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Thread: Pushrod length

  1. #1
    casual poster arronvl's Avatar
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    Default Pushrod length

    So I've made myself an adjustable pushrod and played around trying to achieve correct valvetrain geometry and pushrod length. As it turns out to have the rocker sweep centralized I'm in need of pushrods 8.950, some background info on the motor is the block has been decked to 5 thou above the piston - Scat crank with SRP forged chev pistons (The original engine numbers are long gone and re-stamped). The heads have been shimmed to achieve 11:1 comp, valve seats have also received a 3 angle grind. Cam is a H304 with all the recommended crane gear to suit. Rockers are scorpion 1.65:1 ratio
    the valve spring seats have shims as well (Cant remember off hand how thick)

    How does this sound to you guys

    Thanks in advance

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    Did you do a mid lift geometry setup?

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    Quote Originally Posted by Castiron355 View Post
    Did you do a mid lift geometry setup?
    I used this method

    https://www.youtube.com/watch?v=o5is9BsH5OU

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    If you followed that. Then you're on the money. That's actually a really good link.

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    Quote Originally Posted by Castiron355 View Post
    If you followed that. Then you're on the money. That's actually a really good link.

    Cheers Castiron355. This I all set up on the base circle of the cam to correct. Any suggestions on pushrod manufactures?

  6. #6
    Do you ever leave? EH179's Avatar
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    Trend, Crow cams, Lunati...heaps of suppliers out there.

    Just get the length, ball end and wall diameter right.. i would look at .060- .080 wall thickness on a 5/16" pushrod.

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    I ended up with Manley. Only because the length was right and on gumtree. .080 wall cromoly.

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    I went Trend. No issues.

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    both comp cams & crow, and I expect others get their pushrods from trend

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    That way was too complicated for me,marker on valve stem worked for me.

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    Quote Originally Posted by kiwiwalkinshaw View Post
    That way was too complicated for me,marker on valve stem worked for me.
    I use both, blue on valve tip last as insurance.
    Also good idea to check actual rocker ratio beforehand.

  12. #12
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    Would the base circle be the same on this hydraulic H304 cam be the same as F288-2?

    Thanks for the replies fellas.

  13. #13
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    Without having both cams side by side to measure, it would only be a guess by using Rocker/valve adjustment.

    If both were new billets from the same manufacturer, they should be similar.

  14. #14
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    Both crane cams, i have a solid 288 here as well Id like to put in if the power isnt where Id like and am wondering if I will be able to utilise the pushrods for that when the time comes

  15. #15
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    The 288 would be my choice in the first place for your engine...

    My gut feeling is you should be ok. A previous engine i changed a hyd' cam out for a solid 280 cam and used the same push rods, no problems.

    Give APD (Crane Cams Australia) a ring or an email, they may know more.

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