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Re: What set of 426 Hemi heads to buy for street & strip? [Re: rowin4] #1762836
02/27/15 03:27 AM
02/27/15 03:27 AM
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A 350 cfm head should make 700 to 725 hp.
That is with a well-matched system.

R.

Re: What set of 426 Hemi heads to buy for street & strip? [Re: blowndart] #1762837
02/27/15 12:59 PM
02/27/15 12:59 PM
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Marion, South Carolina [><]
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Quote:

Quote:

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If you think you can't afford the Stage V heads, wait till you price the rocker arm assembly. There is nothing not expensive for a Hemi, even used parts. Now is the time to think over what you want to do, next thing you'll be thinking is : WHAT THE HELL WAS I THINKING!!!!!



That's true for the most part, but if you're patient you can find some deals for hemi parts occasionally. I bought some new K1 billet hemi rods for $130 and some new MP forged 528 pistons for $200 last year. The cranks are the same as a 440 crank and those aren't too bad. I paid $350 for a new Eagle 4340 4.15" crank a couple of years ago off ebay. Now finding a block for a reasonable price, that's tricky.



Finding used/cheap cranks, rods, & pistons isn't hard. It's the topend parts that are pricy for a hemi...even used stuff. Heads, rocker assemblies, and blocks are the 3 main pieces that you will pay for.



All of the parts and prices I listed were for new parts, not used. I agree there is no cheap way out for the rocker setup or block. I don't think the heads are too bad for the flow #s. I don't know of too many wedge heads that flow up to 400 CFM for $2300.



Blowndart...All I was implying is that other than the block, the bottom end of a hemi really costs no more than a wedge.

The heads ARE priced very reasonably to a wedge when you compare flow numbers.

As far as blocks....right now I think your only options for a new one are Keith Black or Indy, both aluminum.
I'm not sure if you can actually get one from HP Performance right now?
Older Mega Blocks and World blocks pop up from time to time but they are expensive since no one is making them anymore.

I never heard of the Stage V heads dropping seats? Not arguing, I just don't recall ever hearing that. I know some of the MP heads had that issue. W/ that said, I have MP heads on my 572 hemi...no problems and I've been running them since 2006. The MP heads are basically just aluminum versions of the factory iron heads. CNC ported by MCH they flow 430 cfm.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: What set of 426 Hemi heads to buy for street & strip? [Re: an8sec70cuda] #1762838
02/27/15 02:48 PM
02/27/15 02:48 PM
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Bend,OR USA
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Some of the early Mopar brand aluminum race D series hemi heads had valve seat problems and I think some of the early aluminum Mopar brand heads, maybe they where Canfields, had porisity problems also, didn't they Hemi = $$$$ Hemi, AKA, Hemiroids As far as which heads I would buy the Stage V if I wanted the most performance, if not go with the Eddy as far as the rocker arms the stock Mopar OEM ductile iron rockers can and do vary a ton on the ratios from the factory, a ton Been there, done that I saw .080 on the exhaust rockers and .130 differences at the valve retainers on the net lift on intake rockers when I raced a Street Hemi in NHRA stock class years ago That was using the same lifters and cylinder head on one side of the motor setting the valve lash at zero with light checking springs, change the rocker assembly( I had three sets back then) and set them up the same and measure off of the retainers

Last edited by Cab_Burge; 02/27/15 02:58 PM.
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Cab_Burge] #1762839
02/27/15 07:56 PM
02/27/15 07:56 PM
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fredericksburg,va
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Whats the though on the stock head, what will it flow, stock and mildly ported. Can it make 650-700 hp with some cubes, say over 500?

Re: What set of 426 Hemi heads to buy for street & strip? [Re: cudaman1969] #1762840
02/27/15 08:02 PM
02/27/15 08:02 PM
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Odessa, Fl
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Quote:

Whats the though on the stock head, what will it flow, stock and mildly ported. Can it make 650-700 hp with some cubes, say over 500?



Yes they can.

