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ZLRob · 02-20-2026, 02:41 AM

If you have a P0128 then replace the thermostat, as they have been known to cause issues on the early gen Z's. I replaced mine shortly after I did my engine build with a DMS housing and a 186* Corvette LS3 thermostat and have never had a problem with temperature regulation ever since. This may be a great time for you to do the same. As it gets rid of the new gen style small stat that is being used on the LT engines and you'll give your housing a better protection from the belt taking it out if it ever comes to slip off or snap off the pulleys.

02-20-2026, 02:41 AM	#7
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 982	If you have a P0128 then replace the thermostat, as they have been known to cause issues on the early gen Z's. I replaced mine shortly after I did my engine build with a DMS housing and a 186* Corvette LS3 thermostat and have never had a problem with temperature regulation ever since. This may be a great time for you to do the same. As it gets rid of the new gen style small stat that is being used on the LT engines and you'll give your housing a better protection from the belt taking it out if it ever comes to slip off or snap off the pulleys. __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 758 HP/ 804 TQ