[BasherBell]

Don't want to hijack the thread but hoping for some words of wisdom.
I have a 1972 911T 2.4 MFI , completely stock, working through some issues with it, and getting it as good as I/we can.

MFI has been rebuilt and is perfect, top end split down and found the reason why I have repeated gas in the oil issues, 6 oval barrels way over spec for a simple ring job. engine done has about 110K miles) So Ive studied the Porsche PET , and there seems to be a lot of choices of parts for barrels and pistons. Mahle seem a good and fair priced option but What would have been the original part in there ( Not sure what Group 5 and 6 means - enlightenment would help) and what are the recommendations for new pistons-barrels and rings . I'm not a rich man and this will be a regular driver not racer.
Help much appreciated as always.
Cheers from the UK
Dave