Today my express started to misfire on multiple cylinders primarily #6 and # 8 so I checked the compression and had 0psi of compression in cylinder 6. My engine only has 210000 miles. Are these engines that ****ty I thought the last was suppose to be very reliable. My question is are the valves know to prematurely fail ?

 

I would never buy a 3/4t van with a 4.8L engine.

 

why not give some details as to why might help out someone here? Thanks

 

possible camshaft problem also. what were the compression numbers on the other cylinders?

the next possible steps imo would be:
-leak down test to determine where the loss is from,,,,intake, exhaust, headgasket, rings
-vacuum gauge to see if its a valve problem
-remove valve cover....crank it over and watch for rocker arm movement

 

I decided to buy a whole lower mileage engine and go from there

 

put a 6 liter in it