Referring to my recent post
https://www.the75andztclub.co.uk/forum/showthread.php?t=58164 There was no further miracle. After much head scratching I removed the head by following advice from Haynes and positioning the crankshaft 90 degs BTDC. Examination of the pistons revealed a small piece missing from number 1 that had melted right on its edge causing complete loss of combustion. I have now ordered a replacement piston from Xpart and have clamped the liners, but, as you may have guessed I can't budge the crankshaft to a position where I can access the big end bolts on number 1 conrod. Anyone any ideas?