Mating Surface Prep

Scraping the Mating Surface

Many people may be tempted to leave these contaminants, but that is a poor choice that may quickly lead to a leaking or blown gasket. It may also seem easier to use a brush or Scotchbrite pad in a drill, but my experience has shown me that this can easily lead to ruining the mating surface by eating away metal and making it uneven – again leading to gasket failure. Instead, the first step should be to use a cleaning method that won't damage the surface you are working on, followed by a more aggressive method meant to remove hard to remove gunk, and finished with a proper cleaning. In this case a putty knife/gasket scraper will remove the large deposits and chunks of gasket material without harming the block deck. TIP: Stuff cylinders and cover the lifter valley with paper towels to help keep them from getting filled with crud that will have to be removed before assembly can begin.

Prep Procedure Image Gallery | Image 2 of 8