30-09-2018, 06:25 PM
Re posting this as I'm still wondering.....
I dug out my spare head and looked at the production date? - 30.7.5 part number 1A 684
Would the compression ratio of this head be any higher than that of the earlier 1929 head with the brass plugs where the priming taps used to be?
Cheers,
Stephen
I dug out my spare head and looked at the production date? - 30.7.5 part number 1A 684
Would the compression ratio of this head be any higher than that of the earlier 1929 head with the brass plugs where the priming taps used to be?
Cheers,
Stephen