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The book says it "dyno tested" 300+ . Gross or net ???
If he leaves it stock,. I agree with your carburetor assessment.
The 300 HP (gross) crate 360 is the 245 net HP stock magnum 5.9
The 300 hp crate is a stock truck long block, cam and all, with a intake swap. The 380 hp crate is the same long block with a single plane intake, a bigger cam, and different valve springs.
Why do they not recommend using the factory MPI or AC if it is just a stock motor? I wanted to use one in my Dakota but didn't because of this statement.
Because it's being sold as a "performance" replacement engine. The 300 hp version could easily use the factory efi and a/c. The 380 horse version could not
Well poop. Pretty misleading of them.
True, it is a gross rating. Just basic changes on the engine. The typical beginner bolt on hot rod parts. Does it suck that you can’t get the MP bump stick anymore? At the flywheel. What I did at the bottom..... Pretty cool what a few bolt on parts do huh? Good question. I wonder if it is an intake manifold fitting issue? That it interferes with the A/C bracket? Magnum style A/C issue? I think that’s it. Not so much the LA brackets. @Haney I plucked out a ‘00, Durango 5.9 for my ‘79 Magnum. Backed it with a 727 & 3.55 gears on 27 inch tires. What I did to the engine was; Installed a RPM & a 600 AFB carb w/a ‘72 trap door air cleaner housing a K&N filter. Junk yard distributor fired by a MP Chrome box. Hooker Super Competition 1-3/4 Headers into a 2-1/2 exhaust to the bumper. The 1-5/8 provides a little more torque for this particular application and I just used what I had on hand. The car is a good bit lighter, just under 3800lbs. vs what ever your truck weighs in at. So when it comes to a cam, I would keep it small for the added torque your looking for. You will not need a big lift. Just another 10*’s of duration is all you’ll need. If this was my situation that your in, besides the above of what I did, I would certainly select a Hyd. roller cam for a simple replacement swap. The cam itself is a tick over $300, but you reuse everything else. (Perhaps not the valve springs....) Though a new timing chain and chain tensioner would also come with the cam since your all ready there. You might as well! I found the (‘00) Magnum in my (‘79) Magnum a really nice power plant. Very torquey & with good HP for a strictly street bound daily driver. The 600 cfm carb was IMO an excellent match with really good pedal response and road manors. I’m sure a 750 would work. But I have seen no need for it unless I would be spending more time upstairs in the rpm range. Which is done early with the factory cam. I didn’t have the flex plate. I used a B&M flex plate to mate to the neutral balance converter. I also used Lokar cables for the throttle and trans kick down.
Pretty sure the 380 could to, unless the design of the intake prevented it, which may also be the issue with the 300 version.
The 380 used the MP single plane. I never noticed an A/C set up with that intake.
Edelbrock made 2 dual plain manifolds with the same part number. One has the bosses for the factory a/c and one doesn't. I also have a MI single plain manifold with the bosses. Also their ratings are with 1-5/8" headers and 750 carb.
I checked into this cause I want to put the factory Magnum a/c, alt, and belt setup on my 5.9 in my Dart. My MI dual plain doesn't have the bosses needed the mount the factory brackets.
There ya go! Thanks Mark. I figured that was the case.
Still think this was misleading of them. You could put the kagger intake on it and that would have everything for the factory MPI and A/C.
Perhaps... the factory / MP will make such statements to avoid things. It’s easier on there wallet to print a disclaimer rather than defend a frivolous law suits from dumb asses.
↑ Could you look through that catalog and find out the part number for the valve springs that was used in that 380 horse motor? Does it suck that you can’t get the MP bump stick anymore? I don't know if it sucks or not. I already have a 512 lift roller that I need springs for.
Hummm, I wonder if the valve spring is also in the MP book so you can find out the pressures of them. Or just call someone. Grab an aftermarket PAC spring.
PAC beehives would be my choice, should be something available in the pressures required for the cam.
Great first hand info! Thank you @rumblefish360 !
@rumblefish360 Thank you for sharing the experiences with your magnum!!
Anybody know the cam specs for a factory 1998 5.9?
Stock 5.2 Magnum: Duration: 251In./264Ex. Lift: .432"In/ .432"Ex Cam centerline 113* Stock 5.9 Magnum: Duration: 249In./269Ex. Lift: .410"In/ .417"Ex Cam centerline 109*
Thank you! Any idea what these durations are @0.050?
Not sure. I just happened to have the above #'s bookmarked.