Gen 3 LSJ Short Block


10 reviews

This product is currently out of stock.

Engine - Gen 3 LSJ Short Block
Engine - Gen 3 LSJ Short Block

The Gen 3 block is a huge improvement for GM and solves previous shortcomings of the Gen 1 & 2 versions of the Ecotec engine.  In fact, the Gen 3 block itself supports over 500WHP in stock form.  To make more than 400whp we would suggest better rods and pistons which are available in our Racing short block.

Improvements include:
-Cylinder wall bracing that prevents sleeves from breaking out in high HP applications
-Sand casting which removes porosity found in the older foam cast blocks
-5 pounds of additional aluminum adding internal structural support and solves the coolant jacket leakage issues with Gen 2 blocks

This is a fully assembled brand new short block, includes block, bearings, crank, DI pistons, & rings assembled as in the picture and a new oil cooler.  Does not include the water pump, timing chain assembly (guides/chain), or the front cover.  You will relocate your oil pressure sensor in the hole in the block below the oil filter housing close to the crank sensor.

Important break in procedure:

We recommend running Comp Cams "break in" oil for the first 200 miles.  Before you start the car with the new engine, we recommend that you fill with oil, then leave the injector harness unplugged and turn engine over until the oil pressure light goes out, or even better, use an oil pressure gauge.  This ensures that you are starting the engine with full oil pressure. 

When the engine is running in gear and at light throttle, bring it up to 4500rpm, then coast down to near idle(still in gear), then 5000, then 5500, then 6000, and 6500 each time letting it coast down to idle.  This will help seat the rings. Then after a couple heat cycles, start running it under power.

Freight shipping details:

Freight shipping is free for the lower 48 states.  Feel free to email for a shipping quote for a different address.

When you chose a freight shipping option, we use R&L Carriers.  Our website will email you a tracking number that you will have to enter into the "Pro Number" box on this website page:

Engine - Gen 3 LSJ Short Block
Engine - Gen 3 LSJ Short Block
Customer Reviews
4.9 Based on 10 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
  • intake spacer washers
  • M10-1.5
  • gunna
  • IC bracket
  • bolt holes
  • trip
  • block
  • hardware store
  • thermostat
  • same
Ryan M.
United States United States
One or two small things

Block came well packaged and undamaged, as advertised. However there are a couple things to note. Oil Cooler “thermostat” is not included, I’m assuming the LDK doesn’t run one, so I’m not going to run one. The 2 bolt holes for the upper IC bracket are not the same as the LSJ. Your gunna need an M10-1.5x 60mm, or 70mm, or 80mm, I have to go back to the damn hardware store tomorrow to figure that out since they closed after my last trip and I forgot about the phenolic intake spacer washers so 50mm I got are too short.

Tommy C.
United States United States
Very impressed

I definitely felt a nice increase in power

ZZPerformance Gen 3 LSJ Short Block Review
Tommy C.
Amazing customer service ......

Amazing. Very happy with ZZPerformance !! So I email like it says and boom shipping free amazing!! and it all happened fast while I was working and checking my email I’m very impressed with the results and responses from Ryan from zzp thanks again

Austin S.
I love zzp very great

I love zzp very great people very good Quality in there parts

Test T.