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How much power can a 426 Hemi make? #338454 06/05/09 08:10 AM 06/05/09 08:10 AM
Joined: Jan 2005 Posts: 4,862 the frozen wastes... Pale_Roader OP Swears too much
Pale_Roader OP Swears too much Joined: Jan 2005 Posts: 4,862 the frozen wastes...	Just curious. It seems to be getting easier to squeeze a solid 600HP from a non-stroked 440 these days with all the aftermarket heads out there. What about a hemi? How hard is it to make say, 700HP naturally aspirated with a stock stroke 426? A few guys i know say its as simple as cleaning up the heads, blueprinting the valvetrain and using a serious solid/solid roller cam and a good intake/exhaust set-up? How much power have hemi owners typically built for something driven on the street? What would a 700HP street 426 hemi be like? Technology has come a long way. And i've also wondered how much power the old 426 hemi stock cars made? We're always talking about this stuff here, the usual bench racin'... and no one has owned one, just figured i'd ask here and get some real input. I'm sure there are a few hemi owners/ex-owners here.

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
Joined: Jan 2003 Posts: 2,763 Walton's Mountain, Pa Steve1118 master
Steve1118 master Joined: Jan 2003 Posts: 2,763 Walton's Mountain, Pa	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

Re: How much power can a 426 Hemi make? [Re: Steve1118] #338456 06/05/09 12:49 PM 06/05/09 12:49 PM
Joined: Jan 2003 Posts: 3,504 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,504 DFW	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

Re: How much power can a 426 Hemi make? [Re: Steve1118] #338457 06/05/09 12:55 PM 06/05/09 12:55 PM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	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!

Re: How much power can a 426 Hemi make? [Re: mbogina] #338458 06/05/09 05:47 PM 06/05/09 05:47 PM
Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY	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.... '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: How much power can a 426 Hemi make? [Re: Dragula] #338459 06/05/09 06:10 PM 06/05/09 06:10 PM
Joined: May 2007 Posts: 1,087 Northeast, Arkansas D Dodgeman67 super stock
Dodgeman67 super stock D Joined: May 2007 Posts: 1,087 Northeast, Arkansas	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

Re: How much power can a 426 Hemi make? [Re: Dragula] #338460 06/05/09 06:14 PM 06/05/09 06:14 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	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]

Re: How much power can a 426 Hemi make? [Re: Dodgeman67] #338461 06/05/09 06:51 PM 06/05/09 06:51 PM
Joined: Jan 2003 Posts: 2,763 Walton's Mountain, Pa Steve1118 master
Steve1118 master Joined: Jan 2003 Posts: 2,763 Walton's Mountain, Pa	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

Re: How much power can a 426 Hemi make? [Re: Steve1118] #338462 06/05/09 07:40 PM 06/05/09 07:40 PM
Joined: Jan 2005 Posts: 4,862 the frozen wastes... Pale_Roader OP Swears too much
Pale_Roader OP Swears too much Joined: Jan 2005 Posts: 4,862 the frozen wastes...	Crazy stuff. So, despite all the recent developments in wedge head technology, the hemi is still a level above in potential? Even the older hemi heads? I'm no hemi expert, but the newer designs dont immediately look much different than the older ones. With the wedge heads, the difference is night and day. Sounds like a 700HP N/A street hemi wouldn't be too hard to build. Also, i meant the old stock cars, not the drag cars. What were those 70's stock cars making right before they got banned?

Re: How much power can a 426 Hemi make? [Re: Pale_Roader] #338463 06/05/09 08:33 PM 06/05/09 08:33 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Quote: Crazy stuff. So, despite all the recent developments in wedge head technology, the hemi is still a level above in potential? Even the older hemi heads? I'm no hemi expert, but the newer designs dont immediately look much different than the older ones. With the wedge heads, the difference is night and day. Sounds like a 700HP N/A street hemi wouldn't be too hard to build. Also, i meant the old stock cars, not the drag cars. What were those 70's stock cars making right before they got banned? Im sure Chuck Lofgren won the Hemi Challenge with a prep'd set of 68 stock Cast Iron Hemi heads, all other contestants were running Indy or Stage V heads. They also had the smallest engine of the contest too.. Here is a article. http://www.moparmusclemagazine.com/eventcoverage/mopp_0602_hemi_challenge_engine_build/index.html [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: How much power can a 426 Hemi make? [Re: Steve1118] #338464 06/05/09 08:40 PM 06/05/09 08:40 PM
Joined: May 2005 Posts: 6,446 NJ-USA H HPMike master
HPMike master H Joined: May 2005 Posts: 6,446 NJ-USA	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

