Please post here general instructions and tips regarding adjusting intake/exhaust valve clearances (shims) on a 308. Indicate if your advice is for 2v or 4v engines. At the time of creating this thread, there is no such article posted in http://www.ferrarichat.com/forum/308-328/281516-interesting-3x8-technical-diy-threads.html. If there are other good threads, please post links to them here as well. In other treads, the following points were made about the importance of adjusting valve clearances and valve timing (correct me where I am wrong in my understanding): 1. The Owners Manual advises checking valve clearances at 15,000 mi / 24,000 km intervals. 2.The valve clearances can drift materially from the factory specified clearance by this interval. 3. The consequence can be a loss of clearance between the cam lobe and the shim. If this clearance reduces to zero, the affected valves will no longer fully close, hot combustion gases will blow-by the valve and this will result in a burnt valve requiring an engine rebuild to repair. 4. A compression or leak-down test can reveal damaged valves, but is of no value in indicating valve clearance adjustment. 5. Often cam shaft seals are replaced at the same time as the valve adjustment on a while youre in there basis. 6. The valve clearances can be adjusted independent of a timing belt replacement, although they are usually done together as part of the famous Major Service. 7. Adjusting the valve timing requires the cam belt covers removed, so the most logical time to check and adjust valve timing is the same time the timing belts are being replaced. 8. Having valve timing off-spec is less serious than having valve clearance off-spec. To a limit, the only consequence of having valve timing off-spec is a small loss of performance (power). ... I, of course, have a selfish interest in this thread: I need to check/adjust the valve clearances on my 1983 308 GTS QV within the next few months.