I've heard a couple different things, but I'd like to know exactly. I've heard 366 and 364 cid for the 6.0, 323 and 325 for the 5.3, and I assume that the 4.8 is around 290-295ish. Does anybody know for sure

 

Look on the radiator shroud. The 5.3 is 324. Not sure about the others though.

 

i thought a 5.3 was a 327?

 

I'm pretty sure the 4.8 is 293ci and the 5.3 is 327ci and I'd put the 6.0 around 366-369

 

4.8=292
5.3=327
6.0=400
Thats my input

 

4.8= 293
5.3=325
6.0=364
I work at a dealer, and this is straight out of gm's technical info.

 

Displacement = (bore/2)^2*Pi*Stroke*number of cylinders

4.8
3.78 X 3.27 === (3.78/2)^2*Pi*3.27*8 = 293.56 ci

5.3
3.78 X 3.62 === (3.78/2)^2*Pi*3.62*8 = 324.99 ci

6.0
4.00 X 3.62 === (4.00/2)^2*Pi*3.62*8 = 363.92 ci

I got these from chevy's website. They list the 4.8 as a 293, the 5.3 as a 327, and the 6.0 as a 364.

 

I thought the 5.3 was actually like a 323 and the 6.0 was 364 and the 4.8 was a 292. Doesnt really make a diff tho it's close enough.

 

RanWalk and Exhappen are correct. I use the formula- pi/4xbore^2 x stroke x number of cylinders.
Philip S.

 

These seem to be the numbers that I've heard most often