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95 Dakota - Engine Build/Swap 318/360/Stroker?

Posted By: dart440

95 Dakota - Engine Build/Swap 318/360/Stroker? - 06/18/13 11:55 PM

A friend has a 1995 Dakota 4WD with a 318 magnum and manual transmission. The engine is getting tired and I am helping him with options (he is in CA).
1) Should we rebuild/build the 318 magnum or swap in a 360 magnum?
2) If building the 318 magnum, what improvements do you suggest?
3) If swapping in a 360 magnum, what issues are we going to run into (motor mounts, flywheel/clutch/pilot bearing issues, computer, etc)???
4) Building a stroker. Nothing wild, just more cubes to get more power/torque...around 350-360 cubes.
Usage Info: Not a race truck. Truck will be used for lite hauling (off-road motorcycles and misc., a little bit of off-roading and mostly as a transportation vehicle. He wants more power and torque. Since he only wants to build a 305-360 cubic inch stroker 318, I told him it would be cheaper to swap in a 360 magnum. We have to keep it "smog legal" (sort of for CA). Anyone do this swap???
We were thinking of some porting on the heads and intake, installing a larger throttle body, slightly bigger cam (recommendations?) and maybe swapping heads), smog legal headers, bigger exhaust through the catalytic converter, etc.
Thanks in advance for your ideas!!!
Posted By: dogdays

Re: 95 Dakota - Engine Build/Swap 318/360/Stroker? - 06/19/13 12:18 AM

The Magnum engine is held back by the "beer barrel" intake. If rebuilding the 5.2, use of a 4" crank will get around 390 cubic inches, makes more sense to me than going with a 3.58" stroke. But the 5.9 will get to 366 with a cleanup bore. Depends on what you can find. Either way, the intake limits. Putting a bigger motor under it moves the torque curve down.

If you have to pass emissions, pay attention to camshaft compatibility. There are a few companies out there who have specialized in Mag motors, better ask them.

If it were me, I'd look for the 5.9. If I couldn't find a decent one, the 5.2 would get a 4" crank. I am not sure about the heads' porting capacities, again better ask. There is a very expensive M1 MPFI single plane intake that MAY have a CARB exemption, maybe not. If not, then cutting the runners shorter inside the beer barrel (Hughes Engines) can increase the power curve.

R.
Posted By: dart440

Re: 95 Dakota - Engine Build/Swap 318/360/Stroker? - 06/19/13 09:47 PM

Thanks for the info.

Will the 360 bolt in place of the 318, or are there differences to the motor mounts, like on the 318/360 LA swap?

It'll all be balanced and have the correct flywheel for the 360.

My friend was thinking not going really big on the cubes for a stroker, as the 318 can go to about 390 cid, and the 360 over 400 cid.

The truck is going to be used mostly on the street and a little off-roaading, as well as hauling/light towing.
Posted By: dogdays

Re: 95 Dakota - Engine Build/Swap 318/360/Stroker? - 06/19/13 10:13 PM

I am not sure about 5.2/5.9 differences in motor mounts, someone else does.
When talking about Magnum motors, don't call the 5.9Mag a 360! It has a different factory imbalance than the 360. Something like 4 oz-in difference, which you'll certainly feel if you get the wrong one.

R.
Posted By: dart440

Re: 95 Dakota - Engine Build/Swap 318/360/Stroker? - 06/19/13 11:58 PM

Thanks for the info.

Will the 360 bolt in place of the 318, or are there differences to the motor mounts, like on the 318/360 LA swap?

It'll all be balanced and have the correct flywheel for the 360.

My friend was thinking not going really big on the cubes for a stroker, as the 318 can go to about 390 cid, and the 360 over 400 cid so I think a 360 Mangnum engine swap will be the most cost effective.

The truck is going to be used mostly on the street and a little off-roaading, as well as hauling/light towing.
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