ARP Heads Bolts - Whats the difference?

Engines, Exhaust and Fuel Systems

  1. Bruceynz

    Bruceynz Well-Known Member

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    Hello,

    Does anyone know what the difference between the ARP 144-3604 and 144-3605 heads bolts are, they look the same to me, I have a set of 144-3604 and want to know if I can use them on Alloy heads, I have emailed ARP and have yet to get a reply.

    Thanks
    Bruce
     
  2. XfbodyX

    XfbodyX Well-Known Member

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  3. Bruceynz

    Bruceynz Well-Known Member

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    Here is a photo of same heads I have, Mopar P4532900, are you saying alloy heads use 3 different length bolts?

    alum heads 5.JPG alum heads 10.JPG alum heads 6.JPG
     
  4. XfbodyX

    XfbodyX Well-Known Member

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    Id toss it on your block and see if your oem bolts work as far as length, then you would know.

    Looks like they use two lengths. The center row would be where the height difference would be in the casting if any.

    Not a popular head really. How did you end up with them?
     
  5. Bruceynz

    Bruceynz Well-Known Member

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    so where the head bolts go through the center they bosses are higher on eddy alloy heads? (eddy heads below)

    upload_2019-2-12_8-18-58.png

    The ones on the MP heads look like they are machined the same as the iron heads, the eddy looks to be sitting up higher.
     
    Last edited: Feb 11, 2019
  6. XfbodyX

    XfbodyX Well-Known Member

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    Yep. eddy like heads have different heights, and so does oem heads like j heads. But eddly like heads take one more longer in the 10 total then the oem la heads. But none of that pertains to what your doing.

    Thats just an al. mag head, the 3604 PN is the same as your oem bolt length im almost sure. But since your so far away id double check with your oem bolts.
     
  7. Oldiron440

    Oldiron440 Well-Known Member

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    What motor are they for?
     
  8. Bruceynz

    Bruceynz Well-Known Member

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    Are you asking me? Magnum 360
     
  9. AJ/FormS

    AJ/FormS Well-Known Member

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    Hang on, will your exhaust fit on those heads? look how far apart the center two bolts are.

    Just curious; what do the chambers look like?
     
  10. Bruceynz

    Bruceynz Well-Known Member

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    I think the bolts are ok, this guy said he has machined the exhaust ports bigger from memory
     
  11. Oldiron440

    Oldiron440 Well-Known Member

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    I was asking what are you going to put them on?
     
  12. Bruceynz

    Bruceynz Well-Known Member

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    My 360 magum in my doba, will get the compression up!
     
  13. Oldiron440

    Oldiron440 Well-Known Member

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    Cool!
     
  14. Bruceynz

    Bruceynz Well-Known Member

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  15. Oldiron440

    Oldiron440 Well-Known Member

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    Make sure to pull them apart and check valve guides and valve seats along with valves, seats and valves for runout, guides for clearance.