How much power can a 426 Hemi make?

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815Hp, 640TQ, 438 ci, 1970 casting iron heads w stock valve sizes, 11.3 compression, 2-625 Carter carbs, good intake, aggressive roller cam, 2.25 headers, mid 1990's technology.

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Crazy stuff. So, despite all the recent developments in wedge head technology, the hemi is still a level above in potential? Even the older hemi heads? I'm no hemi expert, but the newer designs dont immediately look much different than the older ones. With the wedge heads, the difference is night and day. Sounds like a 700HP N/A street hemi wouldn't be too hard to build.

Also, i meant the old stock cars, not the drag cars. What were those 70's stock cars making right before they got banned?

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I couldn't give you a power figure....but it will be plenty.

I know absolutely nothing about Ron's toilets, and I have never used aluminum rods. I always found them a bit scary.

Everything I use is pre-historic, but I know it and it's reliable. Besides, I'm a dinosaur. Brother Bob told me so.

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Steve:
I have some of that old stuff in mine too. I run NASCAR rods and a 440 steel crank in my junk. But it runs great and has held together for quite some time now.

MB

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815Hp, 640TQ, 438 ci, 1970 casting iron heads w stock valve sizes, 11.3 compression, 2-625 Carter carbs, good intake, aggressive roller cam, 2.25 headers, mid 1990's technology.

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This motor is incredible considering those parts! I wish you were closer Mike, I'd offer you a couple of for . The curve is a lot steeper than people think.

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Just curious. It seems to be getting easier to squeeze a solid 600HP from a non-stroked 440 these days with all the aftermarket heads out there. What about a hemi? How hard is it to make say, 700HP naturally aspirated with a stock stroke 426? A few guys i know say its as simple as cleaning up the heads, blueprinting the valvetrain and using a serious solid/solid roller cam and a good intake/exhaust set-up?

How much power have hemi owners typically built for something driven on the street? What would a 700HP street 426 hemi be like? Technology has come a long way.

And i've also wondered how much power the old 426 hemi stock cars made?

We're always talking about this stuff here, the usual bench racin'... and no one has owned one, just figured i'd ask here and get some real input. I'm sure there are a few hemi owners/ex-owners here.

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Hey Rick, anymore info on your camshaft? I'm building a similar engine right now. Mike Roth

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MIke, I'll get the card on it, and post it...

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I think if you ran the numbers the stock Hemi MP pieces would still outflow the eddies by quite a bit. No disrespect for Edelbrock and their fine pieces meant. The wedge heads have come quite a distance from the old iron 906 heads that were commonplace in the old days.

What a lot of people miss is the fact that the Hemi is a no b/s design right from the get go. Nothing was compromised for street use, it is not a modified street engine. It was designed specifically for racing, and it was politics, NASCAR and NHRA alone that compromised it for steet use.

Years ago, around 83 or 84, when Warren Johnson was dominating in his Oldsmobiles, a close pal of mine was running Barnett's old PS Arrow with a 498 inch Hemi. WJ used to use Barnett's dyno, and one day we were in there with a Hemi motor, which had some ported 65 aluminum SS "K" head, doing dyno time and WJ was there with one of his PS DRCE Olds motors, which basically was a developed version of the bb Chevy. This was during a time when there was no factory involvement, or even encouragement, and we were racing any old stuff we could find around.

What we found was that Dom's Hemi actually made more hp and torque up until around 8000 rpm, and that is where the GM motors pulled away. We found that the Hemi valves opposing each other actually hurt the motor at big rpm, as the overlap cycle on the camshaft actually pushed the charge straight through the intake and out the exhaust. That is why the SS/AH guys now spend so much working with valve angle, and simplifying the cumbersome Hemi valve train.

The point I am trying to make is that in stock form the Hemi will still pretty much outperform everything. Using out of the box factory stuff, I think the Hemi is still the king of the hill.

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What we found was that Dom's Hemi actually made more hp and torque up until around 8000 rpm, and that is where the GM motors pulled away. We found that the Hemi valves opposing each other actually hurt the motor at big rpm, as the overlap cycle on the camshaft actually pushed the charge straight through the intake and out the exhaust. That is why the SS/AH guys now spend so much working with valve angle, and simplifying the cumbersome Hemi valve train.

The point I am trying to make is that in stock form the Hemi will still pretty much outperform everything. Using out of the box factory stuff, I think the Hemi is still the king of the hill.

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Didn't they used to slap blowers on the top of these things and make like 3 thousand horsepower back in the day?

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Interesting stuff. Now i wish i hadn't aborted my hemi plans a couple years ago. When i think about how much money that blower project would have (realistically) ended up costing, i probably could have scrounged up enough pieces to put a hemi together. Maybe i should think about this...

Far as i know, all i need for a low-budget 426 hemi is a used block, heads, valvetrain, covers and intake, yes? Anything else is just stuff i'd have to buy new for my lowdeck project anyways (pistons, rods, headers, cam, etc.)... Hell, even some old hemi parts and 440 parts thrown together making 500+ would be a cool starting point for my lil Challenger...

I'm sure some people here have put together relatively cheap hemis from time to time. Heh heh... and yes, i realize that "cheap hemi" is a fairly ridiculous term. Still, Hmmm...

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One thing to keep in mind when deciding what to build, anyone can make a wedge motor run good with the right parts( I do )Not everyone knows what good hemi parts(or what they look like ) are and what bad hemi parts are (including myself) Not all 426 Hemi, wedges or SB Mopars run the same Besides, it's a lot more fun whupping a Hemi car with a wedge motor(especially with a six pak) than it is whupping a wedge car with a Hemi motor Sorry, I couldn't resist

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Just because the SS/AH guys do it doesn't mean it's right for everyone.

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It would have been right for Dominic, is my point! His car seemed like it was set up adhering to pro stock rules. So cubic inch was limited. But to make hp, running up the RPM’s is the answer. The problem is with mostly stock valve train geometry, running above 8000 I bet he had all sorts of deflection he didn’t know about… pushrods, rocker arms, cam, etc. He could have had a huge roller in it (and I’m sure he did) but with the pushrods bending all over the place at that RPM he isn’t going to get advertised lift. I doubt excess overlap was why he wasn’t getting numbers past 8000.

SS/AH cars have addressed deflection issues and that’s why they run above 9000 RPM making 1000 hp. If Dominic did what SS/AH guys do today back then, I bet he would have given WJ a run for his money on the dyno! And it would have been neat, too! Although I agree doing that for just a bracket car makes no sense!

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Didn't they used to slap blowers on the top of these things and make like 3 thousand horsepower back in the day?

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Still using the basic 426 blueprints in Top fuel motors

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You can't say that here. Lots of people get bunched panties, and don't want to hear that they are related in any shape/form.