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Old 07-27-2017, 10:49 PM
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Did I drill my LT-1 160 degree thermo too much?

A month or so ago I applied MC96-001 Service Bulletin (reroute steam tubes) and changed Both thermostats on my 1996 ProStar 2015 LT-1. I bought a 160 degree Mr. Gasket High Performance Thermostat #4363 and drilled it myself (two 3/16" holes). I'm now running about 130 at idle and at speed. Is this too cool? Did I over drill my holes?
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Old 07-27-2017, 11:40 PM
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check engine temp with a laser reader - 20 bucks at harbor freight... but maybe...
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Old 07-28-2017, 12:07 PM
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Originally Posted by mikeg205 View Post
check engine temp with a laser reader - 20 bucks at harbor freight... but maybe...
I've got a laser reader at home. Where should I point it? Heads? Block?

Thanks,

Val
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Old 07-28-2017, 03:03 PM
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Where should I point it? Heads? Block?
Ah, thought about it a bit. I'll point it at the head by the temperature sensor!
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Old 07-28-2017, 11:47 PM
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got it - and at the coolant temp sender for gauge
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Old 09-06-2017, 01:43 PM
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A few weeks back, after a long day of hard running on Lake Shasta, I took some temp readings while at idle.

Dash gauge - 130
Front right head at sensor - 130 (is this the ECM?)
Front Left head - 153
Right rear by plugs - 160

I wasn't smart enough to measure at temp gauge sensor point.

It looked to me like I was running slightly cool so bought another thermostat. When I pulled the old thermostat, which is only about a month old, I found it was heat stressed with cracks and discoloration! Now I'm wondering how this happened since the engine has been running cool and steady since I applied MC96-001 service bulletin when I changed the thermostats. When I drilled the now-cracked thermostat, I drilled the holes low on the cone (see pic). On the new thermostat I drilled the holes high. After a driveway test run with the new thermostat, the temp is steady around 130. I'll be taking the boat to Tahoe for a week soon and then I'll get feel for how the temp is under load.

I would appreciate any thoughts on why my month old thermostat got so hot it discolored and cracked. Kinda worried about this.
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