Originally Posted by jeff79

Hello all.... I have purchased a new gm performance 250hp 350 and am now having some problems with the install.... We managed to run the engine for 30 minutes to break in the cam but it ran up to 220 on the temp and it will do so every time I run it for any longer 30 minutes or so.... It seams that it doesn't heat up as fast if it is just running without a load, but does heat up.... I have had the 3 row Radiator rodded out, put in two different Mr. gasket high flow 180 deg thermostats, replaced the water pump, heater core has been flushed and added a fan shroud to the flex fan.... It seams that it takes a little longer to heat up then it did before but it still gets right up 210 within 35-40 minutes....

This engine has all new parts top to bottom
Edelbrock performer intake (non EGR)
Edelbrock 600 CFM performer carb
MSD Street Fire Hei dizzy
Summit racing plug wires
acdelco plugs gapped 35
Summit mechanical fuel pump 6.5psi line pressure

any ideas would be helpful as I have ran out....