Which piston should I use

I have a 86 b2000 FE that I'm looking to rebuild and I'm doing the works to the engine so that way it not only performs better but lasts a good ling while. Now I have a choice between diamond racing pistons or wiseco pistons that will match my .40 over bore. Has anyone heard good or bad thing about either one or any recommendations? If so help is much appreciated guys and girls!

It won't make much difference. A .040 overbore isn't going to give you a noticeable increase in performance.

He's asking about piston brand. Not performance vs bore size. His is machined .040 over now. I've had great luck with Wiesco pistons over the years in all sorts of engines.

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