The whole video discusses the Duramax and chassis as well.But the beginning discusses the new 6.6 which I am interested in it to replace my 6.0 gasser. I don't really need a diesel and only use my trucks to tow. 2020 GM 2500HDI like the stainless steel exhaust manifolds. I can't think of any other gasser with that from the factory. Should be helpful with heat cycles.I wish it looked better not a fan of the looks, but I like the sound of the drivetrain.

I think it will be a good engine for sure. I don’t like the new Chevy look of the 2500 but the gmc version looks nice. With Ford releasing the 7.3 and GM releasing the 6.6, gas trucks will sell more in my opinion. All though I’ve always felt the current gas offerings are worth it and more then capable of pulling loads. Their so reliable now and really have been for years. We pull with gas and diesel and to be honest, diesel has an edge on pulling and staying in gears in the hills but only because it’s got a huge turbo. But for me gas does everything I need it to do, without regen or dpf or any other emissions issues that we have had with the diesel version. With newer and larger displacements of gas engine offerings, I will stay with gas and I’m sure several fleets across the country will do the same.

I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

Jayco23FB wrote:I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.I would assume that with the advanced CAD modeling they can do these days that it wouldn’t be an issue. I could be wrong.

Can you explain the term siamesed cylinders,TY.

2020 Chevy 2500HD 6.6 Gaseser data. | Good Sam Community

ksss
Explorer
Apr 22, 2019
mtofell1 wrote:
My only request is that manufacturers stop sizing engines the same as one of their past engines so we all know what is being referred to.

Old Ford 7.3 diesel - New Ford 7.3 gas
Old Chevy/GMC Duramax 6.6 - New Chevy/GMC 6.6 gas

Message boards are going to be full of confusion for the next 20 years.

Of course, I know the manufacturers have more to worry about than message boards but it is kind of funny they do this. You have to figure there will be plenty of confusion when various people are talking about the engines.

I thought the same thing.
mtofell1
Explorer
Apr 21, 2019
My only request is that manufacturers stop sizing engines the same as one of their past engines so we all know what is being referred to.

Old Ford 7.3 diesel - New Ford 7.3 gas
Old Chevy/GMC Duramax 6.6 - New Chevy/GMC 6.6 gas

Message boards are going to be full of confusion for the next 20 years.

Of course, I know the manufacturers have more to worry about than message boards but it is kind of funny they do this. You have to figure there will be plenty of confusion when various people are talking about the engines.
dodge_guy
Explorer II
Apr 21, 2019
ls1mike wrote:
SoonerWing03 wrote:
Any guesses as to the expected fuel economy for this engine?

Bad? Probably not much different than the current 6.0 15ish empty 7-9ish towing.
I know it matters to some who daily drive it, but I am not buying a tow vehicle for MPGs and I don't daily drive my truck.

How is that bad for a towing motor? Sounds like it is going to be better all sound. All 3 manuf are going to new bigger gas motors, which tells a lot about the future of diesel! The diesel has been milked for all it can....to the point they can’t get them to pass emissions without playing with the software!
Huntindog
Explorer
Apr 21, 2019
Lessmore wrote:
Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

Pretty sure hot rodders had found a fix for this by the late '90's.
Yes they did, it was a 383.
Lessmore
Explorer II
Apr 21, 2019
Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

Pretty sure hot rodders had found a fix for this by the late '90's.
Jayco23FB
Explorer
Apr 21, 2019
I
RCMAN46
Explorer
Apr 20, 2019
In today’s engines siamesed cylinders should not be a problem.

Even the all mighty 6.7 Cummins has siamesed cylinders.
ls1mike
Explorer II
Apr 20, 2019
SoonerWing03 wrote:
Any guesses as to the expected fuel economy for this engine?

Bad? Probably not much different than the current 6.0 15ish empty 7-9ish towing.
I know it matters to some who daily drive it, but I am not buying a tow vehicle for MPGs and I don't daily drive my truck.
SoonerWing03
Explorer
Apr 20, 2019
Any guesses as to the expected fuel economy for this engine?
ls1mike
Explorer II
Apr 20, 2019
SARGUY wrote:
Can you explain the term siamesed cylinders,TY.

the cylinders have no way for coolant to flow between them.

This engine is siamesed but allows for coolant to flow between them.

It just increases the strength of the block overall.