pushrod order.....
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pushrod order.....

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    Senior Member matt1840's Avatar
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    Default Before ordering pushrods...... OPINIONS!!!

    so im about to order pushrods since i got some extra cash and i have a question...


    I used converted stock hydrolic lifters to solids by filling them with jb weld to measure the length.. They are off by .006 from the hydrolic lifters im using from comp cams. My pushrod measured out to be 9.900 adding the .025 for preload and the .006 for the difference in the lifter i come up with 9.931... Considering they dont made rods in the length should i bump it up to a 9.950 or drop them down to a 9.900. Either way im going to lose geometry and gain or lose some lift.

    Any opinions before i order???
    Last edited by matt1840; 07-18-2009 at 03:20 PM. Reason: changed title

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    Default Stockers

    Quote Originally Posted by matt1840 View Post
    so im about to order pushrods since i got some extra cash and i have a question...


    I used converted stock hydrolic lifters to solids by filling them with jb weld to measure the length.. They are off by .006 from the hydrolic lifters im using from comp cams. My pushrod measured out to be 9.900 adding the .025 for preload and the .006 for the difference in the lifter i come up with 9.931... Considering they dont made rods in the length should i bump it up to a 9.950 or drop them down to a 9.900. Either way im going to lose geometry and gain or lose some lift.

    Any opinions before i order???

    Just get stockers for a hyd cam unless you have some sort of aftermarket heads/valve length difference. GM heads, stock valve height, hyd cam= stock push rod length....Ray
    LOUD BOATS SAVE LIVES

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Moneypit View Post
    Just get stockers for a hyd cam unless you have some sort of aftermarket heads/valve length difference. GM heads, stock valve height, hyd cam= stock push rod length....Ray
    The stock pushrods are way to short.. I changed over to harland sharp 1.6 rockers, and screw in studs. The stock rods allow the rocker to sit on the stud base, not to mention the rods dont even come into contact with the rockers till about 1/4 lift.

    Longer rods are deffinetly needed for proper geometry and valvetrain operation.

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    Quote Originally Posted by matt1840 View Post
    The stock pushrods are way to short.. I changed over to harland sharp 1.6 rockers, and screw in studs. The stock rods allow the rocker to sit on the stud base, not to mention the rods dont even come into contact with the rockers till about 1/4 lift.

    Longer rods are deffinetly needed for proper geometry and valvetrain operation.

    Is that all you changed? Why the 1.6 if I might ask? Most aftermarket manufacturers stress that stock components will work with their product. I am not familiar with the H/S rockers and studs. Crower rockers on 990s use the standard stuff, as do Crane Golds..........Ray
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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Moneypit View Post
    Is that all you changed? Why the 1.6 if I might ask? Most aftermarket manufacturers stress that stock components will work with their product. I am not familiar with the H/S rockers and studs. Crower rockers on 990s use the standard stuff, as do Crane Golds..........Ray
    I got a really good deal on the harlands and the 1.6 ratio is all they make for the olds. I wanted to upgrade the valvetrain from stock. With my cam choice i had to upgrade springs, change to screw in studs add guideplates and comp highly suggested an adjustable valvetrain. So i went with that i had. Considering i got the HS rockers for $150 brand new i took em.

    The cam i chose is the comp xe274h
    int .520 exh .523 lift
    .230/.236 @ .050
    110 lobe sep.

    Its supposed to be real strong in the mid range which is where i usually cruise.

    As for the pushrods no option if i should just jump to the 9.950??? Harland sharp doesnt suggest anymore than .025 of preload otherwise id just add .050 for it.
    Last edited by matt1840; 07-18-2009 at 04:57 PM.

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    Sit N' Spin Jetaholic's Avatar
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    My build with Performer RPM heads needed pushrods that were 0.050" shorter than stock. However, the block was decked 0.010", and 0.005" were taken off the heads when they were resurfaced.

    Not sure what the pushrod seat height is on the lifters, but they are the Comp Cams Pro Magnum hydraulic lifters so if anyone has that spec for them please post it up. The rockers are Scorpion rollers.

    I figured with aftermarket heads, rockers, pushrods and cam along with the block decking and head resurfacing plus the fact that I'm running aftermarket lifters probably was the cause for this. Not sure if the base circle of the cam lobes is the same size or larger than stock, but a larger base circle and/or lifters with a taller lifter bottom - pushrod seat height would also cause this.
    Last edited by Jetaholic; 07-18-2009 at 04:55 PM.



