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Assuming your has been running without an overheating problem I don't think that requires an overhaul just based the jacket.


Kevin -

Within the last couple of weeks, someone told that they were running higher than 87 octane to keep spark knock at bay...... if that was Larry, I can see why.

The 3.0L blocks that I have seen look that bad around the cooling passages have been very gunked up lower in the jackets.... particularly toward the outboard areas of the jackets, where sediment is more prone to accumulate.

Frank


A hot spot will cause preignition but is unlikely to be the cause of detonation. Typically preignition is not easily controlled by changing the octane of the fuel.

I don't see anything suggesting a sever detonation issue. I did notice that the initial timing on the motor has been changed a few times.

Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...