16-02-2018, 09:31 AM
.025 ring gas are not ideal but many old books give that sort of figure as a refit limit. I suspect the coarse finished rings soon develop such gaps anyway.
It seems a waste to not utilise the good block. In the 1960s and 70s there were many knurling, peining etc process to expand pistons. Often a disaster if cracks started, esp on split skirts but many successful. Do any vintge specialiats still do?
The black varnish is characteristic of 1930s style non detergent oils.
It seems a waste to not utilise the good block. In the 1960s and 70s there were many knurling, peining etc process to expand pistons. Often a disaster if cracks started, esp on split skirts but many successful. Do any vintge specialiats still do?
The black varnish is characteristic of 1930s style non detergent oils.