[Bleyseng]

Depends on which1.7L you have. 80hp with 8.2 to 1 compression (70-73) or the Calif version with 73 hp?

You can install 93mm or 94mm with no problems but you need to keep the compression ratio the same. The 93's or 94mm also need bigger valves to get it to breath right. So off go the heads to have larger valves installed (Adrian at Headflow Masters or Len at HAM) plus have the heads cut for the larger register. I think Jake has some 96's that work without being too thin so ask him or check his site Type 4 store.com
I don't mind keeping the nice 90mm domed pistons running as its a nice combo set up by the domes and small head chambers.
A cam change is nice too as the stock cam is pretty weak and hot.