RE: An HPI truck .28 engine with 2.9hp or OS .32 marine engine with 1.1hp for 36' fiberglass hull?
If you can find a water cooling button for the.28 or make a scoop so your motor gets plenty of air to cool it.I would go with the.28,Mopar!!!!!!!! and rpms. If your trying to find what your crank thread size is 1/4 by 28 thread count on the big blocks!