2020 Chevy 2500HD 6.6 Gaseser data.

ksss 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.

This motor is not going to overheat. Comparing the small block 400 to the 6.6 siamesed cylinders or not is ridiculous, sorry but it is. The 6.6 will replace the 6.0 and so the shoes to fill are huge, and GM is certainly aware of that. They are not going to release this motor that has been years in the making, and be used in HD pickups if it overheats. It will be dialed in and ready to pickup where the 6.0 leaves off.

I am guessing if your condemning a motor that has not even hit the ground yet, by comparing it to one built 40 years ago, your really not in the market anyway.

Also the cooling jackets between the cylinders are connected. It will be fine, it is nothing like a 400. I do find the high pressure full pump interesting as it is mechanical.

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.

This motor is not going to overheat. Comparing the small block 400 to the 6.6 siamesed cylinders or not is ridiculous, sorry but it is. The 6.6 will replace the 6.0 and so the shoes to fill are huge, and GM is certainly aware of that. They are not going to release this motor that has been years in the making, and be used in HD pickups if it overheats. It will be dialed in and ready to pickup where the 6.0 leaves off.

I am guessing if your condemning a motor that has not even hit the ground yet, by comparing it to one built 40 years ago, your really not in the market anyway.

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.

The LS7, the C5Rs (24 hours of Daytona Winner), and the performance LSX bowtie block used in tons of race applications all have siamesed cylinders. They don't have the issues of the 400. This isn't 1985. :)

KW/00 I follow your thoughts. Only two of us and we tow what fits us comfortably.
Both financially and mechanical wise!
Had a diesel but didn't really need it. Liked it, but didn't really need it.
I am so amazed what all trucks have evolved into. I love this time and age.
Can't believe the thinking, amount of money and busted knuckles to get where in time we are now!
400 hp and a six speed transmission! I would have NEVER thought that was even in the cards when we started pulling trailers in the early nineties, let alone the comfort of vehicle and camper that is available today!
My trailer is 13 years old and we are Very comfortable in it. My truck is 7 years old and seems Old compared to today's market!

Can you explain the term siamesed cylinders,TY.

Can you explain the term siamesed cylinders,TY.

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.

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 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.