Posted By: 67coronetman
426 Hemi build want 600-650 hp any ideas. - 12/11/11 04:02 AM
My friend is building a 426 hemi with stock stroke & only .030 over mild head work & intake to match the heads running a solid lift cam with ross pistons & manley rods what i want to know who out here can give real hemi combos that you have built that was still streetable on pump gas. We have the hemi books we wnt real world answer from you out here that have done it thanks for looking & any help.
Posted By: astjp2
Re: 426 Hemi build want 600-650 hp any ideas. - 12/11/11 04:17 AM
Contact Tim Banning at For Hemi's Only. Get his CNC ported stageV heads, Have him match the stageV intake, Roller cam, lifters with pushrod oiling, aftermarket roller rockers per his recommendations. Good Oiling system. I am building a 572 that runs on 85 octane and it will get around the same horsepower. Tim
Posted By: autoxcuda
Re: 426 Hemi build want 600-650 hp any ideas. - 12/11/11 05:09 AM
Troy built a 472 with E-brock (MP) aluminum heads that very streetable. It's a Comp custom flat tappet with 112 centerline. He runs it with a Cross ram and 68 holley super stock carbs.
Starts awesome. I went with a 40 mile round trip with him today in it.
Here's video of it running. It's got cheapy glasspacks on it that dump down before the axle (as S/S where delivered that way).
**Note from the videos inside the car that it has NO factory undercoating and NO seam sealer at all and NO backseat and just a thin carboard trunk divider. Also does not have aircleaners or even hood in videos. Without the rear seat you get a lot of trunk and undercar noise. Especially with no undercoating and seam sealer.
http://www.youtube.com/watch?v=TDUcTidxlpghttp://www.youtube.com/watch?v=H9tYaB_D98Qhttp://www.youtube.com/watch?v=tIrU5pen-54http://www.youtube.com/watch?v=DzCXe5fk3Sc
Posted By: Dragula
Re: 426 Hemi build want 600-650 hp any ideas. - 12/11/11 05:19 AM
Mine is well over +700 on pump gas, but the cam I use can be a pain in the a$$ on parts and its +.060 and a 4.15 stroke. My heads flow right around 400cfm, and it makes the hp and the torque, just the spring pressures can be a pain.
My engine builder has one that is 657hp and is street driven runs 11.1s in a very heavy street car on drag radials and has a very mild cam, good flowing heads, and we have been kicked off the track for only having a lap belt and going over 122mph on that 11.1 pass. It is also a 4.15 stroke crank motor displacing 477 cubes.
My only 426 +.030 made about 580-590hp and was very streetable. The best street intake we have tested to date is the Ray Barton single plane...and around a 950 carb. The cam and heads will cost more than the stroker crank to make the hp and torque your looking for. I suggest going the stroker route....
Posted By: 3ddart
Re: 426 Hemi build want 600-650 hp any ideas. - 12/12/11 03:39 PM
get hold of rich @ firecore wires (a moparts member and sponser) and get his combo and info. his car is close to 4000 lbs and he was clicking off 10.85s at norwalk this year @ the mopar event. i can't give you #s on mine but desk-top dyno said 625 hp. that's a .020 over 426 with stock stroke, mp alum heads with port clean up only with a crane hyd roller with 564 lift intake 555 lift exhaust (advertised lift, i got a little more with different ratio rockers), duration is 236 int and 240 ex @ 50. small 2" hedman headers with a new mp crossram and 2 holley 770 carbs. starts easy and other then idleing a bit high (900 rpm) it runs and drives nice. i but 450 miles on it from aug to oct and had very few issues. even got 9 mpg if i kept my foot out of it. most guys tend to think on a street car a single carb will make more hp. dave
Posted By: 67coronetman
Re: 426 Hemi build want 600-650 hp any ideas. - 12/12/11 05:39 PM
Thanks for the info this is what i am looking for my firend ( DON"T ) have the free cash to stroke it so he is leaving it all factory specs and getting the power other way but yet keeping the comp down for street gas i know someone out here has built one with all the motor parts i find it hard not to.!!
Quote:
get hold of rich @ firecore wires (a moparts member and sponser) and get his combo and info. his car is close to 4000 lbs and he was clicking off 10.85s at norwalk this year @ the mopar event. i can't give you #s on mine but desk-top dyno said 625 hp. that's a .020 over 426 with stock stroke, mp alum heads with port clean up only with a crane hyd roller with 564 lift intake 555 lift exhaust (advertised lift, i got a little more with different ratio rockers), duration is 236 int and 240 ex @ 50. small 2" hedman headers with a new mp crossram and 2 holley 770 carbs. starts easy and other then idleing a bit high (900 rpm) it runs and drives nice. i but 450 miles on it from aug to oct and had very few issues. even got 9 mpg if i kept my foot out of it. most guys tend to think on a street car a single carb will make more hp. dave
Posted By: 666
Re: 426 Hemi build want 600-650 hp any ideas. - 12/12/11 05:40 PM
From asking around my house hold on the hemi builds the conclusion was to purchase a longer stroke crank shaft. By using a bigger cubic inch motor you would only have to produce around 1.2 HP per cubic inch compared to 1.45 HP per cubic inch with a 426 cubes.This is a camparision of 426 CI to 500 CI. By making the motor even bigger this number could drop down near 1.1 HP per Cubic inch. One Hemi motor in the house hold is much like you have suggested 426 CI with a 30 over and a mild 580 solid lifter came shaft. It needed a lot more compression to produce the Power over 650 HP and also has to be spun much higher in the RPM range to produce this. Also suggested was to go with different Heads than stock cast irons heads if you plan on making the motor bigger. Stage V was the choice here and if you go that direction then porting is recommended and then performance intakes are the next step. If the car is NOT some OEM Gold trailer queen ,build a Hemi Motor that can have changes added to it for more horse power in the future. Stock Cast Iron sometimes limits this with new Technology in the future from Aftermarket sources.Also with bigger cubic inch Hemis it takes less compression to produce your wanted HP motor making the motor more livable on the street with gas out of the Pump.