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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Jetaholic View Post
    My build with Performer RPM heads needed pushrods that were 0.050" shorter than stock. However, the block was decked 0.010", and 0.005" were taken off the heads when they were resurfaced.

    Not sure what the pushrod seat height is on the lifters, but they are the Comp Cams Pro Magnum hydraulic lifters so if anyone has that spec for them please post it up. The rockers are Scorpion rollers.

    I figured with aftermarket heads, rockers, pushrods and cam along with the block decking and head resurfacing plus the fact that I'm running aftermarket lifters probably was the cause for this. Not sure if the base circle of the cam lobes is the same size or larger than stock, but a larger base circle and/or lifters with a taller lifter bottom - pushrod seat height would also cause this.

    the stock 455 lifters are .291 from top of lifter body to bottom of cup and the comp cams lifters are .253 from top to bottom of cup. Right off the bat im gonna need shorter rods... BUT thats if i was using the stock rockers. The HS 1.6 rockers sit higher thus changing my rod length even more.

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    Default Olds, duh....

    OK, that explains a lot. An Olds..........You failed to mention Olds in your first post............Ray
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    Senior Member matt1840's Avatar
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    Quote Originally Posted by Moneypit View Post
    OK, that explains a lot. An Olds..........You failed to mention Olds in your first post............Ray

    nothing wrong with these engines as long as the main problem is taken into consideration..

    Im not out racing this boat like the rest of you guys this is a weekend warrior, 461 olds with all the bells n whistles lol.

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    Boat Nut sleekcrafter's Avatar
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    Smith Brothers will make the exactly the length your looking for, no in between guessing.
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    steelcomp was here
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    Quote Originally Posted by matt1840 View Post
    the stock 455 lifters are .291 from top of lifter body to bottom of cup and the comp cams lifters are .253 from top to bottom of cup. Right off the bat im gonna need shorter rods... BUT thats if i was using the stock rockers. The HS 1.6 rockers sit higher thus changing my rod length even more.
    Your measurement will only work if the overall length of the lifters are the same...the critical dimension is from the face of the lifter (that rides on the cam) to the bottom of the cup. If the overall length of the lifters is different, it makes no difference what the distance form the top of the lifter to the cup is.
    Last edited by scott foxwell; 07-18-2009 at 08:42 PM.
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  14. #12
    steelcomp was here
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    Quote Originally Posted by Moneypit View Post
    Just get stockers for a hyd cam unless you have some sort of aftermarket heads/valve length difference. GM heads, stock valve height, hyd cam= stock push rod length....Ray
    Unless the valve job is sunk, the heads have been milled, and/or the decks cut.
    If God is your co-pilot, change seats!
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    Senior Member matt1840's Avatar
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    Quote Originally Posted by steelcomp View Post
    Your measurement will only work if the overall length of the lifters are the same...the critical dimension is from the face of the lifter (that rides on the cam) to the bottom of the cup. If the overall length of the lifters is different, it makes no difference what the distance form the top of the lifter to the cup is.
    Both lifters (the new comp and the stocker) are the same overall length.. And not that i think of it you are correct in what your saying.. I was more worried about the cup depth than the overall. Good call on that.

    Both lifters are 2.000 so just do the math jetaholic. These are same size as chevy bbc lifters as well according to summit racing. Considering i can order rods in .010 increments im going to doble check my measurements and see about pricing on these rods.. They are 5/16 i believe and ball end.

    Steelcomp where do you get the rods from??? Im not needing "high performance" unless you feel that length will be prone to bending at high rpm... I was just gonna order the comp cam rods until i realised they didnt sell in the right length... GRRR another wall lol nothin can be easy with this engine lol
    Last edited by matt1840; 07-18-2009 at 10:21 PM.

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    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by matt1840 View Post
    Both lifters (the new comp and the stocker) are the same overall length.. And not that i think of it you are correct in what your saying.. I was more worried about the cup depth than the overall. Good call on that.

    Both lifters are 2.000 so just do the math jetaholic. These are same size as chevy bbc lifters as well according to summit racing.
    I'll look into that. I don't trust Summit's tech help line. Had a friend that bought a bigger cam kit (I think it was for a .550 lift or somewhere around there) for a Ford 460, and Summit told him that even with the stiffer springs and higher lift that all the stock rockers and pushrods were compatible with the cam kit! Needless to say, he bent a couple pushrods and lost a couple lifters.

    Always better to go with info direct from the manufacturer rather than the supplier.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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