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Unusual Pistons

Darren Groves

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This type was fitted to the very early mk1 spits and 1147cc heralds. As others have said they are not as strong and increase the friction, which is why I believe Triumph stopped using them. I have a set of hepolites +20 like that for an 1147 but used a NOS  full skirt version when rebuilding my mk2 spit engine as the output of the mk2 is quite high.

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