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puzzled

Old 10-20-2018, 09:43 PM
  #1  
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Join Date: Jan 2014
Location: detroit
Posts: 49
Car: 84 z
Engine: 350
Transmission: 700
Axle/Gears: auto overdrive
puzzled

2000 miles on a new 290 h.p. crate motor with new distributer/ wires/ plugs/ shorty headers/ taller intake/ Rochester carb with 3x14"/: filter /battery/ starter/ temp and oil pressure sensors and ( yes I trust the gauges) flushed and tested 2 row aluminum radiator with Evans coolant/ and a190 degree thermostat. she ran very hot until I got the air out of the block...but...now that it's cooled down here in Detroit it won't climb past 140 even with half the radiator covered over. coming of the highway we climb back to 185 for a while but driving around town it's back down to 140. owned this car for 23 years and sometimes think fondly of that normal and easy going 305. thanks guys for any ideas. spenc

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Old 10-20-2018, 09:50 PM
  #2  
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Join Date: Mar 2017
Location: Portland, OR
Posts: 1,718
Car: 86 Imponte Ruiner 450 GT
Engine: Various
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: puzzled

If it's a fail safe thermostat it may stick open when overheated. You may have to replace it.

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Old 10-20-2018, 10:54 PM
  #3  
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Join Date: Mar 2002
Location: Ontario, California
Posts: 867
Car: 1992 Z28
Engine: 383
Transmission: 700R4
Re: puzzled

You not running any water with the evans coolant correct?
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Old 10-22-2018, 11:55 AM
  #4  
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Join Date: Oct 2013
Location: Louisville, KY
Posts: 2,074
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: Built TH350, 2200 stall
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: puzzled

What temp thermostat do you have in it and what brand? Like tealman said, failsafes will stick open if they get too hot.
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Old 10-22-2018, 01:27 PM
  #5  
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Join Date: Aug 2009
Location: Los Angeles
Posts: 1,105
Car: 1989 IROC Convertible
Engine: 305 TPI (F)
Transmission: 700R
Axle/Gears: 3.42
Re: puzzled

I'd start with the thermostat. Cheap and easy and could very well be stuck open.
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