Moparts

572 hemi in a street car

Posted By: 73cuda340

572 hemi in a street car - 11/17/10 12:48 AM

I have been looking at getting a 572 hemi for my 73 cuda that is going to be a street car with a trip to the track every now and then. Any thoughts on if this will be too much motor for a street car? Gas milage obviously isnt a concern, I just dont know if this will be something that will do nothing but sit there and spin whenever i want to get on it and be useless without a pair of slicks. Was considering maybe a 528 hemi too. Car currently has a 340 that i built for it. Any thoughts?
Posted By: kielbasa

Re: 572 hemi in a street car - 11/17/10 01:00 AM

it'll have a little more than the 340, maybe not night and day, but noticeable.
if it's gonna be a street car, forget the slicks. whole lot more fun sliding around corners, etc.
half the fun driving these old mopars is fighting with the steering trying to keep the thing in a straight line while showing off.....
Posted By: AndyF

Re: 572 hemi in a street car - 11/17/10 01:29 AM

The 528 with a single carb on a dual plane intake should be very street friendly.
Posted By: Mr T2U

Re: 572 hemi in a street car - 11/17/10 01:55 AM

it depends how it's built, what gears are in the rear, and how hard you drive.
i have a daily driver 572 hemi in my 72 road runner. low compression, single plane indy intake and still makes 500 lbs torque at 1500 rpm. if you drive it reasonably it gets around 14mpg on the highway.
you have to ask yourself what exactly you want and build accordingly.
Posted By: DaveRS23

Re: 572 hemi in a street car - 11/17/10 03:29 AM

From a 340 to a 528/572 Hemi is quite a step. Have you had cars with that kind of power before? Do you have the suspension and drive train that will handle that kind of power? If not set up right, then the car could be a real handful. Or even dangerous.

I personally have had big blocks all my life. Driven and raced them for 30 years. A few years ago I built an Eddie headed 500" stroker. It is a different animal altogether. Even now, with a good suspension set-up, it can break the tires loose at 45 mph if I am not careful. Things happen very fast with this level of power. And you will probably have even more horsepower given the additional inches and the fact that it's a Hemi.

If possible, you may work your way up to that kind of power a little at a time. That way, you your drive train and your suspension can get up to speed.
Posted By: cudaboone

Re: 572 hemi in a street car - 11/17/10 04:41 PM

Go for it. I put a 528 maxx aluminum hemi, 1050 dominator with 5 speed overdrive and 430 rear in my 72 cuda. What a rush. Can easily get away from you. Problem is you can't get enough tire under it. Have put sub frame connectors on it. This is a street only car.

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Posted By: imfixinmopars426

Re: 572 hemi in a street car - 11/17/10 06:14 PM

Quote:

it'll have a little more than the 340, maybe not night and day, but noticeable.



a little more? i be afraid if it hooks hard the windshield would pop out,and break the seat back...lol..
Posted By: quickd100

Re: 572 hemi in a street car - 11/17/10 07:35 PM

Either motor will do the trick. For the last couple years I've been finding and upgrading the 'weak links'. I plan on putting some bigger street rubber under the truck in the coming year. It will smoke the tires at any speed up to 70 right now. I opened up the wheelwells to fit a pair of 32.5x14 radial drag slicks.
In any case either motor will at one point scare you into wishing you had a pair of depends on.Dave
Posted By: jbc426

Re: 572 hemi in a street car - 11/17/10 07:52 PM

Broken windshields and wrinkled quarter-panels....ahhh, the price we pay for performance. There's an old saying, "Speed costs money, son. How fast do you want to go?"

Is bigger always better?

I was going to build a big old 550+ cubic inch sixpack motor, but decided to just build a little 493 inch motor because of the above mentioned items. As it is, it puts out close to 700 horsepower at 5500 rpm, and I'm still worried about those things.

I had to spend a lot of money upgrading all the links in the chain to handle that horsepower level, fuel system, ignition system, exhaust, driveshaft, subframe connectors, and Cal-tracs. With todays DOT legal drag-radial tire technology, hooking up is going to be possible, but tire life short.

Something to think about when deciding....One time I had a 500 horsepower 440" 'Cuda do an nearly instantanious 180 degree rotation at 45 mph when I popped the clutch it in 2nd while punching it. My buddy still talks about that to this day. We spun out onto the freeway backwards in a cloud of smoke. Got lucky that day. I never had that car do anything like that in the hundreds of times I'd done that before. Note to self, be f'ing careful with big horsepower.




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Posted By: Paul_B

Re: 572 hemi in a street car - 11/17/10 08:31 PM

I'm running a 528 Hemi on the street that has a mild cam and 850 carb. It's pretty much like driving a big block except it makes you wish you had a spare set of shorts when you nail it. :biggrin
Posted By: Mr.Yuck

Re: 572 hemi in a street car - 11/17/10 08:58 PM

Quote:

I have been looking at getting a 572 hemi for my 73 cuda that is going to be a street car with a trip to the track every now and then. Any thoughts on if this will be too much motor for a street car? Gas milage obviously isnt a concern, I just dont know if this will be something that will do nothing but sit there and spin whenever i want to get on it and be useless without a pair of slicks. Was considering maybe a 528 hemi too. Car currently has a 340 that i built for it. Any thoughts?



