Think You Have a Blown Head Gasket? Watch This Block Test Ever wondered what a block test actually looks like and how mechanics use it to check for a blown head gasket? Block Tester: https://amzn.to/493b1dH In this video, I walk you through a real block test on a 2017 Toyota 4Runner that came in with a misfire on two side-by-side cylinders. That setup is suspicious, especially on Toyota’s 4.0 V6, which is known to overheat and blow head gaskets if coolant runs low. Before guessing or throwing pa
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