[Scarebird]

M22Z may be a better match, or a Doug Nash unit.

[gtospieg]

I agree but I may not keep the 2.56's....also there is a T-10 with 3.42 1st gear...

[Scarebird]

If it holds up that would be a good call.

[Scarebird]

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.

[Scott65]

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

[Scarebird]

I will try that and monitor it closely.

[gtospieg]

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.

[Scarebird]

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.