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gen1dak
Dodge Dakota
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11/08/2004
19:41:00
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 Subject: RE: Magnum heads on pre-mag block?
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Man that CC tech guy's answer just burns my ass. Saying the cams are for V8 Magnum only. I guess that's why the 3.9 Magnum and 5.2 Magnum have the same cam? They have the same head design, same intake/exhaust ports. The same frickin' cam specs will perform the same way in that V6. Your power will be down proportionately with 2 less cylinders.
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Karl
Dodge Dakota
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11/15/2004
09:52:48
| RE: Magnum heads on pre-mag block?
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This is useful information--I wish I had known some of this stuff a year ago when I started collecting parts for a magnum head swap on my 1990 5.2. Basically I'm putting magnum heads off a 1999 motor on my existing LA block--I considered a full swap to MPI but decided it was too much of a headache. So my strategy now is to use my existing TBI (w/ 4bbl to 2bbl adapter) on an aftermarket 4bbl dual plane intake meant for swapping to magnum heads on a pre-magnum engine. The existing hydraulic roller lifters and hollow pushrods seem to be the right type for magnum heads. I'm retrofitting a set of old headers for the 02 sensor.
The only real problem I'm seeing now is the EGR system. Just how much grief should I expect from disrupting the EGR? Are enhancing the spark for more complete combustion and running premium fuel viable ways to compensate for the lack of exhaust gas in the air/fuel mix? Another thing I was considering is fabricating some sort of small box with metal tubes sticking out the bottom to mount the EGR valve on. This would then be grafted onto one of the header pipes. Does this seem like a workable hack or is this idea more or less in the ill-concieved category? I guess I'm not sure why the EGR is located on the intake manifold in a stock setup, and I'm not sure how important this is. I feel like I must be missing some important concept here. I'm basically teaching myself as I go so I don't have a lot of experience with automotive work. Thanks in advance for any feedback you guys can provide.
Best Regards,
Karl
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Karl
Dodge Dakota
JOIN HERE
11/15/2004
10:06:03
| RE: Magnum heads on pre-mag block?
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Message:
This is useful information--I wish I had known some of this stuff a year ago when I started collecting parts for a magnum head swap on my 1990 5.2. Basically I'm putting magnum heads off a 1999 motor on my existing LA block--I considered a full swap to MPI but decided it was too much of a headache. So my strategy now is to use my existing TBI (w/ 4bbl to 2bbl adapter) on an aftermarket 4bbl dual plane intake meant for swapping to magnum heads on a pre-magnum engine. The existing hydraulic roller lifters and hollow pushrods seem to be the right type for magnum heads. I'm retrofitting a set of old headers for the 02 sensor.
The only real problem I'm seeing now is the EGR system. Just how much grief should I expect from disrupting the EGR? Are enhancing the spark for more complete combustion and running premium fuel viable ways to compensate for the lack of exhaust gas in the air/fuel mix? Another thing I was considering is fabricating some sort of small box with metal tubes sticking out the bottom to mount the EGR valve on. This would then be grafted onto one of the header pipes. Does this seem like a workable hack or is this idea more or less in the ill-concieved category? I guess I'm not sure why the EGR is located on the intake manifold in a stock setup, and I'm not sure how important this is. I feel like I must be missing some important concept here. I'm basically teaching myself as I go so I don't have a lot of experience with automotive work. Thanks in advance for any feedback you guys can provide.
Best Regards,
Karl
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Karl
Dodge Dakota
JOIN HERE
11/15/2004
10:06:09
| RE: Magnum heads on pre-mag block?
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Message:
This is useful information--I wish I had known some of this stuff a year ago when I started collecting parts for a magnum head swap on my 1990 5.2. Basically I'm putting magnum heads off a 1999 motor on my existing LA block--I considered a full swap to MPI but decided it was too much of a headache. So my strategy now is to use my existing TBI (w/ 4bbl to 2bbl adapter) on an aftermarket 4bbl dual plane intake meant for swapping to magnum heads on a pre-magnum engine. The existing hydraulic roller lifters and hollow pushrods seem to be the right type for magnum heads. I'm retrofitting a set of old headers for the 02 sensor.
The only real problem I'm seeing now is the EGR system. Just how much grief should I expect from disrupting the EGR? Are enhancing the spark for more complete combustion and running premium fuel viable ways to compensate for the lack of exhaust gas in the air/fuel mix? Another thing I was considering is fabricating some sort of small box with metal tubes sticking out the bottom to mount the EGR valve on. This would then be grafted onto one of the header pipes. Does this seem like a workable hack or is this idea more or less in the ill-concieved category? I guess I'm not sure why the EGR is located on the intake manifold in a stock setup, and I'm not sure how important this is. I feel like I must be missing some important concept here. I'm basically teaching myself as I go so I don't have a lot of experience with automotive work. Thanks in advance for any feedback you guys can provide.
