# Rebore spec ? - LM
**URL:** https://forum.motoguzziclub.co.uk/t/rebore-spec-lm/919
**Category:** Big Block Tonti and Loop Frame models
**Created:** [15 October 2013 21:09 UTC](https://forum.motoguzziclub.co.uk/t/rebore-spec-lm/919 "2013-10-15T21:09:54Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Exmembers](https://forum.motoguzziclub.co.uk/u/Exmembers)
#### Post date: [15 October 2013 21:09 UTC](https://forum.motoguzziclub.co.uk/t/rebore-spec-lm/919/1 "2013-10-15T21:09:54Z")
Help please ?
Sent my Le Mans cast iron barrels for a rebore
For fitting 2 nd oversize pistons ( new old stock)
The shop doing the rebore wants to clarify the
Piston clearance spec for 83 mm pistons in iron bores ?
Anyone got the tech spec handy to answer that one
Would be very grateful 🙂
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### Author:  [@Doug\_McLaren](https://forum.motoguzziclub.co.uk/u/Doug_McLaren)
#### Post date: [15 October 2013 21:27 UTC](https://forum.motoguzziclub.co.uk/t/rebore-spec-lm/919/2 "2013-10-15T21:27:21Z")
From the factory manual:-
Original is 83mm - 83.018mm,
1st oversize is 83.4mm - 83.418mm,
2nd oversize is 83.6mm - 83.618mm.
If you pm me your email address I’ll send you a scan of the page.
P.S. Just got your email from your profile, page scan on it’s way.Doug McLaren2013-10-15 21:30:47
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### Author:  [@Exmembers](https://forum.motoguzziclub.co.uk/u/Exmembers)
#### Post date: [15 October 2013 22:07 UTC](https://forum.motoguzziclub.co.uk/t/rebore-spec-lm/919/3 "2013-10-15T22:07:38Z")
Thanks great help !