anyone have a remote clue what comp ratio i have?

[liam012]

I am utterly useless at this and wondering if anyone can help out

320i head
oem gasket
eta block/crank/pistons and rods

i have been told
"9.0:1 with stock head gasket. 731 is the same casting as the eta head"

is this true?

[Gunni]

731 is NOT the same casting but may have the same head volume,

[chu346]

It depends on the year of the eta block. Early about 11:1, late 10.2:1

[liam012]

is there a way to tell - engine code is rusted away though the block does have the casting numbers -

[chu346]

I think early ones have a big core plug at the rear of the block near the flywheel.

There are slight differences in piston shape aswell, I can't remember which are which though. Try a search.