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  #41  
Old 01-03-2012, 10:50 PM
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Originally Posted by bigmikelrg View Post
I'd highly recommend a dual pattern cam (different lift and/or duration for intake vs exhaust valves). Most stock heads do not flow well, and even worse on the exhaust side. It would be helpful to get a cam with a little bit more lift and/or duration on the exhaust side. IMO duration is more critical than lift, most usually talk about lift but I would concentrate on the duration..............this was posted to me is this meaning buy the cam according to the heads or I can just buy what ever heads and just gut what u said a .500 lift cam?
Whoever posted that to you must not know that the with stock magnum heads you cannot have a lift of more then .495" if you go any larger you will damage the engine, the piston will TDC while the valve is open and the piston will snap the valve and the valve will destroy the piston and possibly the cylinder wall thus destroyed block.

This person is correct about the breathing of the magnum engine. It is poor but can be improved. You don't have to spend a large amount of money on a CAM to get larger lift and a larger time span. You can simply increase the rocker ratio. The larger rocker ratio means the valve will open larger and stay open longer but the same principle applies if valve is open to far it will meet Mr.Piston.

The performance mopar magnum heads decrease the size of the combustion chamber this will then increase the compression ratio meaning more HP. The best part is that you can use the stock ECM. You can also change the rocker ratio and the CAM however the CAM changes can only be to the lift and time and it has to be within a certain limit or the ECM will have issues with timing. The rocker ratio you can change with the stock ECM. The stock ratio I believe is 1.6 you can go 1.7 it's not much but it's better then nothing. Duration can be substituted with lift, obviously the more lift the longer it will be open. If you have it open longer duration you get a sausage CAM however the longer duration may run into a overlap and might cause issues with the ECM. The ECM is familiar with the stock everything. Else wise chrysler wouldn't of made it like that!
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  #42  
Old 01-04-2012, 04:02 AM
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Ok cool is it possible for u to post a link for an ideal cam for me I have no idea what all the number are when there listed wile looking up cams and many a sight where I can see some heads that would go good with the cam or vise versa meaning cam good with heads? That would be MUCH help and did u ever take a look at stroker kits?
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  #43  
Old 01-04-2012, 01:11 PM
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Originally Posted by bigmikelrg View Post
Ok cool is it possible for u to post a link for an ideal cam for me I have no idea what all the number are when there listed wile looking up cams and many a sight where I can see some heads that would go good with the cam or vise versa meaning cam good with heads? That would be MUCH help and did u ever take a look at stroker kits?
I can try to find you a decent cam. To be honest you might be better off buying a cam that has the same specs except for it being performance. I haven't gotten a chance to really look at any stroker kits because I have been getting myself ready for my drive because I have to go back to school.
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  #44  
Old 01-04-2012, 01:31 PM
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Whoever posted that to you must not know that the with stock magnum heads you cannot have a lift of more then .495" if you go any larger you will damage the engine, the piston will TDC while the valve is open and the piston will snap the valve and the valve will destroy the piston and possibly the cylinder wall thus destroyed block.
I posted that comment in another thread. I never said anything about a specific lift amount. I was just recommending to get a cam that has more lift and/or duration on the exhaust side. Most if not all factory heads are restrictive all around, but more so on the exhaust side.

Quote:
This person is correct about the breathing of the magnum engine. It is poor but can be improved. You don't have to spend a large amount of money on a CAM to get larger lift and a larger time span. You can simply increase the rocker ratio. The larger rocker ratio means the valve will open larger and stay open longer but the same principle applies if valve is open to far it will meet Mr.Piston.
A higher rocker ratio will give you slightly more lift, but it does not change the duration. The cam profile alone determines duration. You can gain a small increase (with a good amount of labor) by increasing rocker ratio, but I'd still recommend if you want to do this then just do the cam because you'll gain a lot more for little more work. Increasing the rocker ratio will not give huge results either because you're increasing the intake as much (actually more) than the exhaust. You want exhaust to be about 70% of what the intake is. If you increase the ratio equally then you still have the same stock proportion of flow from intake to exhaust.

