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#226387 - 02/15/09 11:29 PM 408 Magnum build, lets guess the HP and torque.
Anonymous
Unregistered


I am currently building a 360 Magnum with a 4 inch crank. The build consists of 4 inch eagle crank, eagle i beam rods, ross stroker pistons that come in at 10.2:1 with my heads. The cam is a KRC performance grind that is 242/246 @ .050, 586/600 lift on a 108 lsa. Edelbrock magnum heads with bowl work and valve job by modern cylinder head, comp beehive valve springs and lightweight retainers. PEP 1.6:1 roller rockers, hardened pushrods, and mopar hydraulic roller lifters. The intake is a Hughes/Edelbrock rpm air gap efi piece that has been deep port matched, the throttle body is a hughes stage 2 972 cfm piece, and 30 lb. an hour fuel injectors. Stock distributor, Melling HV oil pump, Dakota R/T oil pan and MSD ignition rounds it out.

Lets see what you guys think, I have a number in mind give or take 15 HP and 10 ft. lbs. of torque.

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#226388 - 02/16/09 01:36 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
Mad Max Offline
member

Registered: 01/04/07
Posts: 23
Loc: Peyton, CO
Gotta be close to 520 hp and 580 tq, at the crank.


Edited by Mad Max (02/16/09 01:42 AM)
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#226389 - 02/16/09 03:19 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: Mad Max]
2boltmain Offline
master

Registered: 07/26/03
Posts: 3550
Loc: MI Allegan county
565hp 530lbs tq.

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#226390 - 02/16/09 06:11 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
LTDan Offline


Registered: 01/20/03
Posts: 12790
Loc: Gloucester,VA STOP MOVING HERE
I can tell you what my dyno'd 408 Magnum is:
cast MP crank
Ross 9:1 pistons
Eagle H-Beam rods
stock iron R/T heads
MP 1.6 roockers
Comp/KRC cam .510 224/228
MP M1 EFI intake
24 lb/hr injectors
MP throttle body
computer reflash by KRC

381 RWHP in a 4400-lb Ram, so roughly 450 crank HP. When I was building it, Desktop dyno said it was good for 480 HP. I kept mine pretty mild since its mainly a fun street cruiser; I say yours will be good for a about 490-500 crank HP.
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#226391 - 02/16/09 06:40 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: 2boltmain]
patrick Offline
I Live Here

Registered: 01/20/03
Posts: 16102
Loc: Grand Haven, MI
I'll swagger 540hp 520 tq. are you going to have it dyno'd?
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#226392 - 02/17/09 06:19 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: patrick]
Anonymous
Unregistered


I am going to have it chassis dynoed, but not until May or June. I am guessing 490-500 as well. Its nice to hear that some of you agree. This is going in a 94 Dakota standard cab, short bed, 2WD truck. It should be a handfull. All I want to see is 11.99 and I will be happy ( At least for a little while ).

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#226393 - 02/17/09 09:29 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
69Cuda340S Offline
master

Registered: 08/02/04
Posts: 3250
Loc: MARYLAND
Looks like a nice build. I would think you could pick up a bunch of power by fully porting those heads, especially with that cam.
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#226394 - 02/17/09 09:41 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
goldmember Offline
master

Registered: 02/16/04
Posts: 4501
Loc: Gainesville,FL
You'll have no problem getting an 11.99 out of it with traction. As far as guessing HP 500 and 500 ish.Flywheel numbers,not rear wheel. Some dyno's may give a better number and if it was dyno'd for a magazine it would add some nice HP. Sounds like a nice combo for what you want to do. With the correct converter and well tuned it could run well below what your looking for.


Edited by goldmember (02/17/09 09:42 PM)

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#226395 - 02/17/09 11:11 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: goldmember]
Anonymous
Unregistered


That is my limiting factor though, it is a manual trans truck. It has the stock NV 3500 5 speed in it for now. We will see how long that thing lasts. If and when it goes I will be going with a 904 with a loose converter and a manual valve body. For now though, it will be a NV 3500 bash fest.

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#226396 - 02/17/09 11:21 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
goldmember Offline
master

Registered: 02/16/04
Posts: 4501
Loc: Gainesville,FL
That should be fun,short lived but intertaining.

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#226397 - 02/17/09 11:27 PM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
goldmember Offline
master

Registered: 02/16/04
Posts: 4501
Loc: Gainesville,FL
You are using a standalone EFI unit,I hope.

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#226398 - 02/18/09 01:51 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: goldmember]
Anonymous
Unregistered


Actually, im using a stock style obd 2 computer tuned with an sct tuner. Stock style carter in tank pump and fuel rails. Marty at KRC said I should have no problem using those parts with som programs he has already tested on his 03 hemi ram.

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#226399 - 02/18/09 05:58 AM Re: 408 Magnum build, lets guess the HP and torque. [Re: ]
patrick Offline
I Live Here

Registered: 01/20/03
Posts: 16102
Loc: Grand Haven, MI
Quote:

That is my limiting factor though, it is a manual trans truck. It has the stock NV 3500 5 speed in it for now. We will see how long that thing lasts. If and when it goes I will be going with a 904 with a loose converter and a manual valve body. For now though, it will be a NV 3500 bash fest.




good luck with that. the NVG3500 is rated for 340 ft-lbs, that's why 360's were never available with a manual in half-ton pickups. when it goes, I'd probably look towards a tremec TKO over a 904...
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1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2006 Inferno Red Dodge Caravan SXT 2011 Toxic Orange Dodge Charger R/T

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