stock rocker arm question

I did a bit of searching, but I couldnt find out what I needed to know.. I'm sure it's been mentioned, I just cant find it... I used to know, but it's been a while..

Whats the biggest cam I can run in a roller motor without needing adjustable valvetrain?

I have a set of heads I'm still doing work on, which will be used on my turbo setup. They are setup for adjustable valvetrain. I didnt want to do it now since the car has been under the knife for a few yrs with many changes ( aftermarket EFI and all that ). Wanted to get things sorted out before I complicate things by running twins...

So since I'm going to run basicly stock heads ( mild porting and larger valves ), and I'm going to race the car this yr I figured I'd drop a cam in it.. I just need to know what the biggest cam I can run on stock valvetrain ( swapping springs course, but everything else stock ).. I just dont want to run a stock cam..
 
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