Posted By: Anonymous
408 Magnum build, lets guess the HP and torque. - 02/16/09 06:29 AM
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.
Posted By: Mad Max
Re: 408 Magnum build, lets guess the HP and torque. - 02/16/09 08:36 AM
Gotta be close to 520 hp and 580 tq, at the crank.
Posted By: RangerDan440
Re: 408 Magnum build, lets guess the HP and torque. - 02/16/09 01:11 PM
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.
Posted By: patrick
Re: 408 Magnum build, lets guess the HP and torque. - 02/16/09 01:40 PM
I'll swagger 540hp 520 tq. are you going to have it dyno'd?
Posted By: Anonymous
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 01:19 AM
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 ).
Posted By: 69Cuda340S
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 04:29 AM
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.
Posted By: goldmember
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 04:41 AM
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.
Posted By: Anonymous
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 06:11 AM
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.
Posted By: goldmember
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 06:21 AM
That should be fun,short lived but intertaining.
Posted By: goldmember
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 06:27 AM
You are using a standalone EFI unit,I hope.
Posted By: Anonymous
Re: 408 Magnum build, lets guess the HP and torque. - 02/18/09 08:51 AM
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.