I guess I don't see the need for all of that. If you just want a cool street car why not a 426 or 472? As mentioned all that motor is going to require some serious mods to get it to stick. Why not do a blown hemi for that matter?
Posted By: RapidRobert

Re: 572 hemi in a street car - 11/17/10 10:18 PM

Quote:

I have been looking at getting a 572 hemi that is going to be a street car Any thoughts on if this will be too much motor for a street car? Gas milage obviously isnt a concern, I just dont know if this will be something that will do nothing but sit there and spin whenever i want to get on it and be useless without a pair of slicks. Any thoughts?

Do it. You'll be able to use as much or as little of the power that will be available to you with it and as said w the tire tech avail nowadays you can get it to hook. I haven't met anybody yet who after the fact wishes that they didn't have that much power at their disposal in fact just the opposite they wished they'd have built a killer right from the getgo.
Posted By: CRE2004

Re: 572 hemi in a street car - 11/17/10 11:43 PM

You're welcome to come drive mine
Posted By: quickd100

Re: 572 hemi in a street car - 11/18/10 12:58 AM

As we've stated above, big horsepower can get you in trouble real quick, you really have to be aware of the conditions and surroundings.
The very first time I drove my truck with the 528 under the hood I darn near killed myself. -25F., I decided it would be safer to run it up to 70 before nailing it. It instantly started spinning the tires, I used up both lanes and shoulders before I could get it straightened out enough to get off the throttle.
The biggest problen as I see it though is...you get used to the power pretty quick and then want more. That's the main reason I bought a Dyno, the need to find more hp. Horsepower....more addictive than Heroin. Dave
Posted By: 73cuda340

Re: 572 hemi in a street car - 11/18/10 03:58 AM

How is everybody else hooking up with their cars and the hemi's?
Posted By: RUNCHARGER

Re: 572 hemi in a street car - 11/18/10 04:26 AM

I've got a 472 Stage V in my car. I run a stock convertor and 3.23 rear gears along with a stock exhaust system. That tames it alot but it's still easy to spin the tires from here to Mexico. I like the bigger cubes in a street car because you can get very good performance from it but with lots of tractability and lower revs. I've had at least 1 at a time Hemi since 1980 and the stroker crank is the way to go with a Hemi on the street.

Sheldon
Posted By: Keith Black®

Re: 572 hemi in a street car - 11/18/10 05:48 AM

Quote:

How is everybody else hooking up with their cars and the hemi's?


Posted By: 73cuda340

Re: 572 hemi in a street car - 11/24/10 03:19 AM

Anyone else?
Posted By: topside

Re: 572 hemi in a street car - 11/24/10 04:30 AM

'68 Hemi RR, 4-speed, 4.10, 438", 540HP & a bit over 500ft/lbs before the carbs were straightened out. Not a prayer of hooking up on the street until 3rd gear if the 295/50R15s T/As are mounted. With M&H DOTs on it it's a lot better, but you can still break 'em loose bigtime clutching it in 1st gear. Before the car was restored, it had cracks at the cowl from street racing it; you could see the car twist when powershifting. There's more rear weight bias on my car than an E-body.
The other thing to keep in mind is slowing it down; My 11" drums are fine until 3rd gear wide-open, so ya gotta pick empty places to let it out.
Posted By: Dragula

Re: 572 hemi in a street car - 11/24/10 04:44 AM

Quote:

Quote:

How is everybody else hooking up with their cars and the hemi's?






We run a couple of Hemis on pump gas, and getting the rest of the car to survive them is usually the biggest issue. The little 477 pump gas street Hemi in the Charger has killed 4 rear ends, 1 drive shaft, a set of brakes, 10 wheel studs, and a set of leaf springs, and a set of seat brackets....That little engine has pushed the 4010lb Charger to 11.1 at 122mph and a 1.58 60ft...

My 484 Hemi in my Cuda has killed just about everything from kinked quarter panels to inner fenders torn off the frame rail, to crushed oil pans, crushed headers, cracked window glass, de-arched leaf springs, broken pinion snubbers, and a gawd aweful amount of rear tires....Should go 9's, but I always break somthing.

A 572 will do all that and more I am sure...
Posted By: Zapp

Re: 572 hemi in a street car - 11/24/10 02:00 PM

Looks like im in for some fun then, 604" FHO Aluminum Hemi, full manual 727, Carbon fiber tailshaft and Strange Dana with Detroit locker and 3.54 gear. Just need to paint the Challenger and install it all, Ive gone Chassis connectors, Torque boxes and a Moly Cage is coming soon. BTW Hemi is 11:1 with Cross ram 890HP 837ft/lbs
Posted By: Keith Black®

Re: 572 hemi in a street car - 11/24/10 09:01 PM

Awesome! Good luck
Posted By: 73cuda340

Re: 572 hemi in a street car - 11/25/10 03:34 AM

What times are you guys running?
Posted By: 1962Savoy

Re: 572 hemi in a street car - 11/25/10 04:10 AM

Hey Zapp I just had Tim @ FHO build me a 572 wedge that puts out 750 hp for the street!!!!
OH YA I'm STOKED!!!!!!
Posted By: Keith Black®

Re: 572 hemi in a street car - 11/25/10 05:17 AM

Quote:

How is everybody else hooking up with their cars and the hemi's?



