So I bought the Anderson n-21 cam and I finally put it in. On their website it says "works with oem pistons" and "good for gt40 heads". So I go to do my ptv testing using the clay method. The cam is set up for 1.7 rockers, I have 1.72s which makes the lift come to .518. I know lift is not the only thing to consider when checking ptvc but just wanted to throw it out there. I used my Anderson valve springs and a stock lifter to check the clearance. The intake valve has plenty of clearance but the exhaust doesn't have but about 32 thousandths. My question is if I actually use a solid roller lifter like you're supposed to would this give me more clearance or less clearance on my exhaust valve.