Originally Posted by rsfyj
I cant seem to find any thing on the Mercury pistons that have the expansion slot in them. I need to know when you install them in the engine does the slot face the Thrust side of the cylinder wall or towards the intake. The engine I took apart was 50/50 2 one way 2 the other way. Those 4 pistons were burnt with a hole on the thrust side of the pistons. I would think the piston slots would need to be all one way not random. I need a Flat head expert to answer this. I have rebuilt lots of Ford engines but never a Mercury with these pistons ,
A picture or two would be nice. By slot, would you be referring to the chip taken out of the piston face that is on the thrust side to clear the head?
Or, try this: http://www.hotrod.com/techarticles/e.../photo_15.html