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Old 06-04-2021, 04:57 AM   #1
aaberg
 
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Urgent: Will W-pistons fit a J-engine?

My car is a Camaro 2012 2SS automatic with original L99-engine. Vin 2G1FK3DJ7C9105243

I will remove the Auto Fuel Management (AFM), keep VVT and restore engine. I have ordered pistons from Summit and just got a call from my speed shop that the pistons I have ordered are plain at the top and don't have any place for the valves, that original old pistons have.

Looking at Summits website: https://www.summitracing.com/parts/S...%2byear%3a2012

The text says these pistons are for engine W but nothing to find out about engine J.
I will also add a cam stage 1 kit: https://www.summitracing.com/parts/cca-mk189-301-13

So, the bottomline and question is: Will these pistons fitt my L99-engine?

(Yes, I know they are over borred .020).

Last edited by aaberg; 06-04-2021 at 10:38 AM.
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Old 06-04-2021, 12:48 PM   #2
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You would likely need to get rid of the VVT to run with the flat top pistons (LS3 conversion). VVT needs pistons with valve reliefs for proper PTV. This is a very generalized answer, so hopefully someone else will comment.
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Old 06-04-2021, 03:37 PM   #3
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You need the scooped out pistons to accommodate VVT.

Do not put in the flat topped pistons, the valves will crash into them.

And why get rid of VVT? It gives you a nice flat torque curve that is great for low end torque.
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Old 06-04-2021, 07:58 PM   #4
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Quote:
Originally Posted by Rock-It Man View Post
You need the scooped out pistons to accommodate VVT.

Do not put in the flat topped pistons, the valves will crash into them.

And why get rid of VVT? It gives you a nice flat torque curve that is great for low end torque.
Right, I agree. I was only stating he would have to get rid of the VVT to run those pistons. The better solution would just be to get the correct valve relieved pistons.
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Old 06-04-2021, 08:30 PM   #5
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Quote:
Originally Posted by InFiD3ViL View Post
Right, I agree. I was only stating he would have to get rid of the VVT to run those pistons. The better solution would just be to get the correct valve relieved pistons.
If I were that deep I would just forge the bottom end, thats just me though, just my opinion.
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Old 06-04-2021, 09:49 PM   #6
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You could possibly have those pistons fly cut for the PTV. Not sure how much material there is in the crown though, just a thought.
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Old 06-04-2021, 11:39 PM   #7
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i had my dod/afm tuned out(makes it a different car) it seemed like like unnecessary work going into the motor unless you are going cam swap. imo with a gear change and a tune the l99 is a good set up. i have had a few friends say my l99 car is faster than my ls3 car was still the ls3 was more fun mainly because the tr6060 and 3.42's. i hate to say it but cam, converter and gears makes the l99 a STOUT performer....quite possibly better than most ls3 cars.
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Old 06-05-2021, 04:12 AM   #8
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Quote:
Originally Posted by lemontwist View Post
i had my dod/afm tuned out(makes it a different car) it seemed like like unnecessary work going into the motor unless you are going cam swap. imo with a gear change and a tune the l99 is a good set up. i have had a few friends say my l99 car is faster than my ls3 car was still the ls3 was more fun mainly because the tr6060 and 3.42's. i hate to say it but cam, converter and gears makes the l99 a STOUT performer....quite possibly better than most ls3 cars.
I agree.
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Old 06-05-2021, 04:53 AM   #9
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Where to find J-pistons?

Thanks for your advice. Seems like I need to swap J-pistons since I want to keep VVT. Can't find any at Summit and Rockauto doesn't have them in stock. Any suggestion where to find them?
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Old 06-05-2021, 10:16 PM   #10
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If the cam will work in an ls3 then it will work in an l99.. im also assuming you're getting the rotating assembly balanced..
If your planning on boost at all then I strongly recommend resleeving the block while you're in there.
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