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I have a BMW E36 325 (94) model .
I decided to put 20 thou pistons cause the block was over bored.
Should I expect any gain in HP?.
 

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Two month late, so I assume that you already have the answer...
The increase in the engine's capacity from a +2-thou re-bore is so small that even with the most sensitive equipment, with an experienced operator doing the dynamometer test, they would be hard-pressed to measure any power increase.

Unless your engine was worn out, then of course, you would experience better performance. At college, I was told that + 3 to 5 BHP on a modern 1.5 litre engine is the improvement it takes for the average car owner to detect a difference.

In my experience, one of the most noticeable improvements to a car's driveability & feel comes from fitting a new Lambda (O2 or Oxygen sensor) sensor on higher mileage cars. I think that aside from the engine, new suspension bushes, shock absorbers, tyres and new steering racks are tops for improving how an older car drives.

Having say that, after 40 years as a mechanic, I swear that when I do an oil + filter change on my own E36 BMW, I can detect the difference :)
 
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