408 Magnum
#1707456
12/07/14 12:29 AM
12/07/14 12:29 AM
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Joined: Nov 2003
Posts: 12,494 Western Colorado High Desert
moparmarks
OP
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OP
I Live Here
Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
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Planning on stroking a 5.9 to a 408. Will it have enough air flow with the stock EFI throttle body and intake? Was going to use Eddy heads. Thanks
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: 408 Magnum
[Re: Rob C]
#1707458
12/07/14 11:43 AM
12/07/14 11:43 AM
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Joined: Nov 2003
Posts: 12,494 Western Colorado High Desert
moparmarks
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OP
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Posts: 12,494
Western Colorado High Desert
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Going in my Dart with a manual tranny for street use. 355 gears Shooting for 10-10.5 CR. Edelbrock says their heads flow 251 at 500" lift. Probably will go with 500-540" lift cam. I'm just in the planning stages.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: 408 Magnum
[Re: gch]
#1707461
12/07/14 12:31 PM
12/07/14 12:31 PM
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Joined: Nov 2003
Posts: 12,494 Western Colorado High Desert
moparmarks
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OP
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Posts: 12,494
Western Colorado High Desert
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Was hoping for around 450HP. I want to drive this car all over, Vegas, CA and maybe Carlisle. I want EFI without spending 2000.00 for it and is why I'm looking at the factory setup. One reason I want EFI is that we have more change in altitude just in my county than most states do, 4300'-10800'. Does anyone make a larger throttle body?
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: 408 Magnum
[Re: moparmarks]
#1707466
12/08/14 08:16 PM
12/08/14 08:16 PM
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Joined: Jan 2003
Posts: 12,861 Gloucester,VA STOP MOVING HERE
RangerDan440
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I Live Here
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Gloucester,VA STOP MOVING HERE
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use an M1 intake and 48 lb/hr injectors, especially if you are using a stickshift
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
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Re: 408 Magnum
[Re: WO23Coronet]
#1707469
12/09/14 02:31 PM
12/09/14 02:31 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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Well, reading some comments by people who have approximated the Hughes mods to the keg, which involve shortening up the runner length inside the keg, low end torque is reduced by the mods.
If one had a decent budget the Hughes/Edelbrock injection manifold looks really nice and has the advantage that one could run a four-barrel on it in a pinch. But maybe they have a better idea which is why I suggest direct contact, rather than speculation which is what I'm doing here.....
One thing for sure, camshaft selection is critical with factory EFI, even if it's been modified some. And that's another Hughes specialty.
Another way to go would be a stock keg with a light pressure turbo, just 4-5 psi to help the air through the runners.
One last thing, there have been plenty of guys hotrodding the Mag motors in pickups and there is a lot of info out there on the Web about what works and what doesn't.
R.
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Re: 408 Magnum
[Re: dogdays]
#1707470
12/09/14 07:16 PM
12/09/14 07:16 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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I Live Here
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Posts: 12,419
Kalispell Mt.
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The Hughes air gap is real nice above about 3000 RPM, it kills a lot of TQ down low VS beer barrel, I know from personal experience. The one thing you can not aproximate with the beer barrel is the air gap. The plate on the bottom of the beer barrel heats up the air in the plenum really bad. Maybe one could glue a sheet of phenolic resin on the bottom of the plate to insulate it, I have also added a sheet metal layer over the lifters and such to keep the hot oil from splashing all over the bottom plate. I suspect the kegger could make significantly more power if you could keep that heat away from it. When it was 7* below zero F the other day my IAT never dropped below about 97* once the engine was warmed up good and that was cruising at 75mph, around town it was showing about 110* most of the time. I put a hughes air gap on one one time and moved the IAT into the runner like factory and it was waaaay cooler but still lost power down low.
If your doing a budget EFI you can run the kegger for now then when your wallet recovers you can grab the hughes. Your Dart will probably not miss the TQ like a Ram 2500 with a 5.9.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 408 Magnum
[Re: HotRodDave]
#1707471
12/09/14 08:26 PM
12/09/14 08:26 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Mark, I've built a few of those magnum motors by now in my Dakota, I have a stock short block, cam, headers, Edelbrock heads, M1 4bbl intake with 2bbl adapter, and an F&B 58mm TB the whole thing bolts into my truck like a stock production motor. You can get what you want easily. Stock computer, wire harness for EFI, use SCT to tune the computer to your CID and cam specs. there are 2 top SCT tune writers I would suggest to you. but, to answer JUST the question you asked, Yes, there are larger aftermarket 2bbl TBs that bolt on like stock, and use stock sensors. F&B is probably the best you'll find. they offer different sizes too. for a 450hp 408, I would suggest either their 55mm or 58mm TB.
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