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IIRC stock mag heads dont take much lift over the .450/.465 lift mark

best measure clearance on the valve guide/retainer/seal to make sure you have enuff clearance for that lift range




He's Right, make sure thats addressed before you use either cam. Theres spring seat depth issues too, not being deep enough before coil bind for .450 lift and above.

Im going to guess that by now, 2010/2011, someone has already fixed these issues on your Magnum heads. Better check to be sure if you dont know for sure. mike