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Username Post: Overheating        (Topic#340547)
Forum Newbie
Posts: 6

Reg: 07-07-13
11-12-16 05:10 PM - Post#2661217    

I am sure this has been covered before but here it goes. We have an early 70's 350, it was a complete rebuild and dyno tested at 425 hp. Cannot find who rebuilt it do to a death. Our problem is overheating. Builds enough pressure to blow the upper hose off. Temp gauge is new and goes from 180 -240. New water pump, tstat 160, aluminum rad. Heads off and look ok, head gaskets fine.
I see in the middle of the heads is a water port but not one in the block.
Any help would be great


Super Senior Member
Posts: 5322
Loc: paradise
Reg: 09-05-03
11-20-16 01:26 AM - Post#2662342    
    In response to Jasonda

how fast does it get hot? is there flow through the rad? what is the temp differential from inlet and outlet of rad? electric fan? pics?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.

Frequent Contributor
Posts: 1252

Loc: Lake George, NY
Reg: 11-11-15
11-20-16 07:03 AM - Post#2662364    
    In response to bobb

Right rotation water pump?

Ultra Senior Member
Posts: 10980
Reg: 03-25-05
11-20-16 09:08 AM - Post#2662381    
    In response to Jasonda

  • Quote:
Builds enough pressure to blow the upper hose off. Temp gauge is new and goes from 180 -240.

If it's blowing the hose off, the radiator cap is defective or the hose is incorrectly installed. A hose WILL NOT blow off at 16 psi. With the right amount of antifreeze and a good cap, coolent should not boil at 240 degrees.

66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


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