How to use plastigauge for measuring head clearance

[XtremeRcBoats]

I bought some plastigauge to measure the head clearance. Have not used this stuff before. What is the best way to use it, can you do the same as with a tin wire and stick it through the plug opening?

 

[FloridaScaleBoater]

Cannot use the same as with tin wire/solder.
Plastigauge is not bendable.
How I use, remove head and cooling jacket, cut a piece of plastigauge to fit side to side on piston top,
Reassemble head and cooling jacket, tighten to specs, rotate engine over by hand.
Remove head, measure the squashed area of gauge using the colored measuring squares on package.
Adjust with shims to desired clearance.

 

[Daniel's Racing]

You never want to rely on anything that takes compressive force to take measurement.

Especially when building engines in around .010" squish