Head Gasket,Cracked head or hole in piston

After pondering the compression numbers and 1 + 1 = 3 I decided to run a compression test again.

The results
Looking in from the front
Right Bank
1/ 150
2/ 160
3/ 150
4/ 150

Left Bank
1/ 165
2/ 160
3/ 145
4/ 50 (Damn)

So for a number to be this low (50psi) the thoughts would a hole in the piston or rings what ever though, a tear down will be required:pale:

Not a good Christmas pressie

Benton