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What size is the cooling fan?Part #52086About the same size as a soda can.Where should the cooling fan be mounted?It should be mounted on a solid surface and be pointed at the head andcylinder wall. Vibration will cause the fan to fail or fall apart, we strongly suggest mounting them on rubber grommets.

When installing these coils, the two brass 10-32 threaded inserts are where the 12 volt power and the trigger wire (points or module) wire goes.  They can be hooked up either direction.  Link to coils Click Here for Video  

How big can you bore a stock block. 10-12 Block biggest you can bore is 50 over on old style which is 3.420.The newer style blocks can go 3.530 for 14HP Largest valve for 10HP Intake1.850 Exhaust 1.50. Measure cylinder wall by using calipers between finsand inside diameter of cylinder.16 HP stock can be bored 30 over 3.780 to 3.937. Head strap is needed!18HP Blocks K361 can be bored to 3-15/16 must have head supports.  Link to pistons Click here to video