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If you remove the Q intake from the Q motor and replace it with an automotive aftermarket, of course the distributor must stay at the same location but the thermostat is moved to the downhill location where it can't automatically collect an air bubble. An air bubble would (in theory) cause that part of the motor to overheat.
There is a concern that because of the engine tilt in a boat while stationary, including even more tilt when running, that there could be an air pocket somewhere in the high side of the motor (block and/or heads) that would cause that location to overheat.
This may be noodling about something in theory that just does not happen in practice.
Most boats I've seen have the t-stat at the high end of the motor and this seems to assure that problem never happens.
Therefore there has been some ideas about tapping the block or the heads (or the intake at the water connection to the heads), at the highest part of the motor, that would seem to solve the fear of ever having an air pocket that would cause overheating.