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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.


Machined in house & assembled in house by one of the most respected engine builders in the industry. This procedure can be complicated, feel free to call/text/email us if you want to go over things in further detail ! We would love to be a part of your K-Series build.


You are welcome to provide your own name brand pistons & rods but we encourage you to use what is race proven here, and those brands are listed below.

Your choice of 86.5-88mm bore
Your choice of Supertech, Wiseco, CP, JE pistons (or whichever is readily available)
Your choice of BC arp2000/BC 625+/Supertech forged H-Beam/Speed Factory forged H-Beam/Manley TurboTuff forged I-Beam/Wiseco Boostline forged I-Beam depending on HP goals
Precision CNC diamond bore/resurface
Torque plate hone to exact pistons size (if provided)
Crank checked for straightness, balance, polished and ultrasonic clean 
ACL or King race bearing kit
Blueprint assembly sheet with every clearance documented 

Current lead times on new builds = 4-6 weeks.

Grassroots K20/K24 short block packages

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