This is my street car build. I'm expecting around 1100 ft/lbs, 1,500hp.... this is the rear setup.
I have zero expectations of hook up.

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Posted By: Zapp

Re: 572 hemi in a street car - 11/25/10 12:06 PM

Quote:

Hey Zapp I just had Tim @ FHO build me a 572 wedge that puts out 750 hp for the street!!!!
OH YA I'm STOKED!!!!!!



In the Savoy that will be cool, Tim was awesome wish I had more money to spend with him and Id have thought about a blower and injection, maybe next time(dont tell my wife)

DarrenB that thing looks cool.
Ill be at MoparRumble hope to see some cool Hemi cars to give me a kick in the pants on mine...
Posted By: 1962Savoy

Re: 572 hemi in a street car - 11/25/10 03:15 PM

Quote:

Quote:

Hey Zapp I just had Tim @ FHO build me a 572 wedge that puts out 750 hp for the street!!!!
OH YA I'm STOKED!!!!!!



In the Savoy that will be cool, Tim was awesome wish I had more money to spend with him and Id have thought about a blower and injection, maybe next time(dont tell my wife)

DarrenB that thing looks cool.
Ill be at MoparRumble hope to see some cool Hemi cars to give me a kick in the pants on mine...



Ya Tim knows his stuff thats for sure! I wont tell your wife but if you need me to hide you a blower give Tim a call and I.ll pick it up for ya and hold on to it!
Posted By: 1962Savoy

Re: 572 hemi in a street car - 11/25/10 03:18 PM

Quote:

Quote:

How is everybody else hooking up with their cars and the hemi's?



This is my street car build. I'm expecting around 1100 ft/lbs, 1,500hp.... this is the rear setup.
I have zero expectations of hook up.



WOW!!!!! If it wont hook up how you goin to get to the gas station??? silly boy!
I always say go big or go home but my wallet wont allow 1,500 HP
Posted By: hemi-itis

Re: 572 hemi in a street car - 11/25/10 06:05 PM

The only hope of hookin' on the street is with a bigger tire of the very soft compound.Do JOHN FORCE burnout and back into your own "stripes".Now you have a slight chance.I just finished off a set of 16.5X31 m/t pros.At 60 mph if I downshift and whack it,it just blows the tires off.

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Posted By: DPelletier

Re: 572 hemi in a street car - 11/25/10 06:47 PM

Quote:

it'll have a little more than the 340, maybe not night and day, but noticeable.




Funniest thing I've read all day!

Dave
Posted By: Darter6

Re: 572 hemi in a street car - 11/25/10 07:13 PM

I run the Hemi 472 single carb in a 64 Savoy. Very Streetable. Full TTI exhaust has a nice sound to it. Started with 3.91's and ended up with 2.94's to make it cruise better. Can drive it anywhere.As mild as my Slant Six car till you mash the pedal.Yes you will never get it to hook on street tires but who cares??? AND top end?? you will run out of road way before the engine runs out.........
Posted By: HotRodDave

Re: 572 hemi in a street car - 11/25/10 08:03 PM

I don't have a hemi but I run 2.76 gears and tight converter it helps my 360 hook up even with just a 225-55-17 tire. I have to put some effort into a smoke show but it will do it. Top end is incredible to say the least, hitting 3rd gear near 100 mph is quite a rush
Posted By: Keith Black®

Re: 572 hemi in a street car - 11/25/10 09:37 PM

Quote:

...DarrenB that thing looks cool.
Ill be at MoparRumble hope to see some cool Hemi cars to give me a kick in the pants on mine...



cool. I thought it had been and that i had missed it... turns out Mopar Rumble is on this weekend!!
Posted By: Keith Black®

Re: 572 hemi in a street car - 11/25/10 09:41 PM

Quote:



WOW!!!!! If it wont hook up how you goin to get to the gas station??? silly boy!
I always say go big or go home but my wallet wont allow 1,500 HP



... Hahaha ..check out my thread on the fuel system (detailed specs and photo's) in Unlawfuls.. Fuel pumps could empty a tank in < 3 mins.. anyway, it's just my idea of a street car
Posted By: CRE2004

Re: 572 hemi in a street car - 11/26/10 12:04 AM

Quote:

What times are you guys running?


10.63 on motor
10.10 on a 175 shot
4000# 3.73 gear foot braking
Posted By: PlumCrazy73Dodge

Re: 572 hemi in a street car - 11/26/10 01:49 AM

I also believe you can make it streetable...as stated earlier you will need the other components....diff....supports throught the car..sounds like a cage car if its going to the track...its going to be a 10 sec or 11 sec car at least.....I dont think you will break a million things just taking it down the road.....that will result from hard launches and fast breaking from 100 plus MPH.....just driving and getting on it in a fluid motion is different then hammering the pedal looking to hook up
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