8V Heads - Interchangeable?

[Mac Crash 78 1 Cars]

We have an early (87 phase one 1.9) cylinder head... before taking it to the machine shop, will this be okay to fit onto a later 1990 1.6 engine? any differences we should know about? The older head as said originated from an early 1.9, is gas flowed and skimmed for 10.5:1 CR with 270 cam... I'm thinking the heads must all be the same but the piston crown volumes differ between the engine sizes, looking for confirmation and/or advice on this.

Edited March 10, 2016 by Mac Crash

[Anthony 1,003]

Later 1.6 GTi (115hp) and 1.9 GTi heads are the same. As you say, it's the bottom end that differs together with the camshaft.

[ALEX 98 1 Cars]

There's two sizes of inlet valves. the early xu5j had smaller ones fitted.

I think all 1.9's (xu9j) were the larger size.

Cams are different as well