30 over
oversize pistons well of coarse are bigger but you will have to take your block to a machine shop and get them to bore it to the size of the pistons you have best thing to do is take your block and pistons to the shop and let them do that for you depends where you live but to get it bored can average to a $100 or up and if you get oversize pistons you will also need rings to fit the pistons and the other difference in oversize and standard the overside will give you more hp.
Unfortunately this is not a simple "yes/no" question. Sometimes an engine can be disassembled and there is little if any cylinder wear, especially if the oil has been changed regularly and the engine has been properly cared for. If there is no wear you can hone the cylinder walls and put new rings in, provided that the pistons are also not worn. Obviously worn pistons need to be replaced as well. If the cylinders have as little as a couple thousands of "taper" you need to have the cylinders bored and replace the pistons/rings with an over-sized version. That kind of cylinder "boring" doesn't change the displacement enough to make any significant difference.
One would use over-sized pistons and rings (TOGETHER!) when the cylinder has been bored to accept the next size piston. For instance, damage to a cylinder wall may necessitate boring the cylinder an extra 0.020" (twenty-thousandths of an inch). You would then use a piston and ring set that was 0.020" larger than the originals.
Hi, only one size of pistons will fit - need to match the bore diameter - unless you want to rebore the engine to increase capacity. However, there may be a stroker kit available for your particular model.
yosemite is boring
For a WR 500ZE engine that has been bored 50 over, you typically need to use oversized piston rings that match the new bore size. If the original bore size was, for example, 500cc, boring it 50 over would generally require rings sized for a 510cc bore. It's important to consult the manufacturer's specifications or a reliable parts supplier to ensure you get the correct ring size for your specific setup.
Definitely they are not the same size.
wrong size bearings
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It can be done, but the crankshaft would have to be turned down to the correct size. Also, you would need to use the 400 rods or get a custom set of pistons.
A "030 over" 400 engine refers to a 400 cubic inch engine that has been bored 0.030 inches over its stock bore size. The stock bore size for a Chevrolet 400 engine is 4.125 inches, so boring it 0.030 inches increases the bore size to 4.155 inches. This modification can enhance performance by allowing for larger displacement and increased airflow.
An engine housing boring, or line boring machine used to bore the block for main bearings of a crank, where straightness required inline with the each whole according to the crank size