Originally Posted by SafeChav
1.3 engines have smaller bores i believe so therefore small combustion chambers aswell.
The part number is only really relevant to the casting year (1981), hence the 1.3 casting, and some have letters such as BRA after
1.3s have the same bore as 1.6s, hence the head gasket compatibility. BKA it says on mine, and as I've got two of them, we'll possibly try how far we can go grinding-wise and with valve size.
The valve angles are the same too, I assume the radius of the hemispheric chamber dome is the same as well.
Would be interesting to know, as an engine swap is out of question at the mo. It all depends on my budget after the shell's repairs have been paid for.