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your pistons have a certain size to them, if you happen to wear down your head and looking for a cheep fix you can "bore" (like making a hole bigger) by a certain amount and fit new pistons in, that way you don't have warped piston walls and ensure proper combustion. Also some Honda enthusiasts will bore the head and put in high compression or low compression pistons to either get more hp naturally aspirated or more hp for a turbo setup.
It has nothing to do with the heads, you don't "bore the heads"
its the cylinder walls inside the block that get worn allowing them to become out of "round" oval shaped... this will cause the piston rings to not "seat" well, this in turn allows oil to pass by the rings causing the engine to burn oil. you have the boring part right but it is NOT a cheap fix. by the time you get the machine (boring) work done and buy over sized piston's, rings and all the gaskets and if you hire someone to do it, you're better off to buy an engine, on the other hand if you want to save the labor and enjoy doing it yourself, well.. that's why most people would opt to "bore and rebuild" an engine..
to answer the original question .030 refers to "thirty thousands" over the original bore
What else can I help you with?
What is a ford 289 engine bored out .030 called?
A 289 bored .030 over.
How many cubic inches is 302 small block bored 030 over?
A ford 302/5.0 will be 306ci if bored .030 (4.030" bore)
What does it mean when a car is punched out 30 over?
That means the cylinders have been bored out an additional .030 of an inch, I think.
What is a Chevy 454 bored 030 over?
460
What is a Chevy 262 engine bored 030 over called?
A 262 bored 30 over.
What is a Chevy 327 engine bored 030 over called?
332
If you bored a 250 030 over will you need oversize pistons?
yes
What is the new displacement of a 289 that is bored 030 over?
292.8658So its a 293.
Is 403 a big block?
There was a 402, which was a 396, bored .030 over. No 403.
What does bored 30 over mean?
Each cylinder has been re-bored to a diameter .030" larger than it came from the factory. .030 oversize isn't much. It's done to correct slight cylinder tapering and to put the engine back into condition that it will last. It really isn't enough size difference to produce noticably more horsepower. Note that when the cylinder is bored .030 over, you'll also need pistons and rings that are manufactured to that size.
What is the cubic inch displacement of an AMC 360 bored 030 over?
365 ci
How many cubic inches is a 289 small block bored .030 over?
If my math is correct , almost 293 cubic inches ( using a 4 inch bore that is bored out .030 and a 2.87 inch stroke )
