345 Compression testing

[herculz]

Looking to replace my inline 6 soon, heard that before I buy an engine I should perform a compression test on it, is there a good device that someone would recommend as a sure fire test?

Thanks

 

[Michael Mayben]

Here's a typical "compression test" scenario:

http://www.forums.IHPartsAmerica.com/gas-engine-tech/1984-compression-test-304a.html