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Old 04-27-2019, 02:50 PM
sjdiesel's Avatar
sjdiesel sjdiesel is offline
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Join Date: Jun 2013
Location: Thousand Oaks, CA
Posts: 183
Default 1967 GTO cooling questions

Finally got my car back on the road and have some questions about how the car is cooling. As summer is approaching, I have concerns I will not be able to keep the car cool on the hot days.

Car runs about 170ish around town and about 185ish on the highway when it is about 60-65 degrees out. Highway speeds are 60-65mph / 2400-2700 RPM’s. Just last week I was driving the car home from work and it was 90 degrees out and on the side streets, the car stayed about 185ish and jumped to 205-210 on the highway. Seems like engine speed is playing a big part in cooling. I also notice the temp creeps up on some of the larger hills.

Cooling system specs:
  • Iron heads and iron intake
  • Cold case radiator
  • Dual Derale fans 16825
  • 7.5” crank pulley
  • 8” waterpump pulley
  • Flowkooler 8 bolt hi volume cast water pump w/ billet aluminum impeller
  • New timing cover from Butler
  • 50/50 o’reillys coolant/distilled H2O
  • 160 t-stat

So What do you guys think? Are these normal temps? Is the pump turning too fast on the highway?

__________________
Sean
1967 GTO
Koerner built 468 with Edelbrock RP’s 315cfm by Butler, Luanti Voodoo HR 20510713, 4l80e, Holley Terminator EFI