DartGT66 - What do you think??

[Marc]

I'm building a 1940 Plymouth Coupe for a STREET car. It already has a 2"X3" Morrison frame, 10 point cage, 4 link with Koni coil overs, etc.. etc...
I'm using an 8 3/4" rear with a back brace and load bolts for the pinion caps.It has 4.10 gears and a 32.2" tall tire, 19" tread.(Pro Trac S 515)
The engine is set back a fair bit. The front of the block is in line with the center of the front wheels. It uses a 727 Auto.
I am figuring the car should weigh between 2750 and 2900 pounds.
I'm thinking of running a Hemi, as you know. I just contacted Indy and have preliminarily decided on a 528 ci Street Hemi, with their EFI system, Indy Maxx aluminum block, Indy Legend heads, 650+ Horsepower and 650 foot pounds of torque. It lists the cam as a .495 lift HYDRAULIC!?!
I'm not looking for a KOS car. I street drive the thing AND pull a Boler trailer with it.
Do you think this conbo is reasonable? Am I overlooking anything you can see? What about a first stab at recommending a converter? I would think with such a puny cam I could get away with a 2500-2800 stall. Is this crazy or.... I'm not a rich bugger, so it's going to be a one time try. Any help you can shoot me would be appreciated. Thanks Marc.

[ChristianCuda]

Marc
I realize you asked DartGT66 But figured I would give you a hand and you can do with it however you want.

Just running some initial test figures 2800 3000 RPM stall looks right. Also looks like a little too much gear. But without all of the cam specs I couldnt be sure

Christian

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68 'Cuda 383 Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360

[Marc]

ChristianCuda - 4.10 gears too much? Don't forget the tires are 32.2" tall.It's really a street car with the more than occasional trip to the track.My Demon has 32" tall tires with 4.56 gears, I replaced the 5.13 gears as I drove on the highway quite a bit. The 4.56 gears I find acceptable, but just barely.I thought the 4.10 gears were a bit conservative!!
I don't have cam specs yet as I'm still trying to decide which route to go. The only spec I got from Indy was that the HYDRAULIC cam was .495" lift. In a 528 ci+ engine I find it an incredibly MILD cam.
Let those thoughts out!!!

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Tubbed 40 Plymouth Coupe
Tubbed 71 Demon
1989 Shelby Lancer
1978 BB ClubCab
1973 Scamper 440 MHome

[DartGT66]

The 4.10 gears are no catastrophe with a tire that high, but I think too that you could run a higher gear ratio, maybe 3.91 but not less. I don't have my Indy catalog right here, but I believe this maamoth is a real torque monster with over 600 ft lbs through almos the whole rpm range. You have to take that in to account when choosing the converter. At least the range you have been planning isn't too low. Perhaps a lower 2200-2500 rpm stall converter with the 4.10 gears wouldn't be a bad idea considering you are going to pull something with the car. I think Indy sells Dynamic converters, and they might be able to give you the best hint. I think because of the massive torque it isn't going to be a low buck item despite of its relatively low stall speed, propably around 500$?

[ChristianCuda]

What I meant was I ran the figures you gave through the computer and going by what I had available the car may be better suited for 3.91 gears with all that torque. Besides 3.91 will live even better on the street. Remember going to a 4.10 ratio acts as a torque multiplier and with 600 ftlbs you may not need that much.

Christian


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68 'Cuda 383 Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360

[Marc]

Thanks for the info.

What do you think of the Indy Maxx aluminum block for a regularly driven street engine base? Anything I should look for in regards to the EFI? Anyone tried these tires yet?
Thanks again! Marc

[ChristianCuda]

the aluminum should be fine on the street afterall look at cadillac they have been running aluminum blocks in there cars for several years. As Long as the sleeves are steel and not aluminum also. I know that those blocks have always been meant for racers but then so was the 64 426 Hemi. So I would say go for it and way to be different. Definitely would keep the engine cooler and lighten up that front end. With a good set of aluminum heads you could almost run it without water. Which reminds me does that block have water passages? Or is it a solid block?

Well some more questions for you that I dont know. But if I find out I will post it for you.

Christian

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68 'Cuda 383 Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360

[Speedy#1]

Marc do a serch on marine engines ,i been seeing alot of high H P motors that use EFI so it can be used on street cars as well.I have also noticed alot of new and used engines really cheep too.i saw a few 440's rebuilt for $1,395, not bad!But i'm sure you could find something.

[morpower]

after researching this 528c.i. a freind of mine found only one bad thing about it its been bored so much theres not much cylinder left. so if you intend on a rebuild it will have thin walls (heat disipation problems ) causeing the cylinder walls to shift around. we came to the conclusion were going for the 472c.i. so we can rebuild it next year. just wanted to let you here so of the drawbacks.p.s. hemi's rule mopar or no car

[Marc]

Thanks for the warning on the block, but I've deciced to go a slightly different route.
I've contacted Indy and will probably run their Indy Maxx aluminum block, Indy Legend heads, 1200 cfm EFI, and a gear drive in either 528 ci or 588 ci. The aluminum block has lots of meat between the cylinders, looks well thought out, and the only drawback I can see is the price! The street cams they run seem REALLY small, but if it works, it works.
Anyone run an Indy street Hemi with the Indy Maxx block and/or the EFI setup??