carbed LS1 in a 1962 Impala
07-11-2014, 02:29 PM
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carbed LS1 in a 1962 Impala I have a 5.3 (carbed) in a 62. ? is about cooling or more precise, what is the preferred way to handle the steam ports on the end of head. I was told to tie them together, drill and tap the water pump just below where the nipple comes off to the upper radiator hose and connect them to that new port. My ? is concerning water temp. @ extended highway speed. Around town in 90 degree temp. it will stay @ 170 degree. Once I hit the interstate and try to run 70 MPH @ 3000 RPM, it will eventully climb to 195. I know that is not too hot but it also means it is border line. I am running the stock radiator (originally a 283) so before I buy an aluminum radiator I would like to know if I have the steam ports right. Thanks--Lee Thompson
07-11-2014, 03:33 PM
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Sounds fine! My 2008 silverado runs 210 degrees all the time. Has since new. Many have drilled and tapped the water pump as you have described. If you would like for it to run cooler try a 160 degree thermostat.
07-11-2014, 04:44 PM
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Thanks I have a new 160 stat--new Autometer temp. gage. One or both is off 10 degrees as it runs 170 all the time around town even in 90 degree temp. It is that it will climb to 195 on the open road. I need to know if the the new port in the water pump could be the cause. I need an answer from someone who is running a carb with the same port. Thanks---Lee
07-12-2014, 10:09 PM
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I have the port on my 55 chevy sedan with a 6.0 and my 69 chevy C10 truck with 5.3. Port caused no issues on either project. Will drill pump on my 62 biscayne wagon 5.3 swap I'm currently working on. All 3 are carb setups. Hope that helps!!
07-13-2014, 10:12 AM
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My LS1 in my 1935 Ford has always run at 210 degrees...exactly where I want it. The engine is much more efficient at 200-210 degrees as GM engineering intended. I can't figure out what the benefit would be running this type of engine at cold (160-170) temperatures.
07-13-2014, 06:35 PM
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Sure have!!! The 69 C10 took a 40 miles one way trip last Saturday to a cruise in. For at least 30 of the miles speed limit is 70 mph and the truck was not under that.