I installed ARP studs in my 2.3-16. The ARP head studs for a Ford Pinto 2300cc (part number 151-4202) are perfect for a 16 valve. The "Ford price" was $95 while the Mercedes price on another web site was $190. Go figure. I believe that these are the correct studs for most older Mercedes engines. This "kit" came with 10 studs, you will need 14 studs for a six cylinder engine.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"