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Three sizes of pistons are available:
2. Over size 0.010 in (0.25 mm).
3. Over size 0.020 in (0.50 mm).
Over sized pistons and rings are widely used in all automobiles with no trouble at all. They last for more than 200,000 km, provided if the engine oil, oil filter and air filters are replaced at the recommended intervals.
The most important point to consider here is to maintain the oil clearances between the various parts during the machining process.
For example piston to cylinder clearance, crankshaft to main journals and big ends clearance, valve to guide clearance, at room temperature. Then comes cleaning process and the engine assembling process.
tappets are done by the rule of 9 ,ie-1 down adjust 9------- 2 down adust 7 ------3 down adjust 6 .as for timing it shouldnt need touching unless you have points and a distributor which i think this year uses a module inside the distributor cap so it should not need touching
THIS IS FOR A B3000 SERIES.
The manufacturer indicates that this vehicle has hydraulic lifters or adjusters and therefore does not require adjustment.
THIS IS FOR THE B2300 SERIES.
Midrange clearance is the most desirable:
0.22 - 0.28 mm (0.008 - 0.011 inch)
0.27 - 0.33 mm (0.010 - 0.013 inch)