We want the real deal VTEC, so the A2 heads are it for us. Honda engineered the additional 400cc into the K24 by both enlarging bore from 86mm to 87mm and stroke from 86mm to 99mm. The increase in ...

4Piston Racing is one of the tuning houses that makes those K-series dreams possible, and they’ve come out with a unique K24-based 400 ... and ported cylinder heads, to make your own extra ...