Posted By: DANA60
Re: 426 Hemi build want 600-650 hp any ideas. - 12/13/11 10:57 PM
This one dynoed at 670 @ 6000 on pump gas. 525 stroker, marine intake, 750 Holleys (600 bowls for fit), Stage V heads, Engle K-8 Hyd (248 @50, 586 lift), callis bottom end, ross 10.5-1 60 over.
Posted By: DPelletier
Re: 426 Hemi build want 600-650 hp any ideas. - 12/13/11 11:32 PM
I would tend to think it would be pretty hard to get 600 - 650hp out of a stock stroke street hemi while still being streetable and able to run on pump swill. A factory race hemi grossed out in the 550ish range with headers IIRC.
I think your friend needs to;
- pony up and stroke it
- give up being streetable and pump gas friendly
or
- lower hp expectations to something more reasonable; maybe 500 - 550hp
Dave
Posted By: 67coronetman
Re: 426 Hemi build want 600-650 hp any ideas. - 12/14/11 02:06 AM
If he could he would.!
I just don't see how he can't get that hp. ?? i have a 440 stock stroke .040 over stock crank & rods with cheap kb pistons & Indy SR head with a very mild port job M-1 intake no port work at all & 950 carb with a solid lift cam 282/292 & 540/559 lift with 1.6 Indy roller rockers & TTI headers and i am making 580 hp & Tq at the same & i had it Dynoed so its not a guess HP motor.!
*** So you are saying a hemi with better heads & bigger Valves better rod & pistons and a roller cam set up and head work & intake work with good headers won't out do mine. ?? ***
Quote:
I would tend to think it would be pretty hard to get 600 - 650hp out of a stock stroke street hemi while still being streetable and able to run on pump swill. A factory race hemi grossed out in the 550ish range with headers IIRC.
I think your friend needs to;
- pony up and stroke it
- give up being streetable and pump gas friendly
or
- lower hp expectations to something more reasonable; maybe 500 - 550hp
Dave
Posted By: 3ddart
Re: 426 Hemi build want 600-650 hp any ideas. - 12/14/11 03:37 PM
67 coronetman: dragula is right as far as paying the piper, no free lunch, lol. if you compare the cost and work involved to get it through heads or cam (i had hours in clearencing the pushrod holes for the hyd roller) to the cost of a stroker crank and balancing, the crank is the way to go. i had my bottom end when i started the build so i used what i had . i did as much of the complete project myself as i could (it took me 9 years) so cost was a big factor and since it was going to be mainly a street car whatever hp it made was ok with me. that being said if i was doing it again i would go stroker and sell the standard crank and would make more power at a slight increase in price. dave
Posted By: domingo
Re: 426 Hemi build want 600-650 hp any ideas. - 12/14/11 04:30 PM
start with a megablock if possible, and a stroker crank 4,25" with small journal chevy rods and small pins.
You can build a 540 that way, or something a bit smaller if you decide not to max out the bore on the block.
Get some stage V cnc ported stock replacement heads.
Stock vanke ported intake manifold or a stage V dual inlive intake.
dual edelbrock carbs.
10,5: compression.
You can achieve what you want with a solid flat tappet cam, or maybe if you can go for a mild roller.
Posted By: 67coronetman
Re: 426 Hemi build want 600-650 hp any ideas. - 12/14/11 11:11 PM
The ace i have in the hole is i have a good friend that has ported heads for yrs & worked for a mopar shop that builds hemi alot so the head work & intake port work will cost less than half of what it would cost. And he plans on running a solid roller cam set up will keep you all posted as to how it turns out.
Quote:
67 coronetman: dragula is right as far as paying the piper, no free lunch, lol. if you compare the cost and work involved to get it through heads or cam (i had hours in clearencing the pushrod holes for the hyd roller) to the cost of a stroker crank and balancing, the crank is the way to go. i had my bottom end when i started the build so i used what i had . i did as much of the complete project myself as i could (it took me 9 years) so cost was a big factor and since it was going to be mainly a street car whatever hp it made was ok with me. that being said if i was doing it again i would go stroker and sell the standard crank and would make more power at a slight increase in price. dave
Posted By: jon01
Re: 426 Hemi build want 600-650 hp any ideas. - 12/14/11 11:20 PM
I'm surprised nobody has suggested some kind of forced induction.
8:1, F1 ProCharger and alcohol injection should give you an easy 650hp on pump gas with a very mild cam and nice driveability.
Posted By: 67coronetman
Re: 426 Hemi build want 600-650 hp any ideas. - 01/04/12 01:54 PM
Posted By: 67coronetman
Re: 426 Hemi build want 600-650 hp any ideas. - 01/04/12 07:33 PM
Posted By: Slipknot440
Re: 426 Hemi build want 600-650 hp any ideas. - 01/04/12 08:46 PM
I was in the same boat about 3 years ago. I wanted 600+ but I wanted to be able to drive it too. I took the drive it option: stock bore, stock stroke, 9:1 pistons, iron block, iron heads, roller cam, cast manifolds, curved distributor with a race carb made 511 hp, my crappy 750 holley made 498 hp. 600+hp is great if you line up with all the high-end new muscle but think about all the extras that come with that much power...i.e. more money into the trans, frame twist, rear end etc. Those were the extra choices that kept me with a semi stock hemi as opposed to a 600+ street killer
