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Pushrod Length?

This is a discussion on Pushrod Length? within the Internal Engine forums, part of the LSx Technical Help Section category; Just got a comp cam and valve springs for my 2000 Z28, Advertised Duration 265/ 271, Lift .558/ .563. Wondering ...

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    Burgandy
    2000 Camaro Z28

    Pushrod Length?

    Just got a comp cam and valve springs for my 2000 Z28, Advertised Duration 265/ 271, Lift .558/ .563. Wondering if any one has installed a similar cam or if anyone knows if i will need different then stock length pushrods.

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    Senior Member Wheeler99WS6's Avatar
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    that is the biggest duration for an LS1 cam I have seen so far.....as far as your question.....well I honestly dont know. Sorry I just wanted express my amazement on the size of the cam, its huge.

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    Pathelogical Liar BlackLT1Z28's Avatar
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    That's because those are the advertised duration numbers. You may be thinking of the aftermarket duration numbers @.050" lift. Advertised duration is understood to measure the duration @.006" lift. So, the duration numbers @.050" are smaller numerically.

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    Quote Originally Posted by Wheeler99WS6 View Post
    that is the biggest duration for an LS1 cam I have seen so far.....as far as your question.....well I honestly dont know. Sorry I just wanted express my amazement on the size of the cam, its huge.
    actually its relatively small... advertised duration is different.

    for example this high lift comp cam...

    Cam Style: Hydraulic roller tappet
    Basic Operating RPM Range: 2,200-7,400 RPM
    Intake Duration at 050 inch Lift: 228
    Exhaust Duration at 050 inch Lift: 230
    Duration at 050 inch Lift: 228 int./230 exh.
    Advertised Intake Duration: 281
    Advertised Exhaust Duration: 283
    Advertised Duration: 281 int./283 exh.
    Intake Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.573 in.
    Valve Lift with Factory Rocker Arm Ratio: 0.571 int./0.573 exh. lift
    Lobe Separation (degrees): 112
    Intake Valve Lash: 0.000 in.
    Exhaust Valve Lash: 0.000 in.
    Computer Controlled Compatible: No
    Grind Number: XR281HR
    Quantity: Sold individually.

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Quote Originally Posted by BlackLT1Z28 View Post
    That's because those are the advertised duration numbers. You may be thinking of the aftermarket duration numbers @.050" lift. Advertised duration is understood to measure the duration @.006" lift. So, the duration numbers @.050" are smaller numerically.
    damnit! you stole my thunder while i was looking for an example lol

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Quote Originally Posted by Pickupman404 View Post
    Just got a comp cam and valve springs for my 2000 Z28, Advertised Duration 265/ 271, Lift .558/ .563. Wondering if any one has installed a similar cam or if anyone knows if i will need different then stock length pushrods.
    use a stock length chrome moly pushrod and you will be fine. you can get good deals on them on ebay.

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    Pathelogical Liar BlackLT1Z28's Avatar
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    Quote Originally Posted by juiced99ws6 View Post
    damnit! you stole my thunder while i was looking for an example lol
    Sorry, but I'm too lazy to look for examples.

    And keep in mind that there is no direct relationship between advertised and aftermarket duration values. So, not all cams with a 283 advertised duration will have an aftermarket duration of 230. It also depends on the ramp rate. Just thought I'd throw that out there.

    As far as the pushrods, make sure you get hardened pushrods as preventative maintance from bent or snapped ones.
    Last edited by BlackLT1Z28; 02-27-2007 at 05:26 PM.

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    Slow'er'Ass Mr. Luos's Avatar
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    Running stock lifters??

    Base circle of the new cam is most likely a little smaller than the stocker.
    Either 7.400" (stock'ish') or 7.425" pushrods.
    Do hardened regardless.
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    Senior Member Wheeler99WS6's Avatar
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    Quote Originally Posted by BlackLT1Z28 View Post
    That's because those are the advertised duration numbers. You may be thinking of the aftermarket duration numbers @.050" lift. Advertised duration is understood to measure the duration @.006" lift. So, the duration numbers @.050" are smaller numerically.
    Well that makes me feel stupid.....didnt even realize he was talking about the Advertised duration I was assuming it was @.050"......sorry fellas

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    eh we knew you were prone to making mistakes.. You did shell out the cash for a roush!!! just messing with ya

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    Senior Member Wheeler99WS6's Avatar
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    black, 05 Roush
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    Quote Originally Posted by juiced99ws6 View Post
    eh we knew you were prone to making mistakes.. You did shell out the cash for a roush!!! just messing with ya
    Damn that is kinda true, it is a dog if you think about it, acceleration sux. I kinda thought it would be quicker than it is considering I paid $40,800 for it. Hey anybody want to buy it?

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Quote Originally Posted by Wheeler99WS6 View Post
    Damn that is kinda true, it is a dog if you think about it, acceleration sux. I kinda thought it would be quicker than it is considering I paid $40,800 for it. Hey anybody want to buy it?

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    Ha, you should have got an 03-04 Cobra.
    Those Roush chargers are terrible.

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    Advertised on mine is only 297/306.

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    Pathelogical Liar BlackLT1Z28's Avatar
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    What do you mean 'ONLY'?

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    Slow'er'Ass Mr. Luos's Avatar
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    It is a baby cam.

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    Junior Member greenvilleTA's Avatar
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    When I put in a TR 230/224 575/563 110 lsa, I used some 7.400 hardened pushrods by TR and they worked fine---stock ls1 block and heads. When I built my 383 using a 2006 LSX block, patriot S2 heads, and a comp 232/234 595/598 112 lsa, I had to get 7.475s. What I'm trying to say is, depends on your overall application and set up. Pushrod length checker is $20 and money well spent. Just a little too short and it will sound worse than a sewing machine.
    Just my $.02 though
    4" Stroker Crank/4340 H Beam Rods/Forged Pistons/File to fit Plasma Moly Rings/Patriot S2 LS6 heads/Harland Sharp rockers/SLP Lid/Smooth Bellowes/Comp 232/234 595/598 112 lsa/chrome-moly push rods/LS1 Edit/LS6 intake/Spec3 clutch/Fidenza aluminum flywheel/4.10s/MAC mid-lengths/MAC ORY/SLP catback

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    Pathelogical Liar BlackLT1Z28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    It is a baby cam.
    Haha, yeah right, I forgot. That's why you need a smaller cam for emissions.

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    Just a little smaller.

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    Pffft. Just the difference in the cam specs could create a new cam.

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