You need to match all the components with your build. The cam will have a certain power band and certain use able rpm's, the heads will also have a certain rpm where they don't flow well anymore, etc. When everything is matched properly you get the best performing results. I'd do some more research before you order parts based on one persons input. I mean no offense to ramvan he has some good info but some is not spot on as well. I'd just make sure you know what you are ordering before you order it, or parts may not go together the way you're hoping. It'd be best to try to do some research and learn a little more about how it all works, it's really not all that hard, just put in a little time here and there then in a few months you'll know everything you need to know to order a cam and make a decision about heads. This way you'll get what you really want.
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  #45  
Old 01-04-2012, 03:13 PM
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Ok cool thx man so a stroker kit cums with Kit includes forged 4340 steel crank, 4340 I-Beam rods, Diamond Forged pistons, Diamond piston pins, rod bearings, main bearings, & piston rings. So all I need to do is match heads I'd kit comes with all this and boar the motor?
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  #46  
Old 01-04-2012, 03:25 PM
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Ok cool thx man so a stroker kit cums with Kit includes forged 4340 steel crank, 4340 I-Beam rods, Diamond Forged pistons, Diamond piston pins, rod bearings, main bearings, & piston rings. So all I need to do is match heads I'd kit comes with all this and boar the motor?
Well I don't think they cum anything....lol but yeah a forged rotating assembly is a great start. It will be very strong. Also, the lighter it is the easier/faster it will rev, giving more hp. You can have the crank lightened at a machine shop (they basically just drill holes in it, but they computer balance it). If the cylinders don't need bored I wouldn't do it, just hone it. If they do need bored, do as little as possible (or as to the smallest common size for the pistons/rings). The little bit of gained displacement is negligible in terms of power increase, and you want the cylinder walls as thick as possible. What's the stroke and bore stock vs what it will be once stroked? The closer to square the engine is (stroke and bore being the same) usually the better it is. That's not to say other combinations don't perform well, but they all perform differently. Shorter stroke will spin faster/easier, longer stroke gives more torque, typically. Are you talking with a machine shop about doing the work?
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  #47  
Old 01-04-2012, 05:18 PM
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No I just wanted to do it it was refers to me because a stroker moter is the best way to archive close or meet 450-500 horse and a stroker motor is meant to produce allot of torque the kit said boar .60 over and it's a kit to boar my 318ci to a 410ci and yes I was gona take it to a shop to b professionally done after I get the kit and thx ramvan for the help.
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  #48  
Old 01-04-2012, 08:16 PM
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Ok that's a good displacement increase! You should be able to get at least 1hp/cubic inch so at least 410 hp. If you do a lot of research and get a good combination of parts together you can achieve 1.25hp/cubic inch pretty easy too...

60 over is a lot to bore, I would definitely check with the machine shop and get their opinion. Some block castings aren't safe from cracking with that much removed, some are. I'm not familiar with this engine so really don't know, but they can tell you for sure...
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  #49  
Old 01-04-2012, 11:39 PM
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Quote:
Originally Posted by snrusnak View Post
I posted that comment in another thread. I never said anything about a specific lift amount. I was just recommending to get a cam that has more lift and/or duration on the exhaust side. Most if not all factory heads are restrictive all around, but more so on the exhaust side.



A higher rocker ratio will give you slightly more lift, but it does not change the duration. The cam profile alone determines duration. You can gain a small increase (with a good amount of labor) by increasing rocker ratio, but I'd still recommend if you want to do this then just do the cam because you'll gain a lot more for little more work. Increasing the rocker ratio will not give huge results either because you're increasing the intake as much (actually more) than the exhaust. You want exhaust to be about 70% of what the intake is. If you increase the ratio equally then you still have the same stock proportion of flow from intake to exhaust.

You need to match all the components with your build. The cam will have a certain power band and certain use able rpm's, the heads will also have a certain rpm where they don't flow well anymore, etc. When everything is matched properly you get the best performing results. I'd do some more research before you order parts based on one persons input. I mean no offense to ramvan he has some good info but some is not spot on as well. I'd just make sure you know what you are ordering before you order it, or parts may not go together the way you're hoping. It'd be best to try to do some research and learn a little more about how it all works, it's really not all that hard, just put in a little time here and there then in a few months you'll know everything you need to know to order a cam and make a decision about heads. This way you'll get what you really want.
Well with stock heads you can't have to much lift like said only .495 is the max any more lift and well that's it. If you change the rocker ratio you will have more duration very small amount more but more. I won't really be able to help this fella much anymore because back to school and I won't have time, I also have to go back and replace my rear planet in my transmission.
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  #50  
Old 01-04-2012, 11:42 PM
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I do have one thing to say, when it comes time to rebuild the transmission I'm a authority on that. The primitive of torqueflites, I'm a authority (consider self). I can admit engines I'm not great, but 46-48, 727. So when you rebuild It I am more then happy to help with modifications I can even rebuild it for you.
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