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Thread: 2.0 head on a 2.4

  1. #1

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    2.0 head on a 2.4

    I have access to a 2.0 out of an 88 ram 50. I'm thinking of building a new head for my truck. Would the 2.0 swap over or better to get another 2.4 head to build

  2. #2

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    It will fit but you'll have to do some porting to get it to flow enough to keep up with the larger block. The 2.0 intake ports are 3-4 mm smaller. Also it will raise compression around a point with stock pistons and gasket. I wouldn't bother unless you had a non-MCA jet 2.0 head and time to modify it.
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  3. #3

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    I have time... good winter project.
    Is there a hotter cam that anyone can suggest since I'm doing the swap?

  4. #4

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    What is an mca jet head? I think this engine had an air pump

  5. #5

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    MCA jets were a 3rd valve in the cylinder used in some carbed SOHC heads to induce swirl and a cleaner combustion. MCA jet heads are sometimes referred to as 12 valve heads. The majority of carbed trucks came with MCA jets. Fuel injected trucks didn't come with MCA jets because they weren't necessary any longer to pass emissions.

    MCA jet heads are generally seen as less desirable from a performance standpoint and they are more likely to crack the head if it overheats. But they're fine for every day driving and fuel economy.

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  6. #6

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    That 2.0 was a carb engine so it probably has that head.
    I'll look for another 2.4 head to work with

  7. #7

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    One other issue with the 2.0 head on the 2.4 is the fuel pump on the intake side of the head. The 2.4 uses an electric fuel pump for the EFI while the 2.0 uses a mechanical pump for the carb.

  8. #8

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    this head should work great for 400. one of my trucks has a forklift head on it, found it out when i went to swap the rocker arms out for manually adjusted ones. the forklift head uses cam bearings, the trucks do not. it runs better than my other two trucks and makes more power and oddly 3 more mpgs. if you ever find a forklift that someone is parting out, check to see if it has a 4g64. my dad used to own one but this was before i was a mm guy. they can be found in clarks and cats. they are propane to so might be a project. good luck.

    http://www.ebay.com/itm/4G64-8-VALVE...29dd51&vxp=mtr

  9. #9

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    Cam bearings huh?
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  10. #10

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    Don't all heads have cam bearings? If not...what does the journals run on?

  11. #11

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    Quote Originally Posted by Can1991Ram View Post
    Don't all heads have cam bearings? If not...what does the journals run on?
    Some heads have separate cam bearing shells that need to be installed as separate components in the cam caps and bed - most are machined journals that have been line bored through white metal which acts as the bearing surface.

  12. #12



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    We do have this thread that is similar. http://www.mightyram50.net/vbulletin...On-A-G54B-2-6L
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  13. #13

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    normally the head is made of aluminum and the cam is made of steel or something other than aluminum. different alloys make good bearings so it works out. there are reasons this method is not done with cranks but is common practice for cams.

  14. #14

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    That other thread is a 2.0 on a 2.6

  15. #15

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    Quote Originally Posted by Can1991Ram View Post
    That other thread is a 2.0 on a 2.6
    Astron 4G52 head on a 4G54 block (just clarifying y'know...)

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