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Re: boring .030

BadAss_Beaver said:
why does everyone bore only 30 over, why wouldnt you bore to the max of your engine?

You only BORE the block as much as needed to save some more metal for the NEXT TIME.....:thumbup:


If you bore it all the way.........there's nothing left next time.

And you do not gain much from a bore job..cubic inches wise.

example /stock 350 Chevrolet is only 355 when bored .030 and 360 when bored .060


:thumbup:
 

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Yeah boring a motor to the max is a really stupid move. It adds just about ZERO power (maybe 5 horse) so for that 5 horse, you've cost yourself a new block next time you need to build. Sure there's no replacement for displacement, but boring is not the way to do it.

K
 

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Like everyone else sad you have to have something left for the next time you need to rebuild your engine. The engine i just bought was already bored 40 over and im going to build a stroker out of it. It will be a 385 instead of a 383 and on desktop dyno it shows a gain of 6 ft-lbs of torque with my setup compared to a 383 with the same everything but bore.
 

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Boring to the max also creates more heat. Thats not a good thing. Don't forget the cost. .030 is almost standard these days. Anything larger is going to be special order and cost a great deal more.
 

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bud-23 said:
Boring to the max also creates more heat. Thats not a good thing. Don't forget the cost. .030 is almost standard these days. Anything larger is going to be special order and cost a great deal more.
Yes the more heat the less power you have and about the price machine work around here isn't cheap im not sure about other places but here its 25 bucks a cylinder. On summit and Jegs everything is roughly the same price but at my local parts store a 30 over Hypereutectic piston is about $40 bucks a peice and a 40 over is about $50.
 

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The absolute ONLY reason to bore a block out is to straighten the cylinders for proper seal. As miles wear on an engine, the cylinder gets out of round and can develop a taper fom top to bottom (the size of the bore is bigger at one end than the other). You bore the cylinders out to the next available size piston. Typically most people go .030 over, but you can go .010 up to the max the block can handle.

Bottom line is to bore only enough to be able to clean the cylinders up for fitment of the next size piston.
 
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