Re: What set of 426 Hemi heads to buy for street & strip? [Re: blowndart] #1762841
02/27/15 08:17 PM
02/27/15 08:17 PM
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It isn't the cubic inches, it's the heads' flow and how tight you're willing to turn the engine.

IIIRC there was a flow test published years ago, in some Chrysler magazine, where someone and it may have been Dvorak, flow tested a bunch of heads, then put a set of stock Hemi heads on the flowbench just for fun. I seem to remember the stock Hemi head flowing around 305cfm on the intake port, which should be good for 600 - 630 hp. But how tight do you have to spin a 426 to make the power?

That's why I say the Hemi heads needed a much larger shortblock under them to really work
Back in the day, when Hemi and 440-6 were both being produced, on of my favorite car mags of the time road tested a Hemi and a 440-6 version of the same car. The Hemi was running 3.54s, the 440-6 had 3.91s. The 440-6 was quicker than the Hemi in the quarter, which surprised the writers.
Now put a 500 cubic inch shortblock under the Hemi heads and it should kill everything with a stock head, and I mean everything.

With the numbers I have seen here, my recommendation would be to buy the Edelbrock or MP versions of the heads. Build the biggest shortblock you can afford. Then, if you need more power down the road, have the heads you have ported. There should be at least another hundred hp in that, maybe more.

I give this advice with the knowledge that I just bought a used car for daily driver that cost about as much as a set of Hemi rocker arms, shafts and whatever else they need to be usable.

R.

Re: What set of 426 Hemi heads to buy for street & strip? [Re: dogdays] #1762842
02/27/15 10:46 PM
02/27/15 10:46 PM
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Odessa, Fl
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Quote:



IIIRC there was a flow test published years ago, in some Chrysler magazine, where someone and it may have been Dvorak, flow tested a bunch of heads, then put a set of stock Hemi heads on the flowbench just for fun. I seem to remember the stock Hemi head flowing around 305cfm on the intake port, which should be good for 600 - 630 hp.
R.




Either you are not remembering correctly, there was something wrong with the flow bench or there was something was wrong with that head. Stock heads with a good valve job should top out at 330-350 CFM. The heads on my car currently are unported factory iron heads from 1968 and on a 12:1 compression, roller cam 426 engine it was running mid to low 9's. Dvorak went through my heads prior to bolting them back on. This site has some head flow data for various heads including hemis http://www.mopar1.us/flow2.html

Re: What set of 426 Hemi heads to buy for street & strip? [Re: blowndart] #1762843
02/28/15 03:04 AM
02/28/15 03:04 AM
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My engine guy has a set of edelbrocks this week he was working on. Valve guide were too tight. I asked him what he thought of them and said you shouldn't have to do this to new heads

Re: What set of 426 Hemi heads to buy for street & strip? [Re: billohio] #1762844
02/28/15 12:27 PM
02/28/15 12:27 PM
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My engine guy has a set of edelbrocks this week he was working on. Valve guide were too tight. I asked him what he thought of them and said you shouldn't have to do this to new heads



Did he say what the clearance was? I was planing to have mine checked before using them because I'm changing the springs for my cam anyways. This is not the first I've heard of Edelbrock heads in general being a little tight. That's not a deal beaker to me though. Much less to correct for being too tight then too loose .

Re: What set of 426 Hemi heads to buy for street & strip? [Re: blowndart] #1762845
02/28/15 01:23 PM
02/28/15 01:23 PM
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Taxes & Virus's R-US, NY
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Blah...blah blah blah...I have not seen any numbers posted of the Eddy heads to answer my question, so here are my new Indy Hemi heads....Its all BS until you post numbers....




Last edited by Dragula; 02/28/15 01:27 PM.

'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: What set of 426 Hemi heads to buy for street & strip? [Re: Blakcharger440] #1762846
02/28/15 03:17 PM
02/28/15 03:17 PM
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Bend,OR USA
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Quote:

Quote:

that's a loaded question, be prepared for a load of answers!

this is where the money is on a hemi, the heads and the valve train.

it depends what kind of HP you are looking for. you can put an ootb set of mopar or now edelbrock heads on, and they will make for a decent package, but nowhere near what a hemi can do.

a ported set of stage V heads are the way to go imho.




