The SRP's are a good quality shelf stock piston. Are they top of the line? No. Will they work for an intended application? Yes, if they fit the bill. I would always prefer to use a shelf stock piston if possible just because of the $ savings, I'm not looking for every last .10 of a horsepower. Unfortunately I can't use a shelf stock piston as the valve reliefs can't be made deep enough without hitting the upper ring land. But if they'll work for you and you aren't talking about an all effort engine I wouldn't hesitate to use them.