Motor heating up quickly
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Senior User
Joined: Aug 2007
Posts: 156
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From: Greensburg,PA
Motor heating up quickly
I have posted several questions in this thread and recieved great advice so I hope my luck hold out on this. I just installed a remanufactured 300 from a company called proformance in my 1980 F150 w/T-18 manual. Installed a comp cams 260 cam kit, Offy dp intake, holley 390 carb, a new DSII distributor, coil, etc. If it bolted on I replaced it. I fired it up for the first time today and it ran great. The only thing that sort of concearned me was it heated up FAST. I only ran it for 5 minutes or so just to adjust the idle speed on the carb and it heated up enough to open the thermostat (I know because I have a new after market gauge I was watching) The intake was also very hot. Now I bolted it to the stock exhaust manifold so I expected some heat but man!! I have NOT set timing exactly yet, nor hav I tuned the carb. Is this heating up, both of the motor and intake, normal? Thanks for any help. Now that it is running again, I can finally set up my gallery with some pics!
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Joined: Feb 2004
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From: San Luis Obispo, CA
For the record, all air should be burped out of the coolant and you want to avoid prolonged idling until the cam & lifters get their initial wear-in. These are important things to do for the initial running of any rebuild. I agree with the previous comments, but will add that new rings can create a lot of heat during their initial run-in. This symptom slowly goes away during the first few hundred miles.
Aluminum conducts head much better than cast iron, so the intake manifold will be hotter due to conduction of exhaust heat from the heat riser. This will give you better warm-up in the winter. There may be too much of this effect during warm weather. I plan on running the same intake with EFI exhaust, so I will have the opposite problem (no heat riser) and plan on adding a water-heated heat riser in series with the heater hose so that I can shut of both with a water valve during the summer.
Aluminum conducts head much better than cast iron, so the intake manifold will be hotter due to conduction of exhaust heat from the heat riser. This will give you better warm-up in the winter. There may be too much of this effect during warm weather. I plan on running the same intake with EFI exhaust, so I will have the opposite problem (no heat riser) and plan on adding a water-heated heat riser in series with the heater hose so that I can shut of both with a water valve during the summer.
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Senior User
Joined: Aug 2007
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From: Greensburg,PA
Thanks for the replys. I ran out of time yesterday but am planning on setting the timing today. I was trying not to run it to long because of the break in procedure of not letting it run at the same rpm for too long. I was a little amazed myself at how good it ran too. It was SMOOTH! No misses, backfires, nothing. Thanks for the help.
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