383 ?

 

(pi * (3.75" / 2)^2 * 3.5") * 8 = ?

 

In english? lol

 

I calculated 309ci. But I think that 3.5 stroke is more like a 3.48, which would make it your run of the mill 305. That is unless it is stroked .02".....

 

Pi = 3.14159; Please Excuse My Dear Aunt Sally.

 

You need to specify a little better, maybe some background on what you are specifically asking. I assume you mean 3.75 inch bore and 3.5 inch stroke. I think what you are asking about is a 305, 3.736 inch bore and 3.48 inch stroke.

 

on pistons says .40 the bore is 3.76 If i measure from the the piston at the bottom to the top of the block its 3 1/2 (Motor is painted orange in side).when was in car ran very well.Not like a 305.Orginal its was a 305.
But with piston saying .40 .40 over?Has some other numbers on the pistons to.
Can see that it has been rebuilt.

 

It's a 305 bored .040 over. The bore is 3.775" and the stroke is 3.48", but you're not using measuring accurately enough to tell.

 

Was told it was made into a 383 ,what do i have to do to find out?Just want to make sure what i have here.

 

You don't have to do anything to find out, because it doesn't.

 

That IS English; had you been paying attention in school at any time since about the 6th grade, you'd recognize it instantly as the formula for the volume of a cylinder (times 8 of course, to make it a V8). I'm sad for you if you don't.

A .040" over 305 is about a 312.

Not enough different from what it started out as to be any kind of noticeable, in and of itself.

 

I hate to say it, but that person lied to you.

 

What's 80 cubic inches between friends, anyway?

Stock 305 is 3.736 bore with a 3.48" stroke. So 40-over is 3.776, like was said above. It also means the engine is already on it's 3rd life (stock bore, 30-over and finally 40-over). I wouldn't try 60-over with a stock block, nor is it cost effective to go through all that work when you could just build up a 350 (4" bore block) for the same money. A subject that has been argued to death on this board and many others.