New iron block differences
Thread Starter
On The Tree
Joined: Sep 2012
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New iron block differences I see summit has 2 different 6.0 iron blocks available. One is for the lq4/9 replacement and the other ly6. The ly6 replacement is a little more then 1100 bucks and the lq4 is almost 1700. What are the real differences in these blocks ? From what Ive read, the blocks themselves are very close, yet the price is almost half more from one to the other.
Thanks for any help.
Thanks for any help.
I'm not really sure, but going to take a guess that one is current production with AFM and the other is old style non-AFM.
Try Google-ing LQ4 and LY6 and see if you can decipher from any specs that are out there.
Try Google-ing LQ4 and LY6 and see if you can decipher from any specs that are out there.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
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From: Central Cal.
I'm betting you nailed it right there. The new Gen III blocks are getting in short supply, thereby raising the price of admission (the old supply/demand issue). Meanwhile there are PLENTY of the newer Gen IV to be had.
Thread Starter
On The Tree
Joined: Sep 2012
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i thought they stopped making gen 3 blocks for a while, then started back up again
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,615
From: Central Cal.
Thread Starter
On The Tree
Joined: Sep 2012
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One is a Gen 3 block the other is a Gen 4 block.
Chevrolet Performance 12679002 Details
Cast-Iron Production LS-Series Engine Blocks
Direct replacement for Gen III Block LQ4 & LQ9
Production cast iron block
Production oiling system
6-bolt main bearing caps
4.000" finished bore (101.60mm)
9.240" deck height
Chevrolet Performance 12609999 Details
Cast-Iron Production LS-Series Engine Blocks
Direct replacement for 2008-2010 Gen IV Block RPO, LY6 & L96
Production cast iron block
Production oiling system
6-bolt main bearing caps
4.000" finished bore (101.60mm)
9.240" deck height
No provisions for Active Fuel Management
Supports 500+ Horsepower
Chevrolet Performance 12679002 Details
Cast-Iron Production LS-Series Engine Blocks
Direct replacement for Gen III Block LQ4 & LQ9
Production cast iron block
Production oiling system
6-bolt main bearing caps
4.000" finished bore (101.60mm)
9.240" deck height
Chevrolet Performance 12609999 Details
Cast-Iron Production LS-Series Engine Blocks
Direct replacement for 2008-2010 Gen IV Block RPO, LY6 & L96
Production cast iron block
Production oiling system
6-bolt main bearing caps
4.000" finished bore (101.60mm)
9.240" deck height
No provisions for Active Fuel Management
Supports 500+ Horsepower
Staging Lane
Joined: Jan 2012
Posts: 56
Likes: 0
From: Nashville Tn.
Almost all Chevrolet parts that are currently available but NOT used in production vehicles is due to the Dealer network requesting that item. If it's not available it's because the dealers are not selling that item. If the dealers get requests then at some point the factory will make a run. Usually during the summer when tooling and vacations are occurring. Once production starts it's impossible to get press or foundry time for some special part. You could stand outside the foundry in Defiance Ohio with a bull horn! Best bet is to get as many people as possible to request the part from the dealer. That always works.