LS3 vs LS9 Block

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MechMan

MechMan

Master Mechanic
Sep 13, 2018
261
28
Long Island NY
I am currently in the planning phase of a LS motor build. I am planning on building an LS3 but i see that the LS9 block is about $32 cheaper on summit. It really is a insignificant differance but it got me thinkg. What would the advantages be to use the LS9 block instead of the LS3? Not going to do any forced induction with this build. what is everyone's thoughts?
 
MechMan

MechMan

Master Mechanic
Sep 13, 2018
261
28
Long Island NY
Is the LS9 dry sump? I'm thinking it is, and that might be a problem for a regular street build.
As far as i knew it could be wet or dry. Was just curious why it would be cheaper and if there really was any benefit to using the LS9 for N/A.
 
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CaliWagon83

CaliWagon83

Royal Smart Person
Supporting Member
Nov 12, 2017
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LSA is wet sump. It’s similar to the LS9, but there are some differences. Strange that it’s cheaper.
 
MechMan

MechMan

Master Mechanic
Sep 13, 2018
261
28
Long Island NY
LSA is wet sump. It’s similar to the LS9, but there are some differences. Strange that it’s cheaper.
I know. I used the part number that was givin and found it on jegs for about x2 the price. Not sure if someone messed up at summit.
 
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81cutlass

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Feb 16, 2009
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Northernregal

Northernregal

Royal Smart Person
Oct 24, 2017
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Red Deer AB
LS9 Has billet mains and uses 12mm head bolts rather than 11mm. Those are the differences I could find, other than the oil squirters.

That would deter me because the cost savings would be eaten up on the corvette tax for the 12mm head bolts. Strength wise I don't think you would see the difference unless you were building a max effort race motor. My opinion is 2002-2004 LQ4 block, as they are the same basic casting as the aluminum LS1, so over built for a iron block. The LQ4 block is cheap like Ramen noodles on summit, if you needed to go new, although they have proven to be more than adequate from high mile donors. 😉
 
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motorheadmike

motorheadmike

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Nov 18, 2009
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Ottawa, Ontario Canada
Siamese bore aluminum 5.3L is the bees knees.

The LS9 block is just for Cars and Crappy bragging rights. Honestly any decent L92 gets you all the engine you will ever require - just add a cam and boost.
 
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