Below is our range of small-bore Classic Mini Engines, If you require engines for the ADO16 range please let us know. We absolutely love the small bore A Series, whether it is a standard 998 or Stage 3.We have designed our own Roller rocker sets for use with the small bore cylinder heads available in 1.35:1 and 1.5:1 ratios. The 1098 engine makes a great motor with huge torque. Take a look through the range for full specification and dyno results.