The mark is on the pulley below the water pump. It's a minor scratch in the form of a line. I marked mine with white-out to make it more visible.
looking down from (ONTOP) of the engine they are behind the water pump
if you look behind the water pump straight down u can see the timing marks.
In the front of engine behind water pump and crankshaft
You dont. It is an LT1 engine and the distributor is behind the water pump.
On water pump
Then the engine will not run
It has a timing chain. A MAIN timing chain runs around the twin over head cams and crankshaft and a SECONDARY chain (balance shaft chain) runs off the crankshaft to turn the water pump. Both have timing marks and the balance shaft chain runs behind the timing chain.
Look at your timing scale the 305 times from behind the water pump & the 350 times in front of the water pump.
YOUR 1990 MAX SOULD HAVE A VG30E MOTOR THAT WAS THE STANDARD.AS FOR THE TIMING MARKS THEY ARE NOT RELEVENT TO THE WATER PUMP.BUT ONLY TO THE TIMING BELT.FOR IMFO ON THE R&R OF WATER PUMP TAKE A PEEK AT MY BIO PAGE I'VE GIVE DETAILS TO OTHERS ON THIS SUBJECT....BUDDY MACK
they are behind the water pump looking strait down from the top of the engine
The timing chain is behind the timing cover which is behind the water pump. To get at it, you'll need to remove everything in front of the cover and loosen the oil pan a little.
There are no timing marks on the water pump.the only timing marks are on the crankshaft and camshaft gears.And if you're working on a quad-four engine as I suspect you are,you will need to line up the holes in the cam sprockets with the holes in the block and insert pins to hold them in place.The correct size drill bits will work good for this if you don't have the special GM tool.