I am shopping for pistons for a 1963 Norton Atlas 745 cc. Many suppliers of pistons list 1964 - 1969 as the compatiblity range. Anyone know why a '64 piston may not be compatible with a '63?
The original pistons were dished topped and 7.5 comp ratio. I replaced with 10:1 Comp ratio domed top. That was when fuel was 100 octane. Now I want to drop comp ratio back to 7.5 - 8.5. The 63 Atlas is an export (USA). Bore is +020. Most suppliers I have searched are in the UK.
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