Customs 30 Over Makes It?

If a 283 is bored 30 over,with the original 283 crank, what does that roughly make the overall displacement of the motor?

 

287? I thnk 60 over is a 292. What is halfway between 283 and 292.

 

Bore squared X stroke X 7854= cubic inch

-Abone.

 

30 over will yield an increase of approx. 4.5 cubic inches.

 

That would be the displacement for one cylinder. Multiply that total times number of cylinders.

 

>X 0 .7854 x number of cylinders

 

A .30 overbore roughly equals 5 cubic inches added to total displacement.. As others have said in this case it equals 287-288 cubic inches depending on how technical you wish to be.

 

286.7

 

Most old hot rodders called them a 288.
Thats what we claimed when NHRA class racing, that way the P&G would show you legal.
These engines are capable of 8000 plus rpm.
SPEEDY

 

3.875 + .03 = 3.905 bore

3" stroke

new displacement = 287

 

Thanks a lot guys I really appreciate your insight!