Arrows show where the holes are.
Most older 2.4 L Mercs. have only 2 holes here. I drill an extra one at all 4
spots in the block. Take care not to drill thru to the outside or you will have
a leak. If this happens, you can build up some JB Weld to stop it, but we
would rather not have this! Also, the water diverters to route the water
the long way around the cylinders. These are regular 1/4" ID rubber fuel line
pieces cut to fit. Leave an 1/8" open at top and bottom (eliminates stagnant
water)
Good luck!