I would like to make about 700-750HP or a little more.


I have built and dyno tested more than one pump gas 426 Street Hemi motor, that said, the better heads make more power per C.I. on the same fuel The last two street hemi motors I built and dyno tested for the same customer in SO CA made 630 HP, 471 C.I. 10.25 to 1 comp. ratio,4.310 bore with a 3.91 stroke,(all new Mopar parts OOTB, he was a lawyer and had a little money ) with the new cast iron OOTB Mopar replacement heads checked and prepped for street use, stock OEM inline 2x4 intake manifold with a set of OEM Carter 1966 street hemi carbs,I did a little tuning on it, not a bunch His other motor was a 526 C.I. with all new Mopar parts, 4.380 bore x 4.250 stroke, used Mopar D4 aluminum heads and a used OEM alumunim SS cross ram intake and new Holley Replacement carbs 11.3 to 1 comp. ratio for 91 octane CA pump gas. Stock rocker arm sets he had on both motors, not blue printed or having the rocker ratio corrected It made 680 HP They, both motors, had custom ground solid lifters, not rollers, street cams in them. I was really disappointed with that motor He wasn't Your deal with that C.I. and a decent set of new Stage V heads and rockers should to make north of 750 HP with two carbs really easy IHTHs Let us know what you decide


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Cab_Burge] #1762847
02/28/15 09:55 PM
02/28/15 09:55 PM
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Utah and Alaska
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Cab, did you pick out these combination of parts or did the owner? You could have suggested that he do it right if was going to do it at all. That is why I dropped the stock rockers and I have a roller cam with pushrod oiling. My biggest mistake was only 9.5-1 compression but I got a super deal on the pistons so I am hoping that I can run on any 85 octane gas, NOT E-85. Tim

Quote:

Quote:

Quote:

that's a loaded question, be prepared for a load of answers!

this is where the money is on a hemi, the heads and the valve train.

it depends what kind of HP you are looking for. you can put an ootb set of mopar or now edelbrock heads on, and they will make for a decent package, but nowhere near what a hemi can do.

a ported set of stage V heads are the way to go imho.




I would like to make about 700-750HP or a little more.


I have built and dyno tested more than one pump gas 426 Street Hemi motor, that said, the better heads make more power per C.I. on the same fuel The last two street hemi motors I built and dyno tested for the same customer in SO CA made 630 HP, 471 C.I. 10.25 to 1 comp. ratio,4.310 bore with a 3.91 stroke,(all new Mopar parts OOTB, he was a lawyer and had a little money ) with the new cast iron OOTB Mopar replacement heads checked and prepped for street use, stock OEM inline 2x4 intake manifold with a set of OEM Carter 1966 street hemi carbs,I did a little tuning on it, not a bunch His other motor was a 526 C.I. with all new Mopar parts, 4.380 bore x 4.250 stroke, used Mopar D4 aluminum heads and a used OEM alumunim SS cross ram intake and new Holley Replacement carbs 11.3 to 1 comp. ratio for 91 octane CA pump gas. Stock rocker arm sets he had on both motors, not blue printed or having the rocker ratio corrected It made 680 HP They, both motors, had custom ground solid lifters, not rollers, street cams in them. I was really disappointed with that motor He wasn't Your deal with that C.I. and a decent set of new Stage V heads and rockers should to make north of 750 HP with two carbs really easy IHTHs Let us know what you decide




1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: What set of 426 Hemi heads to buy for street & strip? [Re: astjp2] #1762848
03/01/15 02:25 AM
03/01/15 02:25 AM
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That customer had bought out a Dodge dealership that was closing inventory of Mopart Hi Po, he supplyed th eparts and I had tnem machined and blueprinted the motors for him. He had a ton of Mopar parts and cars, I really wanted to build him several 383 blocks with 4.250 stroke cranks and some good heads, smoke them Hemis He had several 1971 383 R/T Challengers


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Cab_Burge] #2896003
03/05/21 11:44 AM
03/05/21 11:44 AM
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Is it OK to restart this thread (please)?