Re: How much power can a 426 Hemi make? [Re: HPMike] #338465 06/05/09 09:12 PM 06/05/09 09:12 PM
Joined: Oct 2004 Posts: 3,097 back in Georgia dthemi master
dthemi master Joined: Oct 2004 Posts: 3,097 back in Georgia	A 700 HP "426" CI Hemi would be lots O fun on the street, but miserable to drive very far. A 500+ inch 700 HP hemi would be lots O fun too, but much nicer to drive around.

Re: How much power can a 426 Hemi make? [Re: mbogina] #338466 06/05/09 09:17 PM 06/05/09 09:17 PM
Joined: Nov 2007 Posts: 406 Oregon,USA R RAT PATROL mopar
RAT PATROL mopar R Joined: Nov 2007 Posts: 406 Oregon,USA	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. 5275179-RATPATROL.JPG (865 downloads)

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
Joined: Jan 2003 Posts: 7,477 Minnesota Hemi_Joel master
Hemi_Joel master Joined: Jan 2003 Posts: 7,477 Minnesota	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"

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
Joined: Jul 2003 Posts: 12,129 Cleveland sunroofgtx I Live Here
sunroofgtx I Live Here Joined: Jul 2003 Posts: 12,129 Cleveland	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

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
Joined: Jan 2003 Posts: 8,844 poplar bluff mo. T toplescuda I Whine
toplescuda I Whine T Joined: Jan 2003 Posts: 8,844 poplar bluff mo.	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

Re: How much power can a 426 Hemi make? [Re: sunroofgtx] #338470 06/06/09 09:37 AM 06/06/09 09:37 AM
Joined: Apr 2006 Posts: 729 Lebanon,IN M mr2performance super stock
mr2performance super stock M Joined: Apr 2006 Posts: 729 Lebanon,IN	Hey Rick, anymore info on your camshaft? I'm building a similar engine right now. Mike Roth MR2PERFORMANCE RACE CARS 765 483 9371

Re: How much power can a 426 Hemi make? [Re: toplescuda] #338471 06/06/09 12:22 PM 06/06/09 12:22 PM
Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,383 Taxes & Virus's R-US, NY	I had a similar sized cam in my +0.030" 426 and a tunnel ram with 11.6:1 compression, and it was between 585hp and 625hp with unported Indy heads. The head flow numbers will get you a better guess. If DLI is still around, give them a call and find out right from them. The 800hp number I quoted was from a Barton SS motor single 4bl with 12.5:1 compression and a nasty cam not attainable without line boring the cam journals out. The heads they said had almost a full 40hrs of porting into them according to the article. Basically his SS heads on a milder motor for bracket racing. Every point of compression is about 70-80hp on one of these motors. '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: How much power can a 426 Hemi make? [Re: Dragula] #338472 06/06/09 12:36 PM 06/06/09 12:36 PM
Joined: Apr 2007 Posts: 951 Temperance, MI P prochargedhemi super stock
prochargedhemi super stock P Joined: Apr 2007 Posts: 951 Temperance, MI	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

Re: How much power can a 426 Hemi make? [Re: prochargedhemi] #338473 06/06/09 04:18 PM 06/06/09 04:18 PM
Joined: May 2007 Posts: 1,087 Northeast, Arkansas D Dodgeman67 super stock
Dodgeman67 super stock D Joined: May 2007 Posts: 1,087 Northeast, Arkansas	Here is my other block with the top end sitting on it. You know these hemis are pretty dang big.

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