Originally Posted by tc5 man

wow thats a steal man whats the diffrence though in the limited .21bf and the n21r though are they good modders good reviews

Originally Posted by PowerHouse

This is the N21BF Limited with a new head. It has the 14mm crank, 25.4mm rear bearing and the newer case like the N21BF. The internal layout and timing specs remain the same. I still have a bunch available. Thanks

Originally Posted by PowerHouse

By increasing the diameter of the crank, it allowed the ability to advance the crank intake timing without sacraficing the stength of the shaft. The new 14mm crank with the same factory depth cut gave the crank a 10 degree advancement in induction timing as well so the engine does run better with the new crank. My race ported version runs side by side with my race ported P5 and Plus21-4 and I have those available for $175 for a limited time offer. I also still have the stock ones available for $135.