Block markings

[Bob Culver]

Are the pistons original pattern ie 5/32 wide rings and no skirt split? Replacement rings could be a problem and often of very heavy section leading to the top groove wearing excessively. With medium worn bores (.005 os so taper) and drilled oil rings our car used almost no oil with this type of piston. Second rings usually hardly wear and top groove can be turned for two thin rings.
Simple fully split pistons as the A30 went out of favour. The skirts rapidly closed up and failure as illustarted was common. (I sold a Javelin witha skirt missing. cash sale) There were several peining or shot blasting processes to expand the skirts...often followed by failure.