C cm121 New Member Aug 6, 2024 #1 Hi all, trying to work out compression ratio on my 1972 Series 3. Clearly has the raised level but can't tell whether there is an 8 stamped in (see arrows), or its just rusted that way?! Welcome any thoughts. TIA Attachments IMG_1623.jpg 147.1 KB · Views: 111
Hi all, trying to work out compression ratio on my 1972 Series 3. Clearly has the raised level but can't tell whether there is an 8 stamped in (see arrows), or its just rusted that way?! Welcome any thoughts. TIA