How hot can aluminum heads get before they warp?

Stang_ROTY · 08-04-2001, 09:35 PM

Well, we a pressure test on the cooling system with the engine off and she held 19 lbs. of pressure for over a minute. Only leak was at the therostat housing neck but with a couple turns of the screw driver it was air tight. So we decided to run the engine with the pressure tester still attached and we could feel the thermostat open and the cooling gauge stayed at 195ish the entire time she was running. My engine builder kept revving her and no leaks or drop in pressure ONCE!! No blown gaskets! That makes me feel much better. My only problem that is stopping me from going driving is a fuel leak on the drivers side middle of the freakin fuel rail. Those damn 90 degree AN fitting keep leaking on the retun to the regulator side of the fuel system. That's the driver's side fuel rail so I now have to remove the upper intake...... again. My engine builder also convinced me that the Black Majic 5.0 fan is a little too small for a 351 with no radiator shroud. The black majic is only 15 inches while the original fan on my block was a 18 incher. I think a larger electric or even mechanical fan will help. What do you all think?

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08-04-2001, 09:35 PM	#1
Stang_ROTY Registered Member Join Date: Feb 2001 Location: Berkshire County - Massachusetts Posts: 735	Well, we a pressure test on the cooling system with the engine off and she held 19 lbs. of pressure for over a minute. Only leak was at the therostat housing neck but with a couple turns of the screw driver it was air tight. So we decided to run the engine with the pressure tester still attached and we could feel the thermostat open and the cooling gauge stayed at 195ish the entire time she was running. My engine builder kept revving her and no leaks or drop in pressure ONCE!! No blown gaskets! That makes me feel much better. My only problem that is stopping me from going driving is a fuel leak on the drivers side middle of the freakin fuel rail. Those damn 90 degree AN fitting keep leaking on the retun to the regulator side of the fuel system. That's the driver's side fuel rail so I now have to remove the upper intake...... again. My engine builder also convinced me that the Black Majic 5.0 fan is a little too small for a 351 with no radiator shroud. The black majic is only 15 inches while the original fan on my block was a 18 incher. I think a larger electric or even mechanical fan will help. What do you all think?