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Why Big Bore kits are a No in my book

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Trigger:
I refuse to fit or rebore for such kits for the reason in the picture. Bryan has mentioned it before but, today I had a chance to take a pic of what can happen to a liner if past OEM spec. Yes, I know my camera is shite but the crack is under the red straw  ;)

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Bryanj:
Thats why the only ones i considder are those that come with thicker liners, more expensive to fit because of the cost to bore the block and maybe cases but safer

Tomb:
That looks like quite a thick liner and it still cracked :-\

andut:
That's an interesting post Trigger !

I stripped my project 400/4's engine a few weeks ago to find a set of 54mm Yoshi big bore pistons installed (have since contacted the original owner who told me that he had Dixon racing fit the Yoshi kit and do a bit of head rework back in the 80's)  The pistins and bores now mic up to just about max clearance and are a little oval, so I figured the only option is Cruzinimage's 54.5mm big bore kit - would you avoid that on the 400 ?  I guess the only other option is to look out for another set of barrels or new liners if they're available anywhere ?  Any recommendations ?

Thanks in advance !

Andy

Colonial-Clive (yindi):
I ran a 605 kit on my 500/4 back in the 70,s and have just put a 600 kit in my 550, I've been lucky and not had any problems with them.

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