As a hemi newbie I’m perplexed by MP hemi heads?
I have an older MP head and a newer MP head which is a M head.
They are slightly different outside and very different inside lol.
The exhaust port is obviously revised and larger.
I have opened up the earlier head to mimic it (as best as poss).

This is what happens when projects take decades instead of years lol...


Now I see the M2 is in circulation now!

What’s the story on these babies? help

Last edited by Gtxxjon; 03/05/21 11:46 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Gtxxjon] #2896111
03/05/21 03:46 PM
03/05/21 03:46 PM
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S.E. Michigan
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Zombie thread alert!

Maybe this will help solve some of the mystery.

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2673609/1.html


Rich H.

Esse Quam Videri




Re: What set of 426 Hemi heads to buy for street & strip? [Re: ZIPPY] #2896359
03/06/21 06:44 AM
03/06/21 06:44 AM
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Many thanx Zippy!

Not really a Zombie yet, just dead from the head down from a year of isolation... realcrazy

The problem is buying stuff in singles 'as and when you can afford them'.
Should always save up faster and buy a PAIR of heads so if they have issues then they both have issues... blah

Got a pile of wrecked hemi stuff here that I've collected for 35 years from failed projects and loose rod bolts etc... fan



Anyways, folks who venture into the mysterious world of 'Hemi', please expect to be 'poor and puzzled' with equal amounts... panic

I know I am, I spent more on two HEMI heads and valve gear than I spent on whole 440 engines...

Last edited by Gtxxjon; 03/06/21 06:47 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Gtxxjon] #2896394
03/06/21 09:49 AM
03/06/21 09:49 AM
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Originally Posted by Gtxxjon
Many thanx Zippy!

Not really a Zombie yet, just dead from the head down from a year of isolation... realcrazy

The problem is buying stuff in singles 'as and when you can afford them'.
Should always save up faster and buy a PAIR of heads so if they have issues then they both have issues... blah

Got a pile of wrecked hemi stuff here that I've collected for 35 years from failed projects and loose rod bolts etc... fan



Anyways, folks who venture into the mysterious world of 'Hemi', please expect to be 'poor and puzzled' with equal amounts... panic

I know I am, I spent more on two HEMI heads and valve gear than I spent on whole 440 engines...


You know what 'Hemi' means translated from the original Latin? "God it's easy to dump money into this motor!"


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Gtxxjon] #2896607
03/06/21 09:35 PM
03/06/21 09:35 PM
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S.E. Michigan
ZIPPY Offline
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I have a good used pair of 110-M heads on the shelf if you want a matching pair.


Rich H.

Esse Quam Videri




Re: What set of 426 Hemi heads to buy for street & strip? [Re: ZIPPY] #2896712
03/07/21 11:11 AM
03/07/21 11:11 AM
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WoW thats well COOL Mr ZIPPY!

So after nearly 60 years of the 426 hemi, there still is no definitive answers to the 'hemi head' question.

When there was ONLY 'IRON' then life was SIMPLES and it was a level 'playing field'.

Now we have several 'street heads' that can easily do the job for most applications (I think)?

Like most things in life , you BUY what is available 'on the day' then you have to live with it!

Choice is a many 'toothed beast' and it can be hard to pick a winner.

I have a Moparmate who studies everything in minute detail, asks everyone's opinion and still BUYS the wrong thing...



Me I just 'go with my GUT' and hope that it will all be fine... panic

Good numbers on the INDY heads Dragula 452 in (60 over 440) 318 out (stock SB)... stirthepot

Last edited by Gtxxjon; 03/08/21 07:14 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: What set of 426 Hemi heads to buy for street & strip? [Re: Gtxxjon] #2896999
03/08/21 07:17 AM
03/08/21 07:17 AM
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So as per the INDY head numbers its...

1.5 times the flow in, than out, (460-320) will make in excess of 820 hp...

But I will will be using twin turbos, so I'm guessing that 300cfm, 'in and out' will be fine...? whistling shruggy catfight

Last edited by Gtxxjon; 03/08/21 07:19 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
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