Is there enough room using a MW piston sp46 with a WD45 crank in a WD block I know it will be high compression motor ,it will only be a pulling tractor for dead weight
 
Nope. Machine off .150" to .170" off the top rim of the piston to clear the cylinder head. Use 110 octane or better gas. Colder spark plugs. Set ignition timing to probably 20 to 22 degrees BTDC at wide open throttle.
 

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