Wierd Engine ?

[AFSP1211]

Ok, so on another forum there was a guy who said that in 99-00 "in rare cases" some blocks were stamped 4.8/5.3/6.0, meaning that the same block could be use for all 3 applications. Is this true or is this guy blowing smoke? If it is in fact true could I just have my 1999 4.8 bored to 6.0 spec and then just get a 6.0 crank for it? Not sure if this would be more cost effective than buying a 6.0 or not. My thinkin is that if all I need to buy is a rotating assembly,cam and some 243's I can put more towards a built 4l80.

[George C]

blowing smoke,

a 4.8/5.3 can become a 364 but its to much work since it uses a specific crank

typically the 4.8 becomes 346

[MikeGyver]

I think that 99turbogmc is asking if his 4.8 might have cylinder walls so thick that they could be bored all the way to 6.0 size.

[AFSP1211]

I think it'd just be easier to keep my engine in my truck while I build up a 6oh. So, is 408 the max a 6.0 can be bored to. That's a bore of .060 right? with stock crank or a 4.1" crank?

[George C]

I think it'd just be easier to keep my engine in my truck while I build up a 6oh. So, is 408 the max a 6.0 can be bored to. That's a bore of .060 right? with stock crank or a 4.1" crank?

408 is a 4.030 bore with 4" crank

[AFSP1211]

Ahhh, I see. I've always wondered how to figure displacement using stroke and bore. Care to enlighten me quick?

[George C]

I think that 99turbogmc is asking if his 4.8 might have cylinder walls so thick that they could be bored all the way to 6.0 size.

i answer that. most a 4.8/5.3 block can be bored is 346. it can be a 383 with 4" crank

a 4.8 can become a 364 but its a stroke thing

[MikeGyver]

radius squared times pi times stroke times 8
or 4.03 Divided by 2 = 2.015 (radius)
2.015 x 2.015= 4.060225
4.060225 x 3.14159 (pi) =12.75556225775
12.75556225775 x 4 (stroke)= 51.022249031
51.022249031 x 8 = 408.177992248

[AFSP1211]

Ahhhh, so the volume displaced by the piston during movement multiplied by stroke then multiply for each cylinder.
I just used this site:
Interactive Engine Displacement Calculator
I figure if I bored a 6L to 4.060 then got a 4.125 crank I'd have me a 427. This is sounding very tempting. Can a 6L block hold a 4.125 crank?

[George C]

Ahhhh, so the volume displaced by the piston during movement multiplied by stroke then multiply for each cylinder.
I just used this site:
Interactive Engine Displacement Calculator
I figure if I bored a 6L to 4.060 then got a 4.125 crank I'd have me a 427. This is sounding very tempting. Can a 6L block hold a 4.125 crank?

dont do that, stick with a 408. that goofy crank would cause havioc. also the block isnt strong enough at that thickness. some do it that thin but eh id stay away. plus its custom pistons which is godly amount

you want a 427 do it the good way. 4.125 bore of a X block with a 4" crank. which you can find pistons OTS