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408 Magnum build, lets guess the HP and torque. #226387
02/16/09 02:29 AM
02/16/09 02:29 AM

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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.

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226388
02/16/09 04:36 AM
02/16/09 04:36 AM
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Peyton, CO
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Gotta be close to 520 hp and 580 tq, at the crank.

Last edited by Mad Max; 02/16/09 04:42 AM.

'68 Charger R/T
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'93 Ramcharger W150 LE
'93 Cummins Ram
Re: 408 Magnum build, lets guess the HP and torque. [Re: Mad Max] #226389
02/16/09 06:19 AM
02/16/09 06:19 AM
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Holland MI Ottawa
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2boltmain Offline
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565hp 530lbs tq.


Keep old mopars alive.
Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226390
02/16/09 09:11 AM
02/16/09 09:11 AM
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Gloucester,VA STOP MOVING HERE
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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.


68 Valiant 408
69 Charger 318
69 Cougar 351W
70 Torino GT 351C
71 Country Squire 351W
71 Road Runner 440+6
71 Satellite sedan 318
73 Duster 318
73 Challenger 383
77 Grand Prix 455
83 Malibu 9C1 383
84 Delta 88 403
87 Grand National
96 Ram 360
09 Crown Vic
10 Challenger R/T M6
15 Challenger Hellcat M6
Re: 408 Magnum build, lets guess the HP and torque. [Re: 2boltmain] #226391
02/16/09 09:40 AM
02/16/09 09:40 AM
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Posts: 16,122
Grand Haven, MI
patrick Offline
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I'll swagger 540hp 520 tq. are you going to have it dyno'd?


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: 408 Magnum build, lets guess the HP and torque. [Re: patrick] #226392
02/17/09 09:19 PM
02/17/09 09:19 PM

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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 ).

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226393
02/18/09 12:29 AM
02/18/09 12:29 AM
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MARYLAND
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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.

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226394
02/18/09 12:41 AM
02/18/09 12:41 AM
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Gainesville,FL
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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.

Last edited by goldmember; 02/18/09 12:42 AM.
Re: 408 Magnum build, lets guess the HP and torque. [Re: goldmember] #226395
02/18/09 02:11 AM
02/18/09 02:11 AM

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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.

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226396
02/18/09 02:21 AM
02/18/09 02:21 AM
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Gainesville,FL
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That should be fun,short lived but intertaining.

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226397
02/18/09 02:27 AM
02/18/09 02:27 AM
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Gainesville,FL
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You are using a standalone EFI unit,I hope.

Re: 408 Magnum build, lets guess the HP and torque. [Re: goldmember] #226398
02/18/09 04:51 AM
02/18/09 04:51 AM

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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.

Re: 408 Magnum build, lets guess the HP and torque. [Re: ] #226399
02/18/09 08:58 AM
02/18/09 08:58 AM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
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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...


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)






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