Where to buy engine parts from??

[sports racer]

So curious as to what the difference is between the standard 1.6 and the gti eg engine is? (

The 1.6 GTI engine has the combustion area in the pistons and the head is completely flat so you can't fit a GTI head on a normal 1.6 engine. They were loved by the old Formula 2 racers because you could get 170hp out of them without exceeding the 1.6 engine limit for the class.