849 poplar bluff mo.
toplescuda
I Whine
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I Whine
Joined: Jan 2003
Posts: 8,849
poplar bluff mo.
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im working on our 426 hemi stock stoke (kellog crank) and stock bore id really like to get a close guiess hp as to what it will make the combo is... stock stroke/bore alum rods stx-22 solid roller racer brown super stock grind (think it was 590/613 315 260@.50) something like that uncut raised port dual plug dick landy heads 11.5-compression (run on street) tunnel ram(weiand) with 2 1050 domnator carbs 2 inch header (i know lil on small side) balanced , msd-7,crank trigger so what would be a honest hp guiess based on what you guys know about hemis also what safe rpm limit with this combo?
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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Re: How much power can a 426 Hemi make?
[Re: sunroofgtx]
#338470
06/06/09 09:37 AM
06/06/09 09:37 AM
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Joined: Apr 2006
Posts: 729 Lebanon,IN
mr2performance
super stock
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super stock
Joined: Apr 2006
Posts: 729
Lebanon,IN
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Hey Rick, anymore info on your camshaft? I'm building a similar engine right now. Mike Roth
MR2PERFORMANCE RACE CARS
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Re: How much power can a 426 Hemi make?
[Re: Dragula]
#338472
06/06/09 12:36 PM
06/06/09 12:36 PM
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Joined: Apr 2007
Posts: 951 Temperance, MI
prochargedhemi
super stock
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super stock
Joined: Apr 2007
Posts: 951
Temperance, MI
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i made just shy of 800 hp with my 477 (4.15x4.28) stock block, callies crank, manley/barton rods, je pistons(12:1), stage V sr heads (light port/polish job) t&d/barton valvetrain, mopar performance x-ram (right outta the box, ports are tiny compared to the head) bone stock 68 hemi x-ram carbs(actually jetted 79's squared on all primary sides) bullet cam which is relatively small, made 797hp @6900 and 630 tq@5800 drive it on the street very often,uses alot of fuel but even with the turbo action j convertor its not a real handful
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