Okay, my friend has a 89 Form and it runs at around 215 degrees. I think that is normal considering my car runs VERY smooth but runs around 220. Do these cars run at high temps? I have a 160 and drilled a hole in the thermo to allow anti freeze to access the heads before 160. What do your guyz cars run at? BTW, his is bone stock G92 package 350.

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90 Iroc G92 LB9
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Dual Cats, 3.42 B/W, 5spd, K&N, Homemade Ram Air, TPIS Airfoil, 160 Thermo, Mobil 1 Synthetic Oil, Dexco Anti Freeze
3rd Gen Web Site

 

Yep, my brother-in-law has a medium built 355 in a '82 Z28 and it runs 215+ all the time. He's done flex fans, tried electric fans,etc. Next we'll try the new radiator setup and see if that helps.

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,Hypereutectic pistons,9.8:1 compression,HPC Coated RPM intake, Speed Demon 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, K-Motion springs, Comp Cam 1.6 roller rockers, Lunati adv.292/230@.050 with .512 lift,Crane pushrods,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with B&M 3000 stall, Powertrax NoSlip Locker, 4.11 gears.

 

Both my cars run very normal temps with 180 thermo's and 200/185 hypertech fan switches. On the highway both stay around the 1/4 mark on the guage. GTA only goes up to 220'ish while idling in traffic with the AC on for a long time. The Formula was the 305 until last week and did the same thing... basically as soon as it hit 200, fan came on and cooled it down.
I swapped in the 355 and am using the same stock aluminum radiator and it's running the same temps basically although it heats up quicker I suppose.
I do have factory oil coolers on both.

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'89 Formula - Thunderchicken - 355 Vetteheaded TPI/T-5/3.45 9-bolt/black/t-tops - the fun car!
'90 GTA - The GTA - 5.0 LB9/TH700/3.27 9-bolt/black/t-tops/tan leather - the cruiser.