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My name is Jose Dela Cruz and I recently purchased a 1969 cavalier 17ft ski boat hull number 85. I am wanting to put a throttle body injection system on it and was wondering about the log manifolds.. I’m wanting to run an oxygen sensor in between the riser and log in a spacer plate. I know the Q log preheats the water from the circulation pump runs it through the log, into the riser then into the block. I was wondering what the differences are between the F log manifold and the Q log manifold. In the F log the water goes through the log and out the log meaning there’s no water in between the riser and log which would bis ideal for the oxygen sensor.. is the only difference the “end cap” (sorry I’m not sure what it’s called) where the water enters the log?