Factory Magnum Heads

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DodgeFreak said:
Does anyone have an idea why on the intake side they put that bump in the port?? Whats that for? Also besides the stud rocker arms would the TBI heads be better than magnum heads as they still have the swirlport also?? From what i've got with this people should keep the heads the same and spend the money to convert magnums to the LA heads if the la's flow better than the magnums anyways. Can you do flow numbers on the TBI swirlports as a comparison?
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I believe the bump your referring too is because one of the head bolts is above it and the extra material (bump) is needed for strength. I found that out the hard way the first time I ported a set. Went through and had to have it welded up. You can smooth it down but don't take any more off than necessary. I don't know flow numbers for the earlier swirl port heads so I don't know if there is an advantage there but the magnums have closed chambers which is an advantage. It will tolerate more compression ratio than open chambers do.
 
There are wo bumps one is the pushrod bump and the other is fro the rocker arm bolt.
 
But they are the EQ heads and the one that I have is a factory casting. So this may be the difference.
 
Might be. Cant see them being radically different though.
 
I thought....thats scarry...I read somewhere the ports are actually slightly different.
 
rumblefish360 said:
I thought....thats scarry...I read somewhere the ports are actually slightly different.
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Stage 1: Stock replacement, with our 1.5 rocker arms, springs, retainers and SS valves $1595.00

Not much different than buying eddies.
 
needsaresto said:
Stage 1: Stock replacement, with our 1.5 rocker arms, springs, retainers and SS valves $1595.00

Not much different than buying eddies.
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Hum, yep, application dependent at that price.
 
Hey BJR!

You probably already know this info,but I thought I'd pass it on.

There was an article in a mag ( I know,their selling stuff) about maximizing the magnum. Dec/Jan 08 issue of Mopar enthusiast.

About a company called Tico racing. Talked about the flaws of the mags.

Major points were;

1) Dont go larger than 2.0 intake valve. Larger may compromise the casting and crack (suprize!) the seat. Exhaust use the 1.625.

2) Major limiting factors are the springs length,diameter and valve length. Using a longer valve (.450 )means a taller spring without machining too deep in the seat. These are 5/16 stem so ream the guides. Now you can use all kinds of retainers/locks. And run a much larger cam!

3) Modify/notch the chamber wall enough to get near stock volume once a 2.0 intake is in. You should end up at slightly more than 61 cc.

Massage the entire port from bowls to gasket surface.Spend most of your time from the seats to just past the guides.

The mag has 2 major advantages. One is the combustion chamber design. The other is flow balance and velocity. Tico got a best of 234 int/185 ex for a balance of 79%! Best an x ever got was about 64-68%. Thats not good if you cant get the burnt stuff out. Another side bonus is compression goes up quite a bit when swapping on an la. Plus better ports without porting.

So the mags are not about big flow #s. They can flow around 260 with lots of work and big valves,but the seats get thin and will crack.
 
BJR Racing said:
Comp Cams has the good conical springs.
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I'm doing the Magnum head swap, and have been trying to find springs. Do you happen to know the part # of the springs that will work in Magnum heads? I looked all over the Comp Cams website and Summit, but can't find them. Cam will effectively (due to the 1.6 rocker ratio) have .507/.527 lift. Lunati 60402.

Thanks,
Dave

P.S. Lots of great info in this thread!
 
Call Hughes Engines about springs. They have some that will work.
 
64physhy said:
I'm doing the Magnum head swap, and have been trying to find springs. Do you happen to know the part # of the springs that will work in Magnum heads? I looked all over the Comp Cams website and Summit, but can't find them. Cam will effectively (due to the 1.6 rocker ratio) have .507/.527 lift. Lunati 60402.

Thanks,
Dave

P.S. Lots of great info in this thread!
Click to expand...

Dave they don't have them listed so you have to match them up by size, installed height, etc. I found a set on Summit a while back but I don't remember what part # they were. I just matched them up by size. Or do what Adam suggested and call Hughes engines. They have their own line (probably made by Comp) and they will tell you what fits right off.
 
64,
I would use either one of these from comp. a 26120 has a 1.445 diam. and 155 closed and 377 open pressures or the 26995 which is 1.415 diam. and has 137 closed and 305 open pressures.
 
Mopar performance has a set of springs and retainers to use(note these are not behive springs like the factory. if you are doing this on a budget, the retainers MP sells are from a 2.2 litre engine, so you can raid the junkyard.

I bought a set of beehives from hughes and I believe they are just the comp cams blue striped beehives. Hughes has the proper retainers to work with these, but there are two issues. The spring seats need to be cut deeper and the retainer sits higher than the exhaust valve stem tip. This can cause interference issues depending on the rockers used.

The easiest swap is the MP springs and 2.2 litre retainers
 
I have the '6062 springs from MP, Does anyone know for sure if 2.2 retainers will work for me ??? once I get heads that aren't cracked. Please I need help lol, I'm losing it
 
Sorry, I thought it was clear in my post that the 2.2L retainers will work with the MP valve springs.

Just so you know where I am coming from. I have personally gone to the wrecking and removed vavle spring retainers from 2.2L engines and installed them on magnum heads with the MP valvesprings and ran them in my race car(and won a number of races too!). So will they work? absolutely.


Here is a description of the valve retainer :

P4452032-Chrome Moly Valve Spring Retainer (2.2L/2.5L SOHC, Truck Magnum/Jeep® Engines)
 
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