Jeff, the '98. 5 through '01. 5 valve covers are made of cast aluminum which can be polished (as Steve did) or chrome plated (by a good chrome plater... heavy emphasis on good). Aluminum is more difficult to plate correctly... usually only a custom plating shop will provide adequate results. As in most finishing processes, the outcome is dictated by the quality level of the prep. work. In chrome plating, that would be the polishing before and between the triple plating steps (copper/nickel/chrome)... especially the copper plating step.
Mike, I don't think the newer valve covers ('00 and newer) are made of magnesium. When I replaced my '98. 5 valve cover with a '00 valve cover I noticed a major weight disparity between the two... the '00 valve cover weighs 3 3/8 pounds less. . or roughly, one half to two thirds of the '98. 5 counterpart! After careful scrutinization between the two (including wall thickness measurements), I noticed Cummins made the newer style (i. e. , black) valve cover "cheaper" (i. e. , thinner wall thicknesses). It could have a slight "mag. " content in the aluminum alloy however, it is not pure magnesium. . or close. Needless to say when I take one of my two covers in to be chrome plated it will be the '98. 5 cover. I'm also going to have my Banks High-Ram intake manifold chrome plated at the same time.
#ad
#ad
groundpounder, it's a labor of love... right Steve? I've been there many times before. If you don't clear coat the polished surface you will experience that "labor of love" on almost a bi-weekly basis..... when you're cleaning/polishing it.
#ad
#ad
Also, here again, as in plating, a quality application of the clear coat is essential... the clear coat does NOT like to adhere to the polished surface. Clear powder coating should provide superior adhesion and durability however it may not appear as clear as other clear coat processes. Flip a coin... and live with it.
#ad
------------------
John Treibel
'98. 5 2500 QC 4x4 Sport, Glasstite Vision II, 285 BFG A/Ts on M/T Challengers, Warn 4X Boards, Mopar fender flares & tow hooks, NW Custom s/s-rubber mud flaps, Mag-Hytec diff. cover & trans. pan, Edelbrock IAS shocks, Reese Titan V hitch, VDO Vision gauges, Dynamat, '00 Sport grille and headlights/PIAA Super White bulbs, PIAA Dual Sport 900 aux. lights, BD exh. brake and TorqLoc, Amsoil Dual Remote Bypass, Optima Yellow Tops, DD3s/DD Boost Module, Aeroquip AQP braided s/s fuel hoses, Banks High-Ram intake manifold and 14 cm2 turbine housing w/Big Head wastegate actuator, ATS 3-piece exh. man. , Banks 4" dia. s/s exh. sys. , BD V10/Cummins hybrid TC & mod. trans. frt. pump, BD VB & PressureLoc, Air Bulldog induction hood (with NACA ducts), plus MANY other trick modifications
Recycle Bin: Prime-Loc fuel filter relocation kit (JUNK!), Bosch 275s & VA CPC (upgraded to DD3s... WOW! what a difference!), '00 Dodge/Cummins valve cover (changed my mind... stay tuned)