Hi. Broadly speaking, about 130,000 miles. A rebuild to factory spec will cost about £1000 in total, if you're building it yourself.
It's absolutely crucial to measure EVERYTHING accurately! You'll need about 3 different sizes of micrometer to measure up to 85mm, vernier callipers, dial bore gauge, feeler gauges.
You'll also need a good machine shop who can skim heads/blocks and rebore as necessary.
It's not exceptionally difficult if you've got mechanical sympathy. But you have to be absolutely anal with cleanliness and taking measurements. Measure 5 times, torque twice, cut once!
Parts and sundries for these engines are quite expensive compared to a lot of other engines, so you really don't want to have to do replace anything twice.
Moderator note. Please do not offer goods or service for sale outside of the marketplace.
Last edited by petep; 19/11/2012 02:00. Reason: no selling here please