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Hi Clive, I am pretty sure Robsport don't fit TR7 pistons to Sprint engines! Sprint pistons are available so I would be inclined to do the job properly and fit Sprint pistons.
Trying to deck the block and taking a bit off TR7 pistons is a bit of a bodge, you'll need to ensure that the valves still clear the pistons, which I suspect you will have an issue with after decking at 20 thou plus shaving the piston crown, it will just create a whole world of problems.
I have bought from these guys before and although they do come from Oz, they are cheaper.
https://www.autosurplus.com.au/triumph- ... 20~5799333
I spoke to robsport, who confirmed they do.... (in retrospect, I didn't ask if they always fitted them, but teh answer was affirmative and clear)
Too far down this route now, the budget won't extend to a near enough £800 set of pistons and possibly another rebore if the pistons are out of spec (likely) Or indeed try to find a decent block to start again.
The block needs decking because of some marks on the face, so that has to be done anyway. So even new sprint pistons would need work. I am happy to use a lathe to machine the pistons down by the corresponding amount. Valve cutouts I have a cunning plan......
Sometimes I wonder if fitting a modern engine would have been the easier option
Anyway, anybody got info on head depths?