1) are stock 2 liter pistons dished?

1.5) 2 liter pistons are 93mm, correct?

2) how do I tell a bus 2 liter head from a 914 2 liter head? Are there additional ports in the head?

3) what are the valve sizes in a the 2 liter head?

TIA

1) not positive, but yes? For some reason I thought bus pistons were dished.
1.5) I think they are 94mm
2) 3 bolt intake pattern...and casting numbers.
3) 42 x36 mm valves

Hope that helps. Someone else will surely chime in and correct me and give you more detailed info.

Slightly dished (unless they're euro)

94mm

Three intake manifolds studs. '75/'76 have air injection ports in the exhaust

42m intake, 36mm exhaust



EDIT: You beat me to it, Mike

You gave more detail and I was just guessing from my memory of all the threads I've read. I've never even owned a 2 Liter! Thanks for the confirmation that I'm not losing my memory......completely that is!

US 2.0 pistons were dished. The original Euro-spec 2.0 pistons were also dished, but had a different (smaller) dish. Later European-spec 2.0 pistons were not, and are often called flat-topped.

The 2.0 Bus pistons had a larger dish.

--DD

How do I tell the difference? Is there a diameter to the dish that I can measure?

Not diameter, it's the cc of the dish. Maybe I can find images later. Regardless, from what I can find the 914 had a 7 cc dish and the bus had a 12 cc dish.

What they failed to mention is that 2.0L Bus heads have 4 intake mounting studs, just like the 1.7/1.8 and carry part number 022 101 372G.

2.0L 914 heads carry part number 039 101 371A.