Here's one for any of you number crunchers out there who know how to figure out an engine's new cubic inches measurment and literage. It's a SBC 400, bored +.020, with stock crank and stock rods. I would like to know what it is now, since it used to be a 6.6 liter 400. Thanks guys...

 

It's still a 400.

It had 401.6 CI before it was bored; now it has 404.8.

But it's still a 400.

 

not quite sure, but i think a 400 bored 30 over is considered a 406 if that helps at all, probably not

 

What?!?? You mean it's STILL A 400!?!! It didn't magically change into something else?

Quit boring your engines out and buying stroker cranks...it'll still be a 400....

 

400.92 before, 404.23 after, by my calculations.

Using 3.1415926535898 for pi, and 3.75" stroke.

 

Yeah I actually was planning on stroking...or de-stroking the engine. My plan was to drop a 350 crank in the 400, making a 377. The goal for that combo was not just a size or power thing, but I thought a 377 in a '77 Vette would be novel. When I got around to it, I decided instead to just leave it a 400. Then I found that rust had taken it's toll on the cylinder walls, and needed to be bored over. The machine shop understands that sometimes less is more, so they bored it +.020 instead of the more common +.030. I'll round the CI to 404, but I was still wondering what the literage would be. Maybe a 6.7, or is it still in the realm of 6.6? Thanks guys...

 

Stock un bored 400 is......

400.9212 cubic inches

6.569921 Liter

bored .020" over puts it at....

404.8183 cubic inches

6.633784 Liter

 

Thanks for the help everyone...you've been a big help.