440 source heads vs Edelbrook rpm heads

[hemiken]

Alright.  You should practise from not writting comments like Yea right for starters. and include people as a quote in the same post as your comment.

The 440 source head out of the box flowed incredible low lift numbers and had a very smooth and transitional flow curve.

Every Mopar Edelbrock i have seen out of the box has had issue with stumble and interuppted flow characteristics and very poor low lift figures.

These are all out of the box diagnoses remember,so this is one reason i would have 440 source over the Edelbrock.  And the fact that the 440source head looks stock on the ends like a standard casting head appeals to me aswell.

How is that

[Moparal]

You kids and yer desk top dyno talkin    But I LOVE INDY   And still have mine ported by my partner.

And the first person that calls me a *****, i', gonna smack em    

You two head strong guys are hilarious ,  Each one of you are assets, just like the heads you're talking about.   

If you both feel like hammer time, give me both barrells. I'm used to twin dominators...all 8 barrells, I can take it. Glad to see you guys are working it out. PM battles have more taste tho. since 2 good men are ram horn locking.....It is just winter time

[hemiken]

I am cool as can be Alan, and it is Summer here buddy

[nivvy]

You kids and yer desk top dyno talkin    But I LOVE INDY   And still have mine ported by my partner.

And the first person that calls me a *****, i', gonna smack em    

You two head strong guys are hilarious ,  Each one of you are assets, just like the heads you're talking about.   

If you both feel like hammer time, give me both barrells. I'm used to twin dominators...all 8 barrells, I can take it. Glad to see you guys are working it out. PM battles have more taste tho. since 2 good men are ram horn locking.....It is just winter time

I got tired of don picking on me now hemiken..... 

But again I did not mean it that way ken.... I guess my lingo typing sucks..... 

[Moparal]

If you 2 talked together in person on the phone, then you would be able to understand the voice behind the typing.  Although one of you 2 has an accent

[hemiken]

seems everyone i ring in America has an accent Alan..........................

[73EStroker]

My computer keeps crapping out so I will try and make this short.

73_rally - you have to remember that you can go cheaper now and pay later or you can buy a better product now for more $$. Heads are not cheap - look at Indy, Brodix, Stage V and Mopar. That has to be for a reason. A friend of CPs (and he is not poor) bought the Stealth heads, ended up machining them and adding parts to the tune of $400 more than my Indy EZs cost me. What does that tell you? If you want the aluminium look then just buy edelbrocks, at least they fit. Also the Bold Beeper project by Mopar Action dynoed the 440 with the Edelbrocks then replaced them with Indy EZs with no other changes, and got 50HP more. Case closed.

[Grancoupe]

My computer keeps crapping out so I will try and make this short.

73_rally - you have to remember that you can go cheaper now and pay later or you can buy a better product now for more $$. Heads are not cheap - look at Indy, Brodix, Stage V and Mopar. That has to be for a reason. A friend of CPs (and he is not poor) bought the Stealth heads, ended up machining them and adding parts to the tune of $400 more than my Indy EZs cost me. What does that tell you? If you want the aluminium look then just buy edelbrocks, at least they fit. Also the Bold Beeper project by Mopar Action dynoed the 440 with the Edelbrocks then replaced them with Indy EZs with no other changes, and got 50HP more. Case closed.

I read similar stats n those types of heads, but one thing that was also brought up was most of the heads you are pointing out make big HP with really high volume. That means either huge cams or high RPM's. Some of these heads might be too big for some of the milder street engines. You might give up a little HP on top end but get better all around numbers from bottom to top of your power band with a milder port sized head. these being the Edelbrock's or Stealth's. What do you think?

[nivvy]

regardless strealths are a crapshoot........... 

[71chally416]

I think Indy makes some great stuff and I know Ken Lazzeri from when he lived around here and used to run at Atco, but the question I have is why they always get beat in those enginemasters challenges by Jon Kasse and whomever else? They would seem to have the upper hand with all the resources they have. I think they did finally win one the Mopar magazine had, but it was a small block with iron heads that they didn't produce 

[moper]

There is little doubt in my mine that the intake port on the Stealth is the edelbrock design. Vitually identical. The exh is slightly different, because they are not raised, they are more of an Indy SREZ design. A cylinder head casting core contains several inner cores. The intake port, the exh port, and the cooling passages, plus the external shape. So you can copy each one, and then place them into your own external design. China and 440 source copy. Plain and simple. But they combine things in a nice way IMO. The execution is marginal, but so is everyone elses.

In terms of bring in Jeff at Modern (who i have talked to personally and used product from) as "just some guy" is really, really shortsighted. He is simply one of the best head guys in the US right now for domestic type V8s. The CNC program he has is not, as I understand it, the Edelbrock ones. BTW, there are a bunch of programs for each type of head. It's not one program for them all. RPMs alone have at least 4 as i know it. A cnc port design starts with hand porting and flow testing one port of each hand (there are rights and lefts) on the intake and exh, then digitizing the resulting design. You can't simply apply one program to a second manufacturer.

The heads flow similar after porting. IMO, the only thing I would use from 440Source would be the valves and castings. I won't trust the rest of the heardware, or the machining. However, most RPMs I use get the same treatment. I think the RPMs are a better product, but yes, I'm a walmart boycotting "made in USA" type shopper too. I cant eliminate all the exporting of wealth, but I can help lower it a little on identical product. Stealths are not identical to any single product.
Buy what will work for you, fits your budget, and fits your moral fiber. But understand there will be work required by all of them.

[bb71challenger]

So it is the opinion of most here that you cannot just buy a set of heads and install them? To tell the truth the Stealths intrigue me because of their low cost and factory outside appearance. I am planning a 470 or 500 stroker that I hope to get 550-600 hp from in non wild, pump premium flavor. Are you guys saying if i put 10.8:1 or 11:1 compression on a nice stroker and put a set of Stealth heads on it out of the box I cannot expect the heads to even fit much less deliver what I am looking for?

[71chally416]

If a bigger motor is in the plans get something that doesn't copy a stock head, like the Indy or B-1. Those stock clone heads don't have the port volume for a 500 cube motor. 

[Grancoupe]

If a bigger motor is in the plans get something that doesn't copy a stock head, like the Indy or B-1. Those stock clone heads don't have the port volume for a 500 cube motor. 

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My understanding is that the Indy and B1 motors need a special valley pan and intake. If this is the case then need to make room for the extra purchase. Correct?

[bb71challenger]

I actually like the stock outside resemblance but I am kind of confused. The combustion chamber doesnt look like a stock head to me, is it based off of the closed chamber heads like 915's or 516's.