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Old 09-26-2003, 12:20 PM
tad tad is offline
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318 mopar build-up

looking to get 375-400 hp out of my 318. suggestions for pistons, cam ,heads etc. would like to stay with a hyd. cam. thanks
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Old 09-26-2003, 12:37 PM
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You can do it fairly easy with stock parts believe it or not. If you can find a set of #p4452748 heads, they have 1.88/1.60 valves and flow pretty good. #p4529588 heads are good to .500" lift stock. #p4529589 are okay to .550". I would try to run about 10 to 10.5:1 compression and a 230o to 240o @ .50" duration cam. Roller cams don't have as much improvement over the flat tappets on a SB Mopar. The tappets are wider on Mopars allowing higher lift to duration figures. Point being, use that to your advantage and get as high a lift as you can with the given duration you choose. Get a good dual plane intake and some nice headers and you should be pretty close to your mark.
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Old 09-26-2003, 12:40 PM
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thank-you!
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Old 09-30-2003, 10:35 AM
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Swirl port heads and a stout cam will make good power on your 318 but it will be barely streetable with the parts it takes to make a small cube motor turn out those kind of numbers (400 hp). If you have power brakes that will be one of many problems you encounter. Expect about 5" of vacuum at those HP levels. Reasonably, if you expect this car to be a daily driver you are looking at 300 horsepower with a decent set of heads, dual plane intake, 600 cfm carb, headers, dual exhaust. If it's an automatic you are looking at running a pretty loose converter to run a wild cam too, 220 duration at .050 lift is pushing it to be street friendly.

Car Craft has a nice write up on this month's issue of a 360 build up that hit the 400 horse mark. It would be barely streetable although it did use old smog castings for the heads.

I would spend the bucks on a 360 instead. If you price the pieces it's about the same to freshen/hop up a 360 as it is a 318. A 350 horse 360 will be as easy to live with as a 300 horse 318 except for the gas bill!
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Old 09-30-2003, 10:38 AM
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thanks-saw the article-i think the 360 is the way to go.
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Old 09-30-2003, 11:41 AM
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Actually, believe it or not it isn't as hard as you would think to build a powerful 318. I think that going for the bigger cubes is a better choice, but if you do stay with the 318, build it at least 10:1 compression. Then you can even use stock parts and come up with 400 hp. I have seen a few build ups usings stock cams and heads reach those levels. Mopar did make some decent parts. You just have to do your homework and find out which ones they were. Ask some of the guys on Moparchat. It is a Mopar chatroom. They will argue like mad for a while with each other but eventually they will come up with the part numbers for you.

http://www.moparchat.com/forums/index.php?s=
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Old 10-01-2003, 01:13 AM
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Lose the stock heads and find you a set of 340-X heads. Go with a dual plane intake - LD340 would be nice and they can still be found - not easy but thery are out there. Go with a Hughes dual pattern, fast rate cam. If you go beyond .500 lift you will have to change the valve springs on the X-heads or you may encounter coil bind. Hughes will help you through this. If you get a set of X-heads have a radius cut valve job. This gets the actual seating of the valve very close to it's edge and improves flow tremendously. You are going to make all your power on top and the bottom end goes along for the ride. A good - light - reciprocating mass engine means more power. The heads are your big ticket to horsepower. They can act as a govenor to the engine if they don't flow enough air. You are building an air pump - more air in, more air out, equals more HP.

That said, don't forget the exhaust. I hate headers, but you may need them unless you can round up a set of the T/A HP exhaust manifolds. They are killer and will perform nearly as well as a set of headers and are so much less trouble. If you find them, go to NAPA and get the exhaust doughnuts for a 94 Jeep six banger. They are taller and less likely to leak than the stock 340 version.

Don't worry about cast crank vs. forged unless you are going with a big shot of juice. I'm afraid the 10 bolt head design of the MoPar Smallblocks wouldn't like it for long.

'cudabob
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Old 10-01-2003, 08:57 AM
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thanks for the great info!
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