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2.5/260 hp 153ci sleeve clearnence

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dear hot rodder

I've got mercuty 153 ci 260 hp 2.6 offshore motor with 6 chroom sleeves

and would like to switch to cast iron (los angelos) sleeves

my question is with is the exact or best clearence between

the sleeve and piston

on the other hand also would like to port the inlet and exhaust port

so how big should I go as I dont want to port bigger holes and spoil

my expensive block

my boat is stv 18 feet

your hight response will be hightly appreciated

best regards

ga

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