240znz Posted December 29, 2004 Share #1 Posted December 29, 2004 Pistons in my L24 have 50 stamped on the top of them. What does this denote?CheersJames Link to comment https://www.classiczcars.com/topic/14475-l24-piston-markings/ Share on other sites More sharing options...
JLPurcell Posted December 29, 2004 Share #2 Posted December 29, 2004 Do you know if the engine has previously been overhauled? JLP Link to comment https://www.classiczcars.com/topic/14475-l24-piston-markings/#findComment-106553 Share on other sites More sharing options...
Bambikiller240 Posted December 30, 2004 Share #3 Posted December 30, 2004 On my recently rebuilt engine the new pistons had 050 stamped and the builder indicated to me that it was a .50mm overbore.PS The original pistons had no markings on the top Link to comment https://www.classiczcars.com/topic/14475-l24-piston-markings/#findComment-106577 Share on other sites More sharing options...
ChrisA Posted December 30, 2004 Share #4 Posted December 30, 2004 Ditto! Original pistons have no marks on top. Chris Link to comment https://www.classiczcars.com/topic/14475-l24-piston-markings/#findComment-106581 Share on other sites More sharing options...
JLPurcell Posted December 30, 2004 Share #5 Posted December 30, 2004 This relates to my original question about the overhaul. I would guess that the engine has been overhauled in which case this is most likely a +50 piston set. Factory piston sets were: standard, ovesize 1 tru oversize 5. Measure the piston diameter, STD spec is 82.99 mm to 83.04 with the oversize 5 being 84.47 to 84.52. The importance of this is that if you plan to overhaul the engine it may be at max wear limit which would require you to install cylinder liners in the block. JLP Link to comment https://www.classiczcars.com/topic/14475-l24-piston-markings/#findComment-106626 Share on other sites More sharing options...
Patcon
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