528 hemi dynoed 620HP looking for 750HP - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-28-2008, 07:30 PM
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528 hemi dynoed 620HP looking for 750HP

Hi,

I have a 1966 Dodge Charger ( 4,000 pounds ) with a 426 hemi bored and stroked to 528CI. The heads are stock 66 559 casting iron with slight polish. I am running the stock dual plane 2x4 intake with a pair of new style carter 625cfm carbs. The Cam is 267@50 duration and 617/587 lift. solid lifters flat tappet. 10.5 to 1 compression on 93 octane no issues
3000 stall converter and cheetah manual valve body 373 rear. TTI 3 inch exhaust and TTi headers.

The motor dynoed at 620Hpat 6,000 rpm 630 lbs torque at 4100rpm and fell off from there. Over 600 lb toque from 3000 to 5200rpm and 542lb torque at 6,000rpms

90 percent street driven.


My question is do I need to go to a single plane intake? Change my heads or port them? I would like to try to get 750HP and still keep the torque.
I am thinking that all the low end torque is wasted as I am over 3000 with the converter anyhow? Am i missing something?

Thanks for the help

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Old 10-29-2008, 12:24 AM
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Do you have a stock(66 model)block, i've seen the main webbing come out of them at 600 HP on many of them! I think you should look at your combo as being basically a 426 Street Hemi(version) with a bigger cam, and it just also happens to be "stroked" a little.I think the HP #'s you have gotten are to be expected for what little is really done to the engine, as far as boosting power over a stock Hemi. To obtain that kind of power, even with big cubes on your side, I think you are going to have to get more radical with the cam, compression, and definately change to a better intake/carb combo. Your torque #'s are awesome, which is also expected with the stroke you have. Most Hemi heads are large enough in the runners the way they are already. But you still might find yourself having to explore that if you still can't get there(750 HP) with the other changes you make.
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Old 10-29-2008, 11:09 AM
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528Hemi... can you give us a little more to go on? I'm having a little trouble. Its always possible that you are perfectly on the level, but building a 528 with a 1966 casting is nearly impossible, and getting 620 hp from stock 559 heads is a bit of a stretch. Claiming that its a stock intake making 620hp is pretty ridiculous.

But, if you had the $30,000 to build a 528 Hemi, you can afford a $300 nitrous kit to get 750hp.
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Old 10-29-2008, 12:36 PM
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A stock Hemi head flows about 315 cfm at .600 lift which equates to around 640hp for the cubes you have so you're not too far off. My guess would be you need a bit more head work as well as a different intake to get to where you want to be.
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Old 10-29-2008, 05:41 PM
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CNC-dude: It is not the stock block. It is a MP Simese block not a 66 block.
The rods are new RBRE on-trac 4340 sportsman H-beam. New MP rockers OEM style. The motor is pretty fresh with maybe 3,000 miles.

Curtis: see above. I can assure you of the HP/torque. It was built by Ray barton some years back and I have the dyno sheet. It is the stock intake with 2 new carter 625CFM carbs. Yes, Nitous would do it but I want to try to make it NA

Enginecar: Thanks..I think that is what I am going to do. I was thinking of stage V fully ported heads and going with the stage V single plane intake. I want everything to fit under the hood.
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Old 10-29-2008, 05:47 PM
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Ok... I stand corrected.

... Back to my GM products
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Old 10-29-2008, 06:52 PM
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add stage v ported heads or new casting ported alum heads 400-440 CFM range
add Cometec head gaskets
add head studs
add RB single 4 bbl manifold, port match and flow match
add single dominator 1250 range
add roller rockers roller lifters roller cam lift 650 660 range + tapered pushrods
add gear or belt drive
add new springs retainers keepers to get 2.00 installed height
add new Manley valves I & E 2.20-2.25 1.90 TO 1.94
add great headders 2.25 X 3.5 4.0 port match and tune
Change rod bolts to min 200,000 preferably 240,000 strength
made sure pins are either 180 wall or tapered not tool steel
stud main caps
UPGRADE OILING SYSTEM TO EXTERNAL FEED & PRO PUMP
Pray MP crank and H beam rods hold up
rev to 7000-7500 expect about 1.6 to 1.8 hp per ci
simple....
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Old 10-29-2008, 07:22 PM
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OHD

Thanks for the information...Geez I did not think I needed to change so much
to get the extra 130HP. I know you are listing all the best stuff.

I was hoping to spend about 7k on this project

The motor has:

Arp Hemi main Stud/Nut set
Childs and Albert B/RB/Hemi Cam bearing set/standard
Fel Pro RB, Hemi head gasket 4.500" bore .051" thick
Sealed power R/RB Hemi oil pump high volume
7 quart oil pan
RBRE on-trac B/RB Hemi double roller chain & billet gear set 3 bolt
RBRE ON-Trac hemi 1.94" super flow exhaust valves 5/16" stem
RERE On-Trac hemi 2.250" Super Flow Intake valves 5/16 stem
Manley spring cups 1.550" spring
Manley Double springs w Damper 1.550" DIA 170@1.900/500@1,200" Bind 1.100"
RBRE OnTrac severe duty 3/8x083 Moly push rods
a bunch of other new harware

I will have to re-think this project. Maybe I am asking for to much for a street car.

Also I was hoping to try and limit the RPMS to around 6,800. I still want it to be streetable. Maybe it is not possible to have both.
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Old 10-30-2008, 12:05 AM
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I think engineczar has you on the right track..... Good choice on the block, I've done several wedge head combos with just 500 cubes that cranked out 1150 HP with nitrous, they can take it. Belt drives for sure are the "cats meow", but totally uneccessary for your street engine or application. I would however consider stepping up to a roller set-up, only if your head work and intake/carb swap leaves you shy of your goal....but I think you will be pretty close with those changes!
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Old 10-30-2008, 06:27 AM
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The heads alone
Cores 2200
Porting 1500-2500
Valves springs retainers keepers etc 12-2000

STD refresh no changes 25-4500

Horsepower gets very expensive when looking to get more than the stock type components produce. It gets REALY EXPENSIVE when you use lower quality components and they cause a failure.

The good thing about quality HEMI parts is they also sell for premium prices used, sell your parts and buy the new ones and the net cost can greatly reduced.
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