That wasn't very coherent on the boost question...what I meant to ask was depending on the level of "safe" boost for longevity, would the Sprinter/Liberty turbo that you guys are using still be the best bet considering I'll be hauling a 4600lb Rover around...I'd rather not have to worry about re-fabricating mounting brackets and such once I get it in the Rover. I'll probably end up opting for a custom header (=length tubes of course) since it's going to be in a foreign vehicle to the motor and I'd rather just build it to fit the Rover...thinking about running a stack out the hood anyway, soo......

I did notice somewhere on this or another forum a mention of higher rate valve springs, which I'm very familiar with from gas engine applications, but it does tend to cause a little more cam wear. How easy it is to find replacement cams for these or will I have to get one custom ground/hardened if the springs to take their toll on the original cam (it's already got 281k miles on it).