Type 4 heads

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Anyone know any or all of the inside diameters of the combustion chambers for the 1700, 1800 and 2000cc heads? I thought I had 1700 heads, but with the movement of the cyliders when placed into the heads I am not so sure. I've researched the part #s but my findings indicate that the part #s may not be the best indicator as to what size engine the heads are for.
Thanks

[ratwell]

The part numbers should tell you which engine is ws originally meant for:

http://www.tunacan.net/t4/reference/cylhead.htm