Save that Money you were thinking of using to buy that Engine Head. and want to incur this self-inflicted wound on purpose to 'Follow The White Rabbit' Down inside of a VERY Expensive Bottomless Money Pit. Unless you are a Very Experienced Mechanic with Deep Pockets and Patience. it may dissuade you from attempting this repair: This is my Thread that will edify you on what to do.and NOT do. This visual Inspection would be the NEXT thing to do before you purchase any Parts or Tools or loosen any fasteners until you know what is actually happening down inside of the #3 & #4 Cylinders. either by a Collapsed Valve or from any Stuck Compression Rings Popping the Piston head off like a Bottle Cap from an RC Cola. Using an inexpensive USB 7-9MM Boroscope would reveal whether or not the Piston has been damaged. but it is equally possible that the Piston Head could have been compromised due to Seized Pistons Rings. The '0' Compression MIGHT be caused by a Bent Valve. the Con-Rod(s) can get bent, turn sideways and shatter the engine block right through the cylinder and side walls and essentially. albeit while making an AWFUL lot of Racket.as long as any shattered Piston pieces and or the Connecting Rod did not bend and jam sideways into the Cylinder Wall. It is entirely possible that this engine could keep on running. and describe any prevailing Engine Noises that you may have heard going on. You would help our understanding if you could describe the circumstances leading up to this problem.

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