6.5 Precups - Power -OR- Economy?

[Chevrolet4x4s]

I'd suggest using 6.5 TD cups. The gain/risk with N/A cups won't wash.

6.2/6.5 engines have always had rollers.

Well I shouldnt have to pull the heads then.Glad to hear that its a roller cam.

Also which years of 6.5s had the 18 to 1 pistons and is there a casting number on the engine that will tell you if it is the 18 to one engine....Its a late 95 or a 96 engine
Thanks
Shane