ARP Heads Bolts - Whats the difference?

Bruceynz

Bruceynz

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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
 
Bruceynz

Bruceynz

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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
 
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XfbodyX

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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?
 
Bruceynz

Bruceynz

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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.
 
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XfbodyX

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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.
 
Oldiron440

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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.
 
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