Department of automobile engineering
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| Figure 1 CYLINDER BORING:
The maximum bore oversize is determined by two things: the cylinder wall. Thickness and the size of the available oversize pistons. If in doubt as to the amount of overbore that is possible without causing structural weakness, an ultrasonic test should be performed on the block to determine the thickness of the cylinder walls. All cylinders should be tested. Variation in cylinder wall Thickness wall thickness occurs because of core shifting during casting of the Block. For best results, cylinders should be rebored to the smallest size possible. The cylinder must be perpendicular to the crankshaft for normal bearing and piston life. If the block deck has been aligned with the crankshaft, it can be used to align the cylinders. Portable cylinder boring bars are clamped to the block deck. Heavy-duty production boring machines support the block on the main bearing bores. 
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