but building a h23 block would really be a waste, because you would be spending a lot of money to make it do what a stock h22a will do... if you replaced all the bearings with race bearings, it would be better, but the cost of tearing down the engine and prett ymuch rebuilding the bottom end would be pretty pricey. most of the gaskets would need replacing if you take it apart. If you want to auto-x the car a lot, leave it non-vtec.... look at toda's VTEC killer system... it eliminates the vtec on B series VTEC engines to prevent any oil pressure drop due to vtec engagement and also maks for a smoother powerband up high, with a slight loss of torque on the bottom end...