87 GMC Jimmy overheats only on highway.
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87 GMC Jimmy overheats only on highway.
2 years ago i had a rocker arm break and needed to replace lifters,rods and rockers. since then it overheats only on the highway. I've changed the water pump,thermostat,and flushed the block and radiator. Don't know if it matters i run 87 octane gas. Motor..350 TBI with a truck cam for towing/torque. any ideas???
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