#121  
Old 01-24-2023, 09:22 PM
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M22Z may be a better match, or a Doug Nash unit.

  #122  
Old 01-25-2023, 07:30 PM
gtospieg gtospieg is offline
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I agree but I may not keep the 2.56's....also there is a T-10 with 3.42 1st gear...

  #123  
Old 01-25-2023, 08:36 PM
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If it holds up that would be a good call.

  #124  
Old 02-01-2023, 11:05 PM
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I have been running the 5.3 in my Lemans for about 2 weeks; yesterday it was getting pretty warm - 89 Celsius.

I think that this was the factory setting; the T-stat is marked 87.* Has anyone run a different (lower) temp and what were the results?

The radiator has a slight leak (a drip every 5 seconds) so is being replaced with an aluminum/plastic unit.

  #125  
Old 02-02-2023, 10:05 AM
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I don't have an engine like yours. However I'd say that's a good temperature for a modern engine with tighter oil clearances and ptw clearance as well. The interesting thing will be to see if that nice air induction system you built is supplying ambient temps, or a reasonably close to it, to the intake. If so I wouldn't change that engine coolant temp setting and you should have the best of both worlds. IMHO

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  #126  
Old 02-02-2023, 10:09 AM
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I will try that and monitor it closely.

  #127  
Old 02-02-2023, 05:36 PM
gtospieg gtospieg is offline
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From what Ive seen in other LS threads...those LS engines are supposed to run at or near 200* F...so it seems like you're right there.

  #128  
Old 02-02-2023, 07:28 PM
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I noted today that my GMC with the same engine ran at 205-210.

I should have taken notice of this earlier. This car has a 4 core radiator that now leaks a bit. Easy enough, take it down to a radiator shop and have it mended - except there are none anymore and the one still around wants a fortune.

I ended up buying an aluminum unit from Summit, about $300.


Last edited by Scarebird; 02-02-2023 at 07:33 PM.
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