Engine Assembly Question, Which way do the pistons face? Options

[ThinAir]

I'm about to install the Mahle Euro (flat top) pistons and cylinders. I know that it is critical to have the pistons facing the correct direction relative to the flywheel. I'm used to seeing an arrow on top of the piston that is supposed to be pointed toward the flywheel. These Mahle pistons have no such marking.

This picture shows the top of the piston. Is that funny little symbol supposed to represent a crankshaft & flywheel? Is it critical which side faces the flywheel end or just that all the pistons are the same?

I'm hoping someone answers quick - I'd love to get the heads on tonight!

[type47]

i'm doing the same thing (assembling the engine top end)

i cc'ed the heads (made my own plastic disc and borrowed a burette from the chemistry teacher). pretty messy the first time but got about 61 cc/head.

checked and rechecked the deck height. i finally measured .030". i don't see how people can measure to the thousandths as the uncertainty has to be .002-.003". maybe something i'm doing is wrong but i'm using a caliper with a depth "stick" (thing that comes out the end of the caliper) and a ruler. i used a dial indicator to bring piston to TDC. then i measured the width of the steel ruler, then with the caliper on the ruler extended the stick to touch the piston crown. from that measurement, i subtracted the width of the ruler.

unfortunately, the order containing my cylinder spacers is going to the wrong address (UT instead of VA, but that was probably my fault, i thought i changed the delivery address) so progress has ground to a halt.

i did measure the crankshaft end play and have the final solution for that and i cleaned the pushrod tubes and ordered oil pump mounting studs from the porsche dealer. HA, he listed the price as 50 cents per stud! (N014.532.2) 8mm x 32mm