Request to Classify K20A
#27816 from Jacob Clark · No action required · Minutes (2020-03 Fastrack)
Thank you for your letter. The JDM and Euro K20s are STL legal with the use of the USDM intake
manifold, 11.0:1 compression and 0.425 valve lift or the USDM OEM cam shaft. Aftermarket pistons are
allowed in STL to achieve the 11.0:1 compression ratio.