418HP 5.9 Magnum

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Brian Hafliger

Brian Hafliger

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Using our iron heads, 9.4:1, custom hyd. roller cam (around 210 @ .050) and our house 750 carb / TTI step headers is made 418HP and 437TQ.
It idles at 800rpm, very smooth with just a hint of a note...we also used Harland Sharp 1.7 rockers on it that are not adjustable...

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Nice! Efficient! Mild cam! Good numbers! Well done.
 
How much hp did it make with the water pump not working 15? but still good numbers.
 
Nice! May I ask what valve lift is? I'm waiting for my head gaskets to show up so I can bolt your heads on my 340. The set you sent me look great.
 
Hey Brian, that’s pretty cool engine. Can you tell me about the heads? Valve size, any port work?
 
Very nice numbers! If I may ask, what piston, head gasket, and chamber size? Trying to get one of these to exactly 9 to 1. Wonder what the professionals do. Thanks for your time!
 
408 swinger said:
Very nice numbers! If I may ask, what piston, head gasket, and chamber size? Trying to get one of these to exactly 9 to 1. Wonder what the professionals do. Thanks for your time!
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KB 362 piston, 19.4cc, out of the hole .005, Victor head gasket .045, cut head down to 61cc for 9.4:1.
 
Very good information, sir! Thankyou!!
 
poking them out .005 yehaa, that's old school!!!
 
Ooooo, and a 4 Speed OD behind it?
Ahhhhhhh, now that sounds nice!
 
RAMM said:
Nice engine Brian-that will play nicely with the injection for sure. J.Rob
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Sure surprised that cam produced that power! Especially with the lobe families I used...very smoooooooooth!
 
ou812 said:
Sure surprised that cam produced that power! Especially with the lobe families I used...very smoooooooooth!
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I'm not. Been saying it for quite sometime, the cam is not the determining factor in power production. J.Rob
 
RAMM said:
I'm not. Been saying it for quite sometime, the cam is not the determining factor in power production. J.Rob
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Thanks you!

I bang my head in the walls and tables trying to tell some people that. But nooooo, the cam is where all the balls are at!

OMG! They win! Whatever! Have fun....
GOD save me....
 
RAMM said:
I'm not. Been saying it for quite sometime, the cam is not the determining factor in power production. J.Rob
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Too much of a blanket statement there...I know what your saying, however the more I lean on the low lift flow and cam for it, the better our engines run.
 
I feel like that .576" lift has something to do with the power production... even though it's a Magnum and putting in a flat-tappet cam is a step backwards what do you think the power would be with similar duration running an FT cam, since max lift would be less?

My understanding of cams vs. power is they just move the torque curve around, which in turn changes HP, to an extent. The total "power put to the ground" over the time the engine pushes the car through the rev range (area under the curve) doesn't change much. But lift affects total power, right? I don't really see guys building 400+ HP engines with .430" lift cams, if the head port can flow well above that...
 
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