23-07-2018, 12:34 PM
(This post was last modified: 23-07-2018, 12:43 PM by Jeff Taylor.)
The numbers you've found on the piston crown show that these are quality Hepolite manufactured Austin Seven pistons - their Ref. No. was RS11063. They're obviously + .020" oversize (Standard bore size being 2.20") with two piston rings at 1/16" thickness and two rings at 5/32" thickness. The 'RS' in the reference number denotes a "Super Drain Oil Ring below Pin; Split Skirt Compensating Aluminium Piston". The good news is that at + .020" the block has only been rebored twice, the first would have been + .010".