75 Sno Twister - 429 & 436 engine differences

[snowman65]

Hi;
Just wondering why in 1975 some Sno Twister's had 429cc and some had 436cc.Is one more desirable than the other.What would be the differences in these engines.I do believe the bore size is the same.
Thanks

[SHewelt]

I never knew they said 429 or 436. They were all 67.5mm bore & 60mm stroke (75-4402RS), so regardless of what it said, they are the same displacement & same parts...