Best Regards,
Karl
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Karl
Dodge Dakota
JOIN HERE
11/15/2004
10:06:26
| RE: Magnum heads on pre-mag block?
IP: Logged
Message:
This is useful information--I wish I had known some of this stuff a year ago when I started collecting parts for a magnum head swap on my 1990 5.2. Basically I'm putting magnum heads off a 1999 motor on my existing LA block--I considered a full swap to MPI but decided it was too much of a headache. So my strategy now is to use my existing TBI (w/ 4bbl to 2bbl adapter) on an aftermarket 4bbl dual plane intake meant for swapping to magnum heads on a pre-magnum engine. The existing hydraulic roller lifters and hollow pushrods seem to be the right type for magnum heads. I'm retrofitting a set of old headers for the 02 sensor.
The only real problem I'm seeing now is the EGR system. Just how much grief should I expect from disrupting the EGR? Are enhancing the spark for more complete combustion and running premium fuel viable ways to compensate for the lack of exhaust gas in the air/fuel mix? Another thing I was considering is fabricating some sort of small box with metal tubes sticking out the bottom to mount the EGR valve on. This would then be grafted onto one of the header pipes. Does this seem like a workable hack or is this idea more or less in the ill-concieved category? I guess I'm not sure why the EGR is located on the intake manifold in a stock setup, and I'm not sure how important this is. I feel like I must be missing some important concept here. I'm basically teaching myself as I go so I don't have a lot of experience with automotive work. Thanks in advance for any feedback you guys can provide.
Best Regards,
Karl
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vern
Dodge Dakota
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11/15/2004
15:03:24
| RE: Magnum heads on pre-mag block?
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karl-are you in a state that requires the egr for inspection? if not then don,t worry about it.
the egr is no more then a exh gas valve,it lets the motor reburn the gases in the exh.
if you need the egr,then this is how i would plump it,on both exh manifolds next to the firewall theres a pipe that goes to each manifold and to the fresh air pump on the front of the motor,i,d use the pipe from one of the manifolds to the intake to the cross over[heat riser]part of the intake,drill and tap this cross over section and pipe the exh manifold to the intake.
i have,nt done this,but i think this will work to keep the egr operating.you can ask others for their opinions
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gen1dak
Dodge Dakota
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11/15/2004
20:03:46
| RE: Magnum heads on pre-mag block?
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Karl, while it's probably do-able, it's gonna be a hokey setup. I'm not sure how much it'd cost to do what you're talking about, but you'd save yourself a helluva lot of heartache if you ordered these: P4876179. They're ready to bolt on, with springs good to .5 valve lift, plenty for your app. Also a bargain. An eBay sale of the Magnum heads would offset the cost. Then, you'd have stock-appearing heads that have over 44% improved intake flow as well as better exhaust, and are the best LA heads (pre-Magnum, and within about 10hp at 6000 rpm compared to Magnums). Then slap on your choice of intakes (The standard Edelbrock Performer intake is 50-state emissions-legal). Make sure you get an EGR-version of the Performer. Using the 4V to 2V adapter you mentioned, you could even use an el-cheapo 360 LA cast iron intake. I say 360, because the P4876179 heads are of 360 LA sized ports and valves. Then all your stock EGR stuff will bolt right up. Not exactly what you were asking, but tons easier, and if you paint the intake the same as the engine, it'll even look stock with the air cleaner in place. Without EGR, the computer will kick error codes, and while it may run fine, it may not, and it will not pass emissions without it. Enhancing the spark and using premium fuel will not reduce NOX emissions. The EGR allows a reduction in NOX be recirculating some of the exhaust gases into the intake flow. This reduces peak combustion temperatures which helps reduce NOX. This is why, when EGR valves malfunction, engines that never "pinged" before, suddenly start pinging.
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Karl
Dodge Dakota
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11/17/2004
17:00:34
| RE: Magnum heads on pre-mag block?
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Ok-thanks for the input. I don't need to worry about passing emissions now, but I might relocate in the not-to-distant future, in which case the NOX situation would be a concern. I'll likely just button up the magnum head swap I'm working on presently, and save up for the P4876179 castings. Either that or get my old heads machined. Thanks again.
-Karl
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Joel
Dodge Dakota
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8/26/2008
06:59:59
|  RE: Magnum heads on pre-mag block?
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I have been looking into swapping in a Magnum V6 for awhile now. I wanted to keep it simple and stick with the factory carburetor setup. My only concern was whether the pre-Magnum manifold would fit the Magnum head and block. Its good to know that with just a little drilling and tapping, is all that is needed to make it work, nice.
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