Posted By: jjdirt
440 heads - 05/04/13 07:18 PM
how good are mopar stage 6 heads and how do they stack up compared to edelbrock and 440 source---for a 500 stroker thanks
Quote:been in the high tens on a 440 and 470 in my 3300 belvedere.just minor blending and good valve job.been beat on for 10 years,these were 10.5 compression engines.
how good are mopar stage 6 heads and how do they stack up compared to edelbrock and 440 source---for a 500 stroker thanks
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Well, lessee. Here are OOTB flow figures for the heads you are asking about, all from the same flowbench, using 2.14 intake valve.
Lift......STG VI....STG VI MW...Stealth....RPM
.100........66...........61...........66..........73
.200......144..........144.........142.........148
.300......175..........188.........205.........209
.400......206..........232.........240.........254
.500......226..........256.........255.........276
.600......236..........257.........267.........287
.700......240..........261.........268.........291
The Stage VI & VI MW are most work to set up. Properly prepared the STG VI Max Wedge has the most potential for 500 ci. None of them should be bolted on right out of the box.
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The factory cast iron Max Wedgies used the same standard length valves and they run a pretty good number w/o a raised port. Yeah, they had a bigger intake port window but a Stage VI can be opened up to that size too. They were offered that way too.
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The factory cast iron Max Wedgies used the same standard length valves and they run a pretty good number w/o a raised port. Yeah, they had a bigger intake port window but a Stage VI can be opened up to that size too. They were offered that way too.
Dean the factory max wedge and the stage 6 are 2 different animals. The factory max wedge head has a standard port location, the stage has a raised port so when you put it on a low deck you have to use a 440 intake, on an RB the 440 intake requires spacers or the special mopar made only single plane. There is a huge hump in the roof of the stage 6 intake port because of how deep the spring pocket has to be to use a stock length valve. Put a longer valve, we used one for a BBC application and that hump pretty much disappears, that is what Chapman racing did when they did the stage 6's.
Mopar really dropped the ball on the stage 6 design ...
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Yes, the Stealth and RPM use a standard length valve. But as you probably already know, the valve stem diameters are different. The Stealth and RPM are 11/32 and the Stage VI is 3/8.
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The factory cast iron Max Wedgies used the same standard length valves and they run a pretty good number w/o a raised port. Yeah, they had a bigger intake port window but a Stage VI can be opened up to that size too. They were offered that way too.
Dean the factory max wedge and the stage 6 are 2 different animals. The factory max wedge head has a standard port location, the stage has a raised port so when you put it on a low deck you have to use a 440 intake, on an RB the 440 intake requires spacers or the special mopar made only single plane. There is a huge hump in the roof of the stage 6 intake port because of how deep the spring pocket has to be to use a stock length valve. Put a longer valve, we used one for a BBC application and that hump pretty much disappears, that is what Chapman racing did when they did the stage 6's.
Mopar really dropped the ball on the stage 6 design ...
OK John, I'm aware of all that. I was just sayin that despite the factory valve length they can run well. NOT the best but well. I've read up on the Chapman's (pricey = $$) and Mopar even cast some extra wide intakes to fit the Stage VI'ers on an RB block w/o spacers. Workin' a deal on one right now.
Does the Stealth's and Eddy RPM's run a standard length valve? I don't care to check at this point since I've got a set of Indy EZ's and now some Stage VI's too. They'll be fine for what I do. Some of us don't have to go with what is the latest hot ticket. We work with what comes our way at a good price.
It's all good!
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AND TO MUDDY THE WATERS FURTHER.....
Isn't it true that in later years MP also made Stage VI heads that could run on a 440 without using the spacers?
R.