Someone just gave me a 289 V8 that is bored 40 over. I know what that means, but what is the difference going to be in performance? It's a 1965 coupe.
Thx, Chelle

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maybe 2-3 hp

 

thats me ^ there, wife was still signed in.... doh!

 

What does 40 over mean? what does it change? I know what a bore is I just don't know the number that come with it.

 

It means your cylinder bore and piston are .040" larger than stock. A 289 has a stock bore size of 4.000 inches, so a 40 over would have a bore of 4.040"

 

ok thank you

 

theres no mod better than cubes, it should help, i'm not sure but it should be around 292-295 cubic inch now

 

im gonna have to disagree...FI

 

fuel injection? um....you can have more cubes and fuel injection...

 

well ok FI is more important than cubes for horsepower - thats a given. But there is no replacement for displacement, as they say. But going .040 over, or any other overbore isnt gonna really amount to much - maybe 3 or 4 hp at best. Now when you start stroking for 40-50 more cubes - now thats will really help performance.