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I have a a Hemi block but is it the right one for me? #2593002
12/17/18 12:03 AM
12/17/18 12:03 AM
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Troy Offline OP
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Im trying to figure out what to do so I figured I would start here.

I have a new, never built, pre World 4.500 Hemi block. I don’t know if I should build a street friendly 528ci or try and find a 4.250 water block and build a 472ci. It’s going into a 1968 Super Stock Barracuda clone that will be street driven. I’m looking to make 550hp so do I build a siamese bore engine and hope I can keep it cool or trade it to somebody with a new water block and not worrie about over heating it?


....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593052
12/17/18 05:12 AM
12/17/18 05:12 AM
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astjp2 Offline
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Its the same price to build a 426 as a 572, so go with the 4.5 stroke crank and have more than enough power to do anything you want. I did...and cooling is not a problem with a big enough radiator.

Last edited by astjp2; 12/17/18 05:13 AM.

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593070
12/17/18 09:52 AM
12/17/18 09:52 AM
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Abilene, Texas
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I’ve got a bud who bought a 528 Arruza hemi. It was a pre world block. I’m not sure I remember the specs but I pretty sure it was a 4.25 bore originally. I think he went with a .100 over bore and a 4.25 crank. I’m too lazy to dig up a website and do the math but I think that was it. You can still use the internal oil pickup with a 4.25 stroke. He has no trouble with heat problems even in Texas. He has a roller cam that is way too big or he would drive it more often.

Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593101
12/17/18 12:17 PM
12/17/18 12:17 PM
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Troy, I've built a few siamese Hemis, no cooling issues at all. Used a new 3 core rad, original shroud, old mopar clutch fan and correct pulleys on all. Building another right now for my Hemi Dart, will be the next power tour cruiser.

Re: I have a a Hemi block but is it the right one for me? [Re: Hemidavey] #2593144
12/17/18 02:19 PM
12/17/18 02:19 PM
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Some good info here. Part of me says just build a 528 and be done with it. Another part of me says if someone is looking to trade a 4.500 siamese block for a water block then I can make two people happy. I can’t go with a big radiator because I need a Stock looking rad.


....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593152
12/17/18 02:36 PM
12/17/18 02:36 PM
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So Near, Yet So Far
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550HP is pretty easy even at around 426CI; my 438" Street Hemi made 540 with old cam technology.
More cubes means of course that it can be tamer at that power level. At 528" I'd think it'd be hard to NOT make well over 600HP.

Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593200
12/17/18 03:42 PM
12/17/18 03:42 PM
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Originally Posted By Troy
Some good info here. Part of me says just build a 528 and be done with it. Another part of me says if someone is looking to trade a 4.500 siamese block for a water block then I can make two people happy. I can’t go with a big radiator because I need a Stock looking rad.

US radiators 3 or 4 row optima copper brass, tripple pass looks factory, just get it in 26"


1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593295
12/17/18 06:58 PM
12/17/18 06:58 PM
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I can't think of a reason not to build the siamese block. Use a 7.1 rod with GM ends (2.2/.990). On the street...it will live forever if it's done right. GM ends let you buy a more common rod/bearing, plus it takes a little weight out of the already heavy Hemi rotating assembly. Go bigger if you can, usually very little cost difference between a 528-540-572" combo.

Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593458
12/17/18 11:25 PM
12/17/18 11:25 PM
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Thanks for all the feedback.

These Hemi Darts and Barracudas left the factory with 22” radiators so a 26” is not the look I’m going for.

The 472 in my Dart is making 530hp and that is just fine for what I’m doing. My cars still have the factory 6” wide wheels so it’s not like I can even use the HP that I’m making.


In a nutshell I’m looking to trade a new 4.500 Hemi block for a new 4.250 water block. I know somebody out there could benefit from this.

498E291F-DADF-45D8-87AB-43B39CC72063.jpeg
Last edited by Troy; 12/18/18 12:04 AM.

....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593549
12/18/18 01:27 AM
12/18/18 01:27 AM
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Not sure if you'll be able to find a trade or not but you shouldn't have any problem selling that block and then using the cash to buy what you want. You might want to call around and see what you can find. Mazzolini, FHO, Barton, etc. Someone might have what you want sitting in the back corner.

Re: I have a a Hemi block but is it the right one for me? [Re: AndyF] #2593582
12/18/18 03:25 AM
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Originally Posted By AndyF
Not sure if you'll be able to find a trade or not but you shouldn't have any problem selling that block and then using the cash to buy what you want. You might want to call around and see what you can find. Mazzolini, FHO, Barton, etc. Someone might have what you want sitting in the back corner.


Hi Andy, good idea. I will start that soon. Thanks


....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2593755
12/18/18 02:29 PM
12/18/18 02:29 PM
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Originally Posted By Troy

In a nutshell I’m looking to trade a new 4.500 Hemi block for a new 4.250 water block. I know somebody out there could benefit from this.


Troy, I think I might have the block you want. Pre-World, new 4.250 water block. Never assembled. Unfortunately, we are on opposite sides of the country but I am very open to figuring sonething out. Let me know if you are interested.

Stan

Re: I have a a Hemi block but is it the right one for me? [Re: HemiStan] #2593857
12/18/18 04:52 PM
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I would go with the 528" option. My 528 Hemi is a 10.5 pump gas street engine & knocking on the door of four digit horsepower numbers on motor only. I still have two additional NOS foggers plumbed on it also just in case I am late for work....


1963 Belvedere 440 Max Wedge Tribute
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1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
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Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2594324
12/19/18 05:13 PM
12/19/18 05:13 PM
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I have still not heard why you wont do a 572...go big or go home. ITs the same money and less stress on the motor for the same power.


1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2594415
12/19/18 08:16 PM
12/19/18 08:16 PM
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get a quote from Fastenal for shipping if you strike a deal!


HEMI,S ARE FOREVER!!!
Re: I have a a Hemi block but is it the right one for me? [Re: astjp2] #2594566
12/20/18 03:21 AM
12/20/18 03:21 AM
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Originally Posted By astjp2
I have still not heard why you wont do a 572...go big or go home. ITs the same money and less stress on the motor for the same power.


Good question. There are several reasons why I don’t want a 572. My 472 already has more HP than the tires can handle. I’m building the same package but now in a Barracuda. I don’t want or need 650hp out of a 572. A 472ci would work better for me. Bigger is not always better. These are the tires that will be the car. Would you want to put 650hp to these tires??LOL!! I don’t think so. 😋

Thanks for the reply, Troy

97E515BF-506B-4673-920B-CC0C438DD180.jpeg
Last edited by Troy; 12/20/18 03:24 AM.

....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: I have a a Hemi block but is it the right one for me? [Re: Troy] #2594662
12/20/18 01:20 PM
12/20/18 01:20 PM
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I built a 472, a 528 and installed a 572 in my Buddys Cuda. I really liked the 472 combo. It made all the power a street tire car could handle and the fuel mileage was better too. I find the 472 to really be a good combo and the block is lighter as well. Another benefit is that I ran unported Stage V heads on the 472 and it seems to be a balanced combination, so you can save money on porting. Although I guess if building a bigger cube engine you could run the Edelbrocks unported as well.
I think the big cube thing is more an ego thing. I see lots of big cube engines idling into the cars and coffee deals, these cars never run slicks.

Last edited by RUNCHARGER; 12/20/18 01:24 PM.

Sheldon






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