Which 426 "Hemi" Head's.......?

[DrkHorse66]

    I'm looking to purchase aset of 426 head's in the next couple month's.I'm not looking for originality.I'm considering going with aluminum.What would be the advantage's of aluminum over stock beside's weight saving's?And most importantly.....What would be the "best" aluminum head (Performance,manufacturer,price,availability,etc.)? I've seen bare aluminum one's advertised for $999.00 each.I don't want or need anything exotic that cost's huge amount's to build.Just a good set that,with the internal's I got,can get me 650/750 HP.
                                                                                                                  Any suggestion's?

[daytonalo]

Just built and sold a 472 11-1 with mopar stage 5 alum heads , engine was 600 hp . Unless your stroking the motor or 14-1 comp , your not going to get anywhere near that # . I just started my 528 -11-1 alum head Hemi , my target is 700 hp !

[DrkHorse66]

   Thank's for the reply.I know 750HP. is some unrealistic but my actual target is at least 650 at a minimum without,hopefully,having to get into too much money.How much will a set of the Stage 5 head's,bare,run? Where can I get the best deal? Are these head's compataible with all external stock accessorie's,valve cover's? Who would you recommend for assembly that is really good with the Hemi engine's/head's?

[daytonalo]

I bought them from Mancini , 2 k for pair bare. I like alum heads for two reasons , weight loss , can run higher comp ratio without problem . Please inform me how you can get 650 hp from a 426 , 9.5 comp ?

[DrkHorse66]

  The engine won't/isn't running anywhere near stock compression or internal's.I've assembled most of the internal ingredient's up to this point with the exception being the head's.That's why I asked the question's about the advantage's of aluminum VS.stock.You gave me the answer I needed most in that the aluminum matche's better with higher compression and weight saving's.Do these head's respond well to port & polish? I assume they do.
                                                                                                                             

[daytonalo]

What comp  are you running ?

[firefighter3931]

If this motor is a stock stroke with 426 cubes you will see some power increases with a better flowing head...but i wouldn't be expecting a 426 running on pump gas to make that kind of power unless it had a very big cam and was spinning to 8k. 

Another member runs the aluminum heads on his 472 stroker hemi with a mild solid roller cam and it made in the 540-550hp range and runs on pump gas. 



Ron

[max]

from everything i have read there is only one good aluminum head for a Hemi and that's the stage v's. they flow alittle better out of the box then a set of MP aluminum ones.

the heads on my engine are indy irons and if i had to do it all over again i would have went with a set of stage v's but when i built my engine there wasn't much being said about aluminum heads except they leaked around the water passages. 

[keepat]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

[firefighter3931]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

Any flow sheets on those heads ? Any dyno sheets ?

Curious about the RPM it made that power at and what the curve looks like. Also interested to see how much CFM it pulled at WOT. 


Ron

[max]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

that's some serious hp on pump gas

[keepat]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

Any flow sheets on those heads ? Any dyno sheets ?

Curious about the RPM it made that power at and what the curve looks like. Also interested to see how much CFM it pulled at WOT. 

Ron

No copy of the flow sheet on the heads. But here's one of the dyno pulls.

[DrkHorse66]

  Thank you....."that's" the kind of information I was looking for when starting this discussion.Stage V head's-Check! 650-750 HP. possible without spending a million buck's-Yes/Check! That's what I was originally asking"Could I benefit from a set of really worked aluminum head's".Now I know that I can and I know the Stage V is a good one to go with.My comp. is 12.5:1.Thank you for the help.

[daytonalo]

Who makes that rocker gear

[keepat]

Who makes that rocker gear

It's all custom made for/by Ray Barton Racing, same set they use for up to 1500 hp Hemi's
Pat

[daytonalo]

How much for that set-up ?

[daytonalo]

Also , what kind of intake bolts are they ? Hex, stainless ??


Larry

[keepat]

Larry,

The complete rocker system, parts only cost $2,800 and the intake bolt are s/s by ARP
Pat

[daytonalo]

I'll stick with stock rocker gear !

[firefighter3931]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

Any flow sheets on those heads ? Any dyno sheets ?

Curious about the RPM it made that power at and what the curve looks like. Also interested to see how much CFM it pulled at WOT. 

Ron

No copy of the flow sheet on the heads. But here's one of the dyno pulls.

Nice power numbers Pat. The one thing that sticks out is the peak Torque numbers coming in so high...must be a very healthy cam. I'm assuming it's a roller with lots of duration ?

The Rocker gear look beautiful    Gawd...the top end hardware costs a fortune on those monsters. 



Ron

[keepat]

My 472 Hemi with aluminum mopar heads 10.25:1 comp make 711hp on pump gas! Stage V intake, cam and a ton of head work is where get the power!

Any flow sheets on those heads ? Any dyno sheets ?

Curious about the RPM it made that power at and what the curve looks like. Also interested to see how much CFM it pulled at WOT. 

Ron

No copy of the flow sheet on the heads. But here's one of the dyno pulls.

Nice power numbers Pat. The one thing that sticks out is the peak Torque numbers coming in so high...must be a very healthy cam. I'm assuming it's a roller with lots of duration ?

The Rocker gear look beautiful    Gawd...the top end hardware costs a fortune on those monsters. 



Ron

Big and bumpy but it's not a roller. It takes all day to adjust the valves.
Pat

[firefighter3931]

Big and bumpy but it's not a roller. It takes all day to adjust the valves.
Pat

That's really good power from a flat tappet stick ! 

Adjusting the valves is fun...especially on a beast like that. 



Ron

[daytonalo]

How many pistons  

[max]

Gawd...the top end hardware costs a fortune on those monsters. 


Ron

unfortunately the heads and rocker gear are the most expensive parts of a hemi.

Pat, that's a very sweet looking set up you have and excellent #'s to go along with it.

this is sorta off topic but since there's a few hemi owners here. did any of you catch the price on the new MP repo 1966-1971 inline 2x4 intake?

they have lowered the price for $1000.00 to $399.00. 

[keepat]

Gawd...the top end hardware costs a fortune on those monsters. 


Ron

unfortunately the heads and rocker gear are the most expensive parts of a hemi.

Pat, that's a very sweet looking set up you have and excellent #'s to go along with it.

this is sorta off topic but since there's a few hemi owners here. did any of you catch the price on the new MP repo 1966-1971 inline 2x4 intake?

they have lowered the price for $1000.00 to $399.00. 

I almost use that intake as it is lower then the stage V intake and would fit under the hood without modifying the aircleaning, but not sure you can get the same HP numbers with the MP intake?
Pat