overheating
#3
Also tell us about the radiator size and age (i.e. is it clogged? ). And is it getting sufficient airflow? And how about the fan clutch (if equipped)? Assuming that the above is OK, and ign timing and fuel/air mix are good, then suspect a bad head gasket.
#4
I'd start with this. If you are running the 455 with the original two-row radiator from the 330, that's your problem.
#5
more info
The original engine was the high compression 330. The 455, I don't know what it was originally in. Radiator is factory 2 row. New 16 lb cap, new pump, new 180 deg stat. The car didn't have an actual shroud when I got it. The header plate extends out over the fan. Overheats after about an hour at idle or 7 or 8 miles. Stays right about 180 forever then jumps VERY rapidly to 230. Gauge is one of Sun Pro's better models. Car is just a small bit rich with just a very slightly low advance. Carb is 750 quadrajet off 330. Can has a touch more duration than stock, but not radical. Valves are OEM. Compression as 9:1. Thanks for any ideas. Y'all have been a lot of help ever since I got the car.
#6
#8
more info
I "burped" the system again and is doing better right now. I can see the thermostat opening and closing on the guage. It is really pretty close to its' rating. The radiator is original equipment, not new. It looks good inside where I can see, but I am going to go ahead and order a new one today. I am, also, changing the reservoir to make it a closed system today. I adjusted the timing and carb yesterday. I love the 330, but I have to admit that the 455 has much more torque. Does anyone know where I can find an OEM shroud? I can mold one, but like OE if I can get it.
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labrats804
Small Blocks
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July 19th, 2007 07:16 AM