can anyone in sac walk me through pushrod length??
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can anyone in sac walk me through pushrod length??

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    Senior Member matt1840's Avatar
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    Default can anyone in sac walk me through pushrod length??

    I used my old pushrods out of the 455 and everything looksto be ok, but considering i went to a larger cam, and roller rockers, new studs and guideplates i just wanna make sure i have the correct length rods. I dont wanna re assemble this thing and have a ticking time bomb ive got alota money wrapped up in my engine.

    Anyone willing to come by after i get my adjustable rod and kinda walk me through the process?? I think i can figure it out but like i said about the bomb thing


    ive got plenty of beer lol.

    Oh and from what im understanding since ive got hydrolic lifters, i should use a solid lifter to check the length?? this is where im kinda lost with this whole thing.

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    i can give you a hand. Im not a 455 guru but im sure we could swing that. My number is 916-753-0462,

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by matt1840 View Post
    I used my old pushrods out of the 455 and everything looksto be ok, but considering i went to a larger cam, and roller rockers, new studs and guideplates i just wanna make sure i have the correct length rods. I dont wanna re assemble this thing and have a ticking time bomb ive got alota money wrapped up in my engine.

    Anyone willing to come by after i get my adjustable rod and kinda walk me through the process?? I think i can figure it out but like i said about the bomb thing


    ive got plenty of beer lol.

    Oh and from what im understanding since ive got hydrolic lifters, i should use a solid lifter to check the length?? this is where im kinda lost with this whole thing.
    I have used an oil primer pump with some success, seems more "real", just another opinion...

    GT

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by justjosh View Post
    i can give you a hand. Im not a 455 guru but im sure we could swing that. My number is 916-753-0462,
    no need to be a 455 guru, im pretty sure finding the correct length rod is pretty much same on eny engine. thanks for the help ill be sure to contact you when i get the correct tools in the mail.

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    if your waiting on mesuring tools i have a 24" caliper i can bring if needed.

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    Cas
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    Matt,
    Here's a link to the Comp Cams webpage on how to set-up the valve train geometry-
    http://www.compcams.com/information/Products/Pushrods/

    To figure out the length you need, you will need a solid roller lifter and an adjustable pushrod. Put the solid lifter in the bore and put the rest of the valve together using the adjustable pushrod. Use the diagram on the above link for reference to determine the length you need.
    The solid lifter is used only because the hydraulic lifter may compress giving you a false reading.
    Also, it's best to measure all 16 as it's possible for a variance in lengths.
    Last edited by Cas; 09-30-2008 at 09:20 PM.

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    Senior Member cruzer's Avatar
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    Not a guru either but, why do you need a differnt length push rod. Unless you are changing the lifters to different length ones or the new cam has a different size base circle or the push rod were incorrect before the rebuild, the old ones should be just fine. Are you just measuring to make sure(not a bad idea)? A new cam with different lift specs does not mean you have to change the push rods (assuming the rods were correct before the cam change)
    Cruzer
    21 Eliminator Daytona. Blown 540

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by cruzer View Post
    Not a guru either but, why do you need a differnt length push rod. Unless you are changing the lifters to different length ones or the new cam has a different size base circle or the push rod were incorrect before the rebuild, the old ones should be just fine. Are you just measuring to make sure(not a bad idea)? A new cam with different lift specs does not mean you have to change the push rods (assuming the rods were correct before the cam change)
    well its a new fresh motor ive got alot of money in so why skimp on doing something correct?? and secondly before the motor had an aftermarket cam which i dont know what it was. So i dunno what the base circle was to begin with.. Not to mention its always best to learn something new so i can just do it myself when i start my bbc build. I know my way around an engine farily well and have built several, just always threw stock pushrods back in it and everything has always been fine, id just like to really do this one correctly considering ive done everything else possible to this motor.

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    Senior Member cruzer's Avatar
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    Not bashing just asking why you want to check. Checking just for the sake of being sure is a good enough reason for me. I will probably check this myself when I do my next rebuild even if I "know" that it isn't needed.
    Cruzer
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    Cas
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    Quote Originally Posted by matt1840 View Post
    well its a new fresh motor ive got alot of money in so why skimp on doing something correct?? and secondly before the motor had an aftermarket cam which i dont know what it was. So i dunno what the base circle was to begin with.. Not to mention its always best to learn something new so i can just do it myself when i start my bbc build. I know my way around an engine farily well and have built several, just always threw stock pushrods back in it and everything has always been fine, id just like to really do this one correctly considering ive done everything else possible to this motor.
    Since you're going with a larger cam and roller lifters, you're doing the right thing by checking....better safe than sorry especially with the valve train

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Cas View Post
    Since you're going with a larger cam and roller lifters, you're doing the right thing by checking....better safe than sorry especially with the valve train

    no roller lifters, just larger ratio roller rockers. Like i said it may not be needed, but with new studs, rockers and larger cam id like to check.. The major thing im thinking is with the new studs what if the rockers sits closer or farther away from the surface of the head??? That would make some difference or so i think...
    Last edited by matt1840; 10-01-2008 at 01:12 PM.

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    Senior Member H20MOFO's Avatar
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    FWIW On my olds I switched it over to an adjustable rocker set up.
    Another Hot Boat refugee

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by H20MOFO View Post
    FWIW On my olds I switched it over to an adjustable rocker set up.
    most deffinetly, ive got the entire harland sharp setup forged internals, race prepped block, studded bottom end, oil drainbacks to the pan from rear of heads, Pretty agressive cam, it should be a well built motor.

    "if your waiting on mesuring tools i have a 24" caliper i can bring if needed."

    Josh you the man!

    excuse the cellphone pictures lol



    Last edited by matt1840; 10-01-2008 at 04:42 PM.

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    thats a pretty sick looking olds ya got there. what kinda hp are you shooting for. are you going to dyno the motor?

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