2.7conversion!?

[theONE]

is there any tell-tail way of knowing if you've got a 2.7conversion???

[Zayyan]

You could take the engine apart

Getting it on a RR might give an indication...

[Widge]

... but then if it's a crap 2.7 you may never know.
The only way to know for sure is to take it apart, unless it was done professionally and you can find a paper trail.

[Andy_magic]

Take out a spark plug and use a drinking straw to measure the stroke.

320 stroke 66mm

325 stroke 75mm

327 stroke 81mm