USING BASIC TOOLS TO CHECK THE FLATNESS OF A BLOCK DURING AN ENGINE REBUILD 

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Speaking for old geezer Tool & Die men everywhere, shining a light through the crack between the straight edge and the block will quickly reveal any warp.

Blueing it works better and you can literally see it

How do you attract so many qwerty qweers to your channel? Haha, every drunk uncle is a fucking pro!

What a hack. If you have a big gap just fill it in with ultra black silicone... Not the grey. Grey isn't strong enough... Obviously this is sarcasm. Please people. Don't use silicone