Heater Install in 2006 LSV

I'm trying to get a group buy going. Please see the attached link

https://forum.moomba.com/showthread.php?t=13020

Does anyone know off hand if the hole on the thermostat housing is
3/8" or 1/2" ? I got a 2010 lsv. indmar 325 thx

Quote:

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Originally Posted by lsvboombox

Does anyone know off hand if the hole on the thermostat housing is
3/8" or 1/2" ? I got a 2010 lsv. indmar 325 thx

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Pretty sure they are 1/2". If you look at the pics, I see "1/2" on one of the 90 degree brass fittings.

Is there any reason I shouldnt install the "Y" fitting on the return line of the heater. instead of hooking the return line back to the engine block? They say the y fitting helps increase teh circulation at idle.. any input?