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HEMI Tech- Rockers, valves, pushrods, springs

Discussion in 'The Hokey Ass Message Board' started by scootermcrad, Jul 5, 2006.

  1. DDDenny
    Joined: Feb 6, 2015
    Posts: 13,713

    DDDenny
    Member
    from oregon

    And like Joe Friday on Dragnet always said "just the facts ma'am".
    You won't get b.s. or speculation from racer-x.
    Good luck Brian.

     
    racer-x likes this.
  2. paul philliup
    Joined: Oct 3, 2013
    Posts: 186

    paul philliup
    Member
    from ohio

    Yes
     
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  3. Mick Coyne
    Joined: Aug 12, 2008
    Posts: 510

    Mick Coyne
    Member

    Racer-x, I should have kept my old 392... Hemi stuff 7.jpg Hemi stuff 4.jpg
    Mick
     
    INVISIBLEKID and racer-x like this.
  4. jimpopper
    Joined: Feb 3, 2013
    Posts: 99

    jimpopper
    Member

    Didn't see any reference on this but what's the ideal clearance between the rocker bore and the shaft? I am working on a 325 dodge using a cam re-ground by racer brown.
     
    Last edited: Feb 13, 2020
    loudbang likes this.
  5. desoto
    Joined: Mar 23, 2001
    Posts: 715

    desoto
    ALLIANCE MEMBER
    from Ayer, MA
    1. MASSACHUSETTS HAMB
    2. Early Hemi Tech

  6. Work In Progress
    Joined: Dec 14, 2010
    Posts: 154

    Work In Progress
    Member

    Hello everyone, I have a couple of questions about valve springs. I bought my 354 15 years ago for my 47 and then life and other projects got in the way so it sat and never fired. When I bought it, I was more concerned with going fast than I am now so since I am pulling it apart to check everything out I wanted to make a couple of changes. Currently it is running Venolia 10.5:1 .030 pistons, a semi mild Isky flat tappet solid cam, 280/485/108LC and some pretty stiff valve springs, the actual numbers have been lost to time but I remember around 150lbs seat pressure. I was thinking of replacing the springs with some stockers to help the cam and valve train assemblies out. Though I've slowed down I still like to have some fun so some 5500 rpm blasts will happen. Would the stock valve springs and heavy valve train handle this without floating? With the pistons installed, valve float could be a real issue. Thanks for any advice...
     
    Last edited: May 1, 2020
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  7. 73RR
    Joined: Jan 29, 2007
    Posts: 6,363

    73RR
    Member

    'Fun' and 5500 rpm will want to see some similar pressure. I'd use 150 at 1.7" and around 275-300 at 1.2".
    With 485 lift you could benefit from a conical spring to get a bit more clearance between retainer and rocker arm.

    .
     
    loudbang likes this.
  8. Work In Progress
    Joined: Dec 14, 2010
    Posts: 154

    Work In Progress
    Member

    Thank you for the quick answer, that's close to what I installed years ago but sure seems high for cam life and stock valvetrain but I respect your amount of knowledge with these engines and it far exceeds mine. I checked the retainer to rocker clearance prior to disassembly and it's ok. Lots of talk about that on this thread so it was the first thing I checked.
     
    loudbang likes this.
  9. Work In Progress
    Joined: Dec 14, 2010
    Posts: 154

    Work In Progress
    Member

    I'm really glad I decided to pull this engine down before running it. Now I know why I got such a good price on it and it came assembled from one of those "reputable" machine shops... I pulled one head apart and found the exhaust guides had a bronze sleeve installed but the intakes are sloppy, anywhere from .005 - .019 stem clearance. I have no problem installing new intake guides but the exhaust guides have an oil hole drilled in them at the spring seat, the sleeves do not. My question is can I or should I drill this hole through the bronze sleeve? I am not planning on using exhaust valve seals.
    Thanks!
     
    Last edited: May 1, 2020
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  10. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    ED9FC464-419A-4C2D-A364-4B98803D3E60.jpeg ED9FC464-419A-4C2D-A364-4B98803D3E60.jpeg 330BBEA3-522D-42F7-AC49-41B68E25103A.jpeg Working on making my own rockers for my 331. I have 5.23” length valves. The long valves should allow for a wide selection of springs.
    Im running a mechanical roller ground to my specs. With the rocker ratios Ive been able to with, final lift should be in the .660”range. With the stands raised and the shafts as close to the head bolts as possible, I think these should make the valve train reliable along with making good power. I drew up a few parts to have cut for templates to “map” final sweep arcs and angles. So far, the max sweep across
    the valve tip surface on the exhaust valve is very small at .029” from open to close. These also allow me to get pushrod angles correct without having an actual rocker arm in hand. ED9FC464-419A-4C2D-A364-4B98803D3E60.jpeg
     
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  11. George
    Joined: Jan 1, 2005
    Posts: 7,267

    George
    Member

    They're not normally used.
     
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  12. Work In Progress
    Joined: Dec 14, 2010
    Posts: 154

    Work In Progress
    Member

    I know this, the guy who assembled my engine years ago put seals on the exhaust.
    I am asking about this oil hole in the exhaust guide, the bronze inserts are not drilled, should they have been?
    [​IMG]


    Sent from my iPhone using H.A.M.B.
     
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  13. hemihotrod66
    Joined: May 5, 2019
    Posts: 201

    hemihotrod66
    Member

    Hot Heads aluminium heads adjustable rockers and springs for a 525 lift blower motor...These rockers have a little more meat in them than the hydraulic rockers do..

    392 Hemi 2.jpg
     
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  14. Work In Progress
    Joined: Dec 14, 2010
    Posts: 154

    Work In Progress
    Member

    Just to follow up, I contacted Hot Heads and found the new guides don't have an oiling hole so that should answer my question, the holes are not needed.
     
    loudbang likes this.
  15. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    Chunk of aluminum to verify off-sets and adjuster/ roller placement.
     

    Attached Files:

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  16. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    Needed more material around the adjuster. Had to tilt the material to gain side to side distance that I need.
     

    Attached Files:

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  17. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    Profile test piece after confirming geometry/ placement...
     

    Attached Files:

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  18. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    More profiling....
     

    Attached Files:

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  19. TRENDZ
    Joined: Oct 16, 2018
    Posts: 196

    TRENDZ

    More profiling...
     

    Attached Files:

    loudbang and C69A like this.

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