I got 89 Iroc and I took the thermostat out. Which one do you guys reccomend?

 

STOCK!!!!!

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Scott Downs
85 Trans Am
305 tpi/700r4
3.73 w/255/60R15
plain firebird nose(for better engine cooling)
T-Tops, pwr everything
been to about 140mph

 

170 degree seems to work well, just make sure you replace the time at which the cooling fans turn on or run a switch so you can manually turn it on.




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1987 Firebird Formula
305 LG-4
Crane CompuCam 2030
700-R4 Trans
4 barrel quadrajunk remained by holley (this carb stinks!!!)
edelbrock performer intake
Hypertech Thermomaster Chip
Open Element Air Filter
No Cat with Straight pipe (Dynomax muffler rusted apart and fell off probably could not stand the heat )
Accel H/P Coil

- Soon to be installed
Holly Spreadbore 600
Edelbrock TES
True Dual exhaust or 4 inch single pipe to dual 2 1/4"
1.6:1 Ratio Rockers
Set of New Valve Springs

 

MAD,

You might be able to use a 170°F in Vegas without problems, but almost everywhere else I would suggest a 180°F with a stock PROM in an EFI engine.

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Later,
Vader
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"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

 

You know you can try a 170 degree where you live, if you upgrade your water pump to a high flow like I did, I run a 160 in summer. (I don't drive it in winter) Mine is cool in the summer for HOURS of cruising fun.