it never did it before i put in the bigger cam. the cam was put in at no advace or retard, just 0. my timing is at 2 1/2 BTDC. the 10:1 is the pistons that my dad ordered when we redid the engine about 8 years ago. the engine does always run hot, cant get it to cool off. i dont have a fan shroud and cant find one for my car but wouldnt think that it would make it run that much hotter when cruising down the highway or running on a cold day.
First off, with a bigger cam, I'm guessing your timing is way off here. It should be more advanced, and YES, you will need 93 octane gas. A fan shroud does more than you think. Without one, the fan is sucking air from everywhere, when it should just be sucking the heat away from the radiator. Just curious, do you have a 22", or 26" radiator?
Mike