8.1 Vortec Compression Test & Spark plug Change W24 Workhorse Chassis

Per factory repair manual this is how to perform a proper compression test and spark plug replacement.
Plugs I used ACDelco 41-101 Professional Iridium Spark Plug https://amzn.to/3JkfVpK
Best Spark Plug wires for our 8.1 Vortec
https://www.ultrarvproducts.com/SPW81...
Update about spark plug gap
We’ve done a lot of dyno testing and with our "Magnum wires", there was absolutely no difference in power between .045 gapped plugs and factory .060 gapped plugs. Removing the resistance in the ignition wire has many benefits! Back when we use to run Taylor wires, the .045 gap worked well but with the Iridium tips being a bit more fragile I recommend leaving them alone at .060.
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Jon Brazel
Ultra RV Products / Brazel's RV Performance