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Looking for information on the performance potentials of these engines.
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Joined: Oct 2007
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"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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There is a lot of discussion and build threads about them HERE.
Class III CNC Machinist/Programmer
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The comp eliminator racers are making > 100hp/cylinder in NA form.
The engine can easily make 400HP turbo'ed and good fuel. What do you want to do with it?
The 2800 is the 4 cylinder version of the 4200 and uses common parts with the '02 to '05 4200 (except the cams and crank). The 2900/3700 got a bigger bore and uses the same valve train parts as the '06 up 4200 except for the camshafts.
To bad GM did go to the bigger bore on the 4200..
I recently got a 2900 donated to me..
Last edited by efi-diy; 01/27/16 10:25 PM.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Having a bigger bore allows the cylinder head to flow better. What could be wrong with the 4200 bore size?
12 port SDS EFI 
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I think he's just meaning in a generic manner that there is always room for improvement. However, Leo's new engine makes 1150 HP with a mild tune up, so I don't see anything wrong with the bore size up to this power level.
Class III CNC Machinist/Programmer
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I'm just wondering about a Colorado or what ever small 4X4 pickup with a 2800-2900 four. (odd #s of cylinders doesn't work for me) I don't know what Leo's new engine is. I'm not racing just trying to get home. The wife's 2014 Jeep just impressed the heck out of me with it's V-6 and "Trail Rated" electronic 4X4. It came up the 2 miles of snow over mud better than 1,500' of elevation in 2 miles as well as we have done in the past chained up on all 4 in older rigs. I'm wondering if a Colorado is worth thinking about or just stick the 292 in the old '70 blazer add deal with it. 
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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Leo has switched over to Atlas power with a 4200 in his Stude.
Class III CNC Machinist/Programmer
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Nothing wrong - just wishful thinking. When GM update the 2800/3500 they went to a bigger bore - 1 year after the 4200 got its mid-life upgrade.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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I'm pretty good at wishful thinking. It's actually doing things that challenges me.  
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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Tom, You would be surprised at what a 2900 will do.. add a freer flowing exhaust/cat delete & tune and I think you would really like it. You could find a 3 pedal 2900 colorado/canyon 4x4 with the Z71 option. I get around fine here with my 2wd with posi and good snow tires no problem. I'm just wondering about a Colorado or what ever small 4X4 pickup with a 2800-2900 four. (odd #s of cylinders doesn't work for me) I don't know what Leo's new engine is. I'm not racing just trying to get home. The wife's 2014 Jeep just impressed the heck out of me with it's V-6 and "Trail Rated" electronic 4X4. It came up the 2 miles of snow over mud better than 1,500' of elevation in 2 miles as well as we have done in the past chained up on all 4 in older rigs. I'm wondering if a Colorado is worth thinking about or just stick the 292 in the old '70 blazer add deal with it.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Joined: Oct 2007
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I need to find one on a car lot and take a test drive.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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I had an 04 4cyl colorado with a 5 speed and it moved just fine. And I drove it in the mountains a lot. I think it would be lots of fun with a turbo on it.
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