Couldn't I just get a 6.1 short block, and outfit it with all the 5.7 accessories? - Hemi Truck Club
 
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Old 06-19-2018, 03:14 PM   #1
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Question Couldn't I just get a 6.1 short block, and outfit it with all the 5.7 accessories?

I was just looking at the 6.1 short block, and the 5.7 short block, and everything looks about the same. The 6.1 is missing a few bolt holes on the block, but nothing that appears to matter. I have seen people put 6.1 heads, timing set, oil pumps, push rods, lifters, crank, fuel injectors, and intakes on a 5.7 block. So couldn't I just get a 6.1 short block, and outfit it with all the 5.7 accessories? For example I bought a 6.1, and then get the Edelbrock heads 61119, or have mine sent out. The comp cam 268, and then just put everything else on the 5.7 on the 6.1 with whatever adapter I would need to make the 5.7 flywheel work on the 6.1 crank.


Am I missing something that wouldn't make this work?

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Old 06-19-2018, 03:20 PM   #2
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I was just looking at the 6.1 short block, and the 5.7 short block, and everything looks about the same. The 6.1 is missing a few bolt holes on the block, but nothing that appears to matter. I have seen people put 6.1 heads, timing set, oil pumps, push rods, lifters, crank, fuel injectors, and intakes on a 5.7 block. So couldn't I just get a 6.1 short block, and outfit it with all the 5.7 accessories? For example I bought a 6.1, and then get the Edelbrock heads 61119, or have mine sent out. The comp cam 268, and then just put everything else on the 5.7 on the 6.1 with whatever adapter I would need to make the 5.7 flywheel work on the 6.1 crank.


Am I missing something that wouldn't make this work?
yes you can do exactly what you are talking about. there is no adapter necessary for the flywheel I have a 6.1 crank in my 5.7 block it just needs to be balanced...
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Old 06-19-2018, 03:34 PM   #3
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Are you talking about an internal/external balance like on the old 318/360's, or or is it just weight differences between the rotating assemblies?
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Old 06-19-2018, 03:37 PM   #4
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The only thing is you have to use the relucter wheel that matches your pcm. What year truck do you have? Different year heads have different size chambers which need to match the pistons to determine compression ratio.
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Old 06-19-2018, 03:43 PM   #5
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It's my 2003 QC 2wd that I had asked about needing to swap the computer. Which I am going to do swap the 2003 to the 2005 ECM. I am not looking for a lot of horsepower as I am going keep my 545. All I was looking for is a little kick in the pants, and I am figuring if I do the 456 gear with a rebuild; it should work for what I am looking for.
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Old 06-19-2018, 03:49 PM   #6
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when you do the PCM change make sure that you remember to do a relearn for your transmission...
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Old 06-19-2018, 03:51 PM   #7
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Quote:
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Are you talking about an internal/external balance like on the old 318/360's, or or is it just weight differences between the rotating assemblies?
yes you will need the correct reluctor wheel... you won't need to have it balanced you're going to use a complete short block correct...
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Old 06-19-2018, 03:52 PM   #8
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Thanks for the heads up. I wasn't sure I was going need to do a relearn . What do I need to relearn the transmission?
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Old 06-19-2018, 04:06 PM   #9
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The 6.1 block is the most similar to the 5.7 not having mds and vvt. Shares the same crank swing with a larger bore. Typically a 5.7 block is about half of what a 6.1 block will cost. 5.7 with a big stroker kit will get you 418 I believe and a 6.1 with a big stroker will yield 440.
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Old 06-19-2018, 04:17 PM   #10
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Without stroking, or running a running a supercharger what would be the best to get about 450 HP at the crank? I'm thinking with the Edelbrock heads, Comps 268, a set of Kooks long tube, and tune on the engine would get me close.

I went to a local machine shop a couple of years ago looking for a goal of 450 HP at the crank. They told me the only the 5.7 would do that is with a stroker kit. Which didn't seem right to me as the 5.7 already sets at 345 stock. Here I am thinking that a good head job, and a cam I should get close.

This is why I am thinking about just getting the 6.1.
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