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LS short box · 05-07-2023, 09:18 PM

The stat on the left is for a LS1. The little notches near the rubber gaskets clip into the stock LS1 aluminum stat housing.
The stat on the right is for a LS3 ish engine. It does not clip into the thermostat housing.
The LS1 and the LS3 thermostat do not interchange. The LS3 thermostat is slightly larger in diameter compared to the LS1.
It really depends on your water pump. Is it a 2002 Camaro or a later model Camaro?

05-07-2023, 09:18 PM	#2
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,953	Re: LS3 Thermostat issues The stat on the left is for a LS1. The little notches near the rubber gaskets clip into the stock LS1 aluminum stat housing. The stat on the right is for a LS3 ish engine. It does not clip into the thermostat housing. The LS1 and the LS3 thermostat do not interchange. The LS3 thermostat is slightly larger in diameter compared to the LS1. It really depends on your water pump. Is it a 2002 Camaro or a later model Camaro?