kk 330 vs. bb 351...???

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Sep 17, 2010 | 08:08 PM

#11

TNC

Senior Member

Joined: Sep 2009

Posts: 5,050

From: Abilene, TX

1st Gear Member

Quote:

Originally Posted by roadglider

I vaguely remember something about this. I think that the 250 cylinder has a smaller outside diameter than the 300 cylinder where it fits into the cases. So that when you over bore it you need the extra metal of the larger OD 300 cylinder. Or something like that. I can't remember for sure though. I'd ask Bill Blue.

rg, I believe that 250 and 300 difference only involved the older generation 250's...not sure which year that point occured. On those older 250 cases, the stock 300 cylinder would not fit...too big at the bore extension. Dimensionally the modern 250 and 300 cylinder have basically the same numbers.