The Cart Before the Horse: Spec 3 Build

[ScottyB]

The abrasive runs into crevices and into oil and can cause significant wear in the motor.

i can't even count the number of times i've read about driveway-fixit subaru guys trying to rebuild their blown-HG junkyard engines by scouring the deck/heads with scotchbrite to clean off the old HG and then acting surprised the engine is slapping/smoking a couple hundred miles later.