RHS Heads .. Not happy.

Discussion in 'Small Block Mopar Engine' started by SBDart, Feb 21, 2012.

  1. SBDart

    SBDart Well-Known Member

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    I am NOT happy with these heads at all. I have read alot about them and everyone said that was the best head for the money. all good so i drop 1395.00 not thinking i would have to drop more dollors to make them work right .

    not even the person the sold them to me. that they had a geomtry' problem. if he had said that there was a problem i would had said ok what will it take to make it right .. an not batted an eye at it.

    i even ask about this trouble after i had bought the heads. an was told (You should have no issues at all with your setup ) But guess what i do....... and that is what up sets me. all that said...... i know i can be a bitch at times .. but its my money an i want to make it right the first time and not fire it up and it all comes apart the first time.

    i have the indy x RHS heads with the prw 1.5 roller rockers.
    i am having the same trouble with them that everyone else is having. it suck to.

    but when i put it all on a set of j's heads it all clears and the roller on the tip of the rockers set in the right place. i mean in the middle of the valve stem. the rhs heads are no way close to the tip middle.

    is there supposed to be a shim under the spring on the indy x heads??

    I am really thinking about putting these heads back in the boxs. taking the lost , an buying a set of heads that will work for my set up.


    Just venting here. i am Not trying to piss off any one here just my felling . not trying to start a fight here .
     
  2. moper

    moper FABO Gold Member FABO Gold Member

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    Shims under the springs are normal, I wouldn't sweat it. On the rockers and/or expense... and looking for solving the problem, rather than "the principal of it"... Why not just buy the hughes special rockers?
     
  3. ou812

    ou812 Well-Known Member

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    I've run no less than 10 sets of PRW STAINLESS rockers on our RHS heads with NO problems. They sit towards the ex. side of the stem, but they will be fine that way. The SWEEP is what's important and that it's close to the middle. There are a bunch of head combos out there (ford, chevy, etc...) that end up the same way for various reasons...most of the time because of valve length differences over stock.
    You need to remember the stock stem is 3/8 and the RHS is 5/16 so even though it doesn't sit smack dab in the middle it'll be OK.
    Do you have the stainless rockers or aluminum?
     
  4. 340sFastback

    340sFastback Well-Known Member

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    Shims are put under the spring to adjust the install height of the spring so that the spring has the correct spring pressure. It will not affect the rocker arm geometry in any way.

    You should post up a pictures of how the rockers contact the valves. Also, get a check spring and check the rocker arm to valve contact pattern by opening and closing of the valve.
     
  5. LXguy

    LXguy Well-Known Member

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    I can understand the frustration, but unless its way off, you probably don't have anything to worry about.

    I don't see how anyone who could be taken seriously could tell you that the roller will absolutely be right in the middle of the valve on a different set of heads.

    Do you have hydraulic lifters or solid? Is it set up with a checking spring or regular valve spring?

    Have you run the pattern on it?
     
  6. 1wild&crazyguy

    1wild&crazyguy Banned

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    you can make the valve tip a mile wide..lol..then it'll really seem ok ;)

    It is true that if the contact is only a lil off to the exh that it wont 'hurt' anything other than a lil loss of lift.

    With a roller tip, the side loading issue wont be a problem unless its wayyyy off, even then not as worse as non roller.
     
  7. MRL Performance

    MRL Performance Mopar Only Engine Shop. FABO Gold Member

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    This is the head in question

    I suggested using the Comp 619 short style lash caps to help fix it. With the rocker off to the exhaust side the valve is to short, or the rocker stands are to tall. Lash caps will bring it back towards the middle.

    I feel your frustration, we engine builders have to go thru this and a LOT more almost every day to make things right.

    $35 fix
     
  8. Mad Dart

    Mad Dart Nothing to see Here!

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    I'm using the PRW 1.6 Stainless Rockers and Shafts on my RHS set up. Brian at IMM Set up the heads for the use of a Solid Roller using double springs for more Spring Pressure. I originally had the beehive springs but switched the set up out before running the engine.
    Everything clears and the sweep is just about perfect without using lash caps. I think it is 510 lbs over the nose and about 160 lbs closed if I remember correctly, it has been a while.
     
  9. 67mopr

    67mopr Well-Known Member

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    I havent had a bit of problems with mine. I got them at Indy cyl head with the 1.5 roller rockers 202 valves made 483 HP and 510 lb torque on dyno.
     
