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robmccolery 02-03-2007 02:57 PM

1983 ford inline 300
this bronco is from out of cal, this is the third motor, it is running lean and burning valve! i said to run cooler plug and change out the cat on back.
what do u all think

swvalcon 02-03-2007 03:00 PM

I'd say you have a timing problem or plugged cat causing exhaust to run hot.

RPM 02-03-2007 07:19 PM

those things are real bad about the intake warping and causing a vac leak.

robmccolery 02-03-2007 08:21 PM

that happened has been fix, new carb ,new intake,

IanRiordan 02-04-2007 05:36 AM

I don't have any experience with 300s but out here the 250s burn intake valves (!) before exhausts. Some blokes drill and tap the heads for a top water outlet and claim it helps valve life.
I've done a few 302/351w F150s from the early 90s that blocked cats after a head gasket failure - coolant always kills cats. They all burnt out #8 exhaust valve,and the customers complained of a hot l/h floor.

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