[quote]

I have a book from Nissan Motorsports that lists the chamber volumes as:
E31 42.4cc
Early E88 44.7cc
Late E88 47.8cc
Take these numbers with a grain of salt as they were published as part of a Big Bore Kit. Until I can verify them I would just use them to represent the ratios of the 3 heads. Maybe we could ask Riley?

In any case I think you'd be restricted to the late E88 since it was the only one that came on the 260. Using an earlier head could throw off your max compression from the spec line in the GCR.