age is only a number
AO Gold Member
Join Date: Aug 2004
Don't really think either of the issues you mention are significant.......main cause of belt failure tends to be tensioner failure, causing free play in the belt, although aged belts can suffer from the teeth stripping off the belt at the crank pulley. It does appear to be a bit of a lottery, though - you hear of people suffering failures well under the 36K change interval, but also of people managing over a 100K miles - IIRC Smaky ran his 146 as an experiment to 118K miles before the belt failed - at which point, as he could swap the head himself, he was well ahead, costwise, having saved 3 belt changes.....
AROC Vice-Chairman and Lancashire Section Secretary
Alfa organ donor to the gentry......