push rods
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push rods

  1. #1
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    Arrow push rods

    I plan on installing a set of
    Iron Eagle 308 heads on a 1999 502 cid 415 MPI engine, allso a set of comp. cam. roller rocker Arms. I would like to know if the push rods have to be changed.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    This may or may not be a lot of help Ken, but last spring I changed from stamped rockers to Comp Hy-Tech stainless steel roller rockers on my Mk-IV Chevy, and didn't have to change anything but the polylocks to the Comp locknuts (oh, and the studs to the longer (1.90") ARP studs). If the Iron Eagle heads won't force a pushrod change, I don't believe the rockers will. The heads are the risk point IMO.

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    steelcomp was here
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    Quote Originally Posted by SmokinLowriderSS View Post
    This may or may not be a lot of help Ken, but last spring I changed from stamped rockers to Comp Hy-Tech stainless steel roller rockers on my Mk-IV Chevy, and didn't have to change anything but the polylocks to the Comp locknuts (oh, and the studs to the longer (1.90") ARP studs). If the Iron Eagle heads won't force a pushrod change, I don't believe the rockers will. The heads are the risk point IMO.
    Changing rockers sbhouldn't require a pushrod cahnge, but changing heads, especially to an aftermarket head will most likely require different pushrods, if you want the geometry to be correct. If it's not, you may cost yourself a good percentage of the HP gain you were looking for (and paid for) by the head swap. It's easy to check proper geometry, so why not be sure?
    Now, go ahead and someone ask...what's right way to check PR geometry?
    That's a whole new thread.

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  6. #4
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    Arrow

    O K what is the right way to get the proper push rod geometry.

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  8. #6
    steelcomp was here
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    Quote Originally Posted by Fiat48 View Post
    Thanks Bob...that oughta keep him busy for a while.

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    Senior Member motormonkey's Avatar
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    Jim miller got it

  10. #8
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    Well after reading it all 2 or three times it all makes sense, kinda makes your head swim for a while though.

  11. #9
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    http://unix-scripts.com/hb/uploads/Lun1.JPG

    http://unix-scripts.com/hb/uploads/Lun2.JPG

    This is old and hard to find. I suggest you save it. Was written by Miller years ago.

  12. #10
    Gone in a Flash! Speed of Heat's Avatar
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    Fiat, Any chance you could repost that Lunati material as a pdf file. I'd like archive it for future use. I could'nt get it to format into a readable doc.

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    Nope cause I am not good enough. LOL. Maybe somebody is.
    But I did notice a couple things. In explorer....when the mouse is moved over the doc a magnify glass appears and you can blow it up.
    Also in Explorer....the option "tools" and select full screen helps.

    I was lucky to find it. I sent that to "Shaun" and he happened to keep that on his site. That is out of an old Lunati Catalog I have. I still use this method.
    Last edited by Fiat48; 01-05-2008 at 07:52 PM.

  14. #12
    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by Speed of Heat View Post
    Fiat, Any chance you could repost that Lunati material as a pdf file. I'd like archive it for future use. I could'nt get it to format into a readable doc.
    I left clicked on it like I wanted to print it and then a prompt came on the screen that said " enlarge to regular size".

    Sleeper CP
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  15. #13
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    It's a picture just click on it to enlarge it then right click and save it!..

  16. #14
    steelcomp was here
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    Quote Originally Posted by GoFastRacer View Post
    It's a picture just click on it to enlarge it then right click and save it!..
    I've tried everythig I know...can't even save it.

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