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Re: C30 7.4 454 running hot
This might sound silly but did you replace the radiator cap? Those do go bad, even if they look perfect. They are cheap enough that you should have a new one on there regardless.
If that's not the problem, sometimes ignition timing can cause an engine to run warmer than necessary. If the timing is too far advanced, heat can build up in the heads and cause things to warm up.
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1975 GMC Sierra Grande K25HD 350-4BBL 4sp LWB
2009 Infiniti G37S Sedan w/Stillen sway bar kit & K&N Typhoon dual snorkel intakes
ASE certified for brakes, electrical diagnostics and heating and A/C & EPA certified in R12 and R134a
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