[RKDinOKC]

Those 600 hp setups are only about $35,000 and typically take a year for the guy to build them up. It's pretty amazing they can get 600 hp with normal aspiration. A lot of work on the heads, cams, exhaust, and intake. The guy that does it was recommending I put $11,000 in hydraulic lifters instead of stock when I rebuilt my motor just because I put in a different cam. I didn't think it needed anything except the cam. The cams I put in were from the 5 liter 928 GT. The GT cams have more lift and duration that the 5.4 liter 928 GTS cams, but both have the same heads, valves, springs, and lifters.