gritsak

my friend is thinking about buying a used GSR block with these sleeves installed...i searched around but couldnt find any info on them or pics. my friend called up darton and they said the sleeve are only designed for boost around 18psi, which is what he used to run on his stock sleeve block so if they arent gonna hold up to at least 25-30psi then what the point anyways...

he will be keeping them at the stock 81.5mm bore

so does anyone have pics of these sleeves installed or any additional info/input on them? thanx