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  1. #1

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    4-tec ARP Rod bolts - Anyone able to use them?

    Got a set of 4tec ARP Rod bolts a while back, and as has been mentioned before, and is seen in the pics, they have a taller head than the oem bolts, and because of this, they stick out too far, and hit the bottom of the case when assembled.

    Does anyone use these? If so, did you cut a groove for them in the bottom case? OR did you cut down the head on the bolt?


  2. #2
    Site Admin Green Hulk's Avatar
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    Only the two very front studs hit under the valve cover.

    Take a dremel and clearance out the valve cover where these two front studs hit and you will be fine.

  3. #3

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    Valve cover? You mean lower case, right? I noticed that that seemed to be the case also. As there were only marks on the 3rd cyl. Thanks for the info!

  4. #4
    dhoad's Avatar
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    I use them and had to clearance the cases to make them fit properly, however I switched to a set of 04 cases and they have a larger space for the throw of the crank and the bolts don't have the clearnace issue.
    I used a dremel tool on my 05 cases to make room for the ARPs though with no issues

  5. #5

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    I thought I remembered someone saying something about different year blocks having clearance for them, where other years didn't. Thanks for the info Dr. I'll just hold onto them for use in another build then, prefer not to modify a block unless I absolutely have too.

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by boostaholic View Post
    Valve cover? You mean lower case, right? I noticed that that seemed to be the case also. As there were only marks on the 3rd cyl. Thanks for the info!
    Chris, please disregard my post. I had my mind on ARP head studs. Sorry for the confusion

  7. #7
    rxpredviper's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Only the two very front studs hit under the valve cover.

    Take a dremel and clearance out the valve cover where these two front studs hit and you will be fine.
    +1 true i have my the same way

  8. #8
    dhoad's Avatar
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    Quote Originally Posted by boostaholic View Post
    I thought I remembered someone saying something about different year blocks having clearance for them, where other years didn't. Thanks for the info Dr. I'll just hold onto them for use in another build then, prefer not to modify a block unless I absolutely have too.
    I don't know this but I would guess all pre 05 cases have the same casting.
    I will look into things and see if I can get you an answer
    hold on a second, you have more parts than anybody I know so you must have some 04 and older blocks, lol

  9. #9

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    Quote Originally Posted by dhoad View Post
    I don't know this but I would guess all pre 05 cases have the same casting.
    I will look into things and see if I can get you an answer
    hold on a second, you have more parts than anybody I know so you must have some 04 and older blocks, lol
    Hahaha, Touché The block I'm assembling at the moment doesn't have a plate on it, and I can't find a date casting mark. But I think I have an 02, and 05 block as well at the moment. As I assemble them, I'll check the date, and try the ARP rod bolts on each and report back with what I find out.

    Thanks for the advice & help as always guys!

  10. #10
    Quote Originally Posted by boostaholic View Post
    Got a set of 4tec ARP Rod bolts a while back, and as has been mentioned before, and is seen in the pics, they have a taller head than the oem bolts, and because of this, they stick out too far, and hit the bottom of the case when assembled.

    Does anyone use these? If so, did you cut a groove for them in the bottom case? OR did you cut down the head on the bolt?
    I learned the hard way that they don't fit the crank would only turn 1/2 revolution.

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