WICK3DxGATA

okay so ive been looking on here and havnt found to much info.

i would just like to know what or why the Gen IV 5.3 has so much more power than the Gen III.

RibeiroBJJ

iTrader: (17)

It has the better flowing 799 (243) casting heads, and the TBSS style 90mm intake manifold/87mm t-body, Probably a little more cam as well, but not sure

WICK3DxGATA

thanks for the quick reply. ive just been wondering. my buddy has a gen IV while i have a gen III and i was just wondering why his had so much more power than mine.

i mean i realize its newer and has different parts. i just didnt know what all was different and was just wondering what all was different than mine.

RibeiroBJJ

iTrader: (17)

Plus, I am sure all of the computer functions are a bit more updated(24x/58x)..But the main difference is the LS6 heads (799/243) and TBSS/GMT900 Intake

Whitecrewcab

iTrader: (2)

Newer ones have more compression too. All the little things add up to make a considerable difference.

musclecity85

iTrader: (5)

as well as the better heads and intake/tb. i believe the gen iV engines have just a little more compression as well

1994Vmax

iTrader: (4)

Gen IV's all have flat top pistons in them like the Gen III L33's did..... which also had 243/799 heads but the regular intake manifold.

All Gen IV 5.3's now are 9.9:1 compression..... And laughably the 4.8 was dropped to only 8.8:1...

WICK3DxGATA

thanks everyone. that helps me alot.

RS/SS 4.8

iTrader: (13)

Why is the 4.8 less than the 5.3 in compression ratio. Don't they have the same pistons/heads? My 07.5 4.8 has the same 243 heads as my brother's 2010 5.3 and if the pistons are all flat tops then why the difference? I'm confused.

wheeliE-maxx

Same piston and head with less cubes makes for less compression. Cylinder volume:volume at tdc. Lr4 was 9.4:1 with flat tops and smaller chambers. New ones are 9.1:1 I believe.