  10. LXguy

    LXguy Well-Known Member

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    Jeez. Mopar guys are spoiled by the shaft rocker thing. Mustang guys would kill for that. You should see the pedestal mount junk in my Magnum. haha.

    MRL, you got a serious Tribble problem in your shop! ;-)

    OP, use the lash caps or don't. Either way, you'll be fine. This is my opinion: It is based on having seen a lot of guys run stuff worse than that for a long time.

    If it was a heads up car, or going to turn 7000+ for most of its life, you'd want to get it balls-on, but then you would have spent more than $1350 too.

    This is definitely nowhere on the same planet as chucking them in a box and starting over, or having had the heads misrepresented. AKA this is not a serious problem.
     
  11. MoparAnglia

    MoparAnglia Well-Known Member

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    MRL, you got a serious Tribble problem in your shop! ;-)

    Do you suppose he's building something with a Crane Furball cam?

    Sorry.
     
  12. MRL Performance

    MRL Performance Mopar Only Engine Shop. FABO Gold Member

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    Not my pic or shop, its SBDart's.
     
  13. SBDart

    SBDart Well-Known Member

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    Yep that is my pic and my kitten. so what of it.... my kitten likes to help me out at times.....she is more in the way at times . so dont get on mikes case here. thats all on me here, . no more need to be said about my kitten .. NO MIKE DOES NOT HAVE ANY TROULBE IN HIS SHOP (MRL, you got a serious Tribble problem in your shop!) :wink: THANK YOU VERY MUCH.....
     
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    • rumblefish360

      rumblefish360 Looking for a pool to put my pole in.

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      LOL @ the tribble problem.
       
    • SBDart

      SBDart Well-Known Member

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      stainless rockers
       
    • OneOfMany

      OneOfMany Well-Known Member

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      That's the trouble with tribbles..
       
    • crackedback

      crackedback FABO Gold Member FABO Gold Member

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      Run it.

      These issues pop up on SB stuff all the time regardless of head. That sweep isn't bad. If you want a perfectly centered sweep, you'll need to buy every manufactured roller rocker and test them out. Once you find it, run it. Then when you swap out components later, the same rockers may not sweep well. That sweep is miles better than the HS rockers I had on some ede heads...
       
    • moper

      moper FABO Gold Member FABO Gold Member

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      After seeing the swep, it's pretty narrow and it's not too bad. If this was a race effort, as noted by others, I would complain. But for what you're doing it isn't a fatal flaw. A flaw, yes, but not fatal.

      On the tribbles... One of my cats is the same way... She's so curious and will crawl under, or into engine bays if I'm working on stuff.
       
    • lil red

      lil red Well-Known Member

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      not to hijack - but my application and sweep pattern were identical to the posted pics.... I panicked when i first saw the pattern but this post has settled my nerves, MRL do you feel this wipe pattern is acceptable?

      I also used SS PRW 1.6 rockers , although to the outboard side, the sweep of the pattern seems quite narrow

      thanks :prayer:

      Jim

      P.S. ..try a 100 pound chocolate lab crawling around under a car with you
       
    • dustya_383

      dustya_383 MopAr YuNg GUN

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      I have No problems with mine using the Hughes1.6 roller rocker set up geometry is perfect placed rocker shaft shims in place and it's perfect
       
    • MRL Performance

      MRL Performance Mopar Only Engine Shop. FABO Gold Member

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      Its not the best situation, but lash caps will make it just about as good as it gets.

      Lash caps will give the roller a wider foot to press on and bring the roller back to the center of the valve.
       
    • moparlover

      moparlover Well-Known Member

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      and for $34.99 it is a bargain. + shipping

      you could always opt for custom made valves $$$$$
       
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      • dusterdoug

        dusterdoug Well-Known Member

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        Good point; one has to consider the valve stem diameter on these heads. We have Comp Pro Magnum rockers on our RHS heads and found the same thing: that the rocker tip is slightly towards the exhaust side when closed. BUT, as noted above the sweep is fine and we've got about 70 runs so far in the low 10's with no issues. No shims, no lash caps.
         
      • dusterdoug

        dusterdoug Well-Known Member

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        Off topic but my 100 pound black lab and 75 pound yellow lab always JUST have to see what I'm doing under the car. They say they just want to "help"...LOL!
         
      • 1wild&crazyguy

        1wild&crazyguy Banned

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        why not just buy one extra valve, cut it's stem height .010 at a time shorter than where ur at now till the sweep is in the middle...
        jmo

        Its probably true it wont destroy anything, but for me...i wouldnt settle for that.
         
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