Prayoonto Racing Grassroots short blocks are popular among daily driver to weekend racers of all kinds of motorsports. With top top notch machine work and assembly procedures you can trust.

Your choice of 86.5-88mm bore
Supertech, Wiseco or Arias pistons (will discuss with customer after purchase)
Brian Crower arp2000 or 625+ rods
Precision CNC bore/resurface
Torque plate hone
Crank checked for straightness, balance, polished and ultrasonic clean 
ACL or King race bearings
Blueprint assembly with every clearance documented 


Grassroots K20/K24 short block packages