Bore a 4.8L?
12-11-2006, 11:40 PM
#12
if i remember right, the piston hieght is the same on the 5.3 as the 4.8 even though the 5.3's are dished and the 4.8's are flat top. meaning you could use 5.7 pistons and stock 4.8 crank and rods. they just used a longer rod to make up for the shorter stroke.
12-12-2006, 08:17 AM
#13
Staging Lane
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does anyone know what the compression would be if I bored my 4.8L to a LS1 bore, keeping the stock crank, rods, heads, ...
I think right now stock it is 9.6:1
oh, and flat-top LS1 pistons!
I think right now stock it is 9.6:1
oh, and flat-top LS1 pistons!
12-13-2006, 02:16 AM
#15
Tribe Shaman
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compression should be higher then the LS1.
the 4.8 heads have a much smaller combustion chamber.
guess im kicking around the same idea as a few of you are too.
right now im looking at droping in a 4.8 crank in to a 5.3.
with the smaller rotation and the shorter 5.3 rod, compression should really drop.
add a set of 317 6.0 heads to drop it more.
valve clearence should be more then enough for any cam.
just wondering what the max boost level will be before any knock shows up.
the 4.8 heads have a much smaller combustion chamber.
guess im kicking around the same idea as a few of you are too.
right now im looking at droping in a 4.8 crank in to a 5.3.
with the smaller rotation and the shorter 5.3 rod, compression should really drop.
add a set of 317 6.0 heads to drop it more.
valve clearence should be more then enough for any cam.
just wondering what the max boost level will be before any knock shows up.
12-13-2006, 01:28 PM
#17
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Originally Posted by screamingjimmy
what if a guy took a used iron 6.0L block, bore it to 4.030, throw in a 4.8L crank and rods, build a little high revver.......
has it ever been considered? I guess that a guy would be better off to go with a 6.0L at that point instead of "de-stroking" an engine!
there is no replacement for displacement!
has it ever been considered? I guess that a guy would be better off to go with a 6.0L at that point instead of "de-stroking" an engine!
there is no replacement for displacement!
If you had a solid roller revvign to the limitations of piston G's- you might have a case.
12-13-2006, 10:46 PM
#19
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Hmmm . . . I was thinking of builing up a high revving 4.8 for my AutoX car . . .
4.8 = $800
LS anything = $1800+ (At least in my neck of the woods)
A crazy wild cam in a 4.8 @ 7200 rpm w/ T56 and 4.44 be a dream 2800 lbs car
4.8 = $800
LS anything = $1800+ (At least in my neck of the woods)
A crazy wild cam in a 4.8 @ 7200 rpm w/ T56 and 4.44 be a dream 2800 lbs car
