1.6 verses 1.5 rockers

Big Block A body Tech

  1. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    Is shorter pushrods usually needed? I have 1.5 now and going to 1.6 Thanks. Kim
     
  2. moparmat2000

    moparmat2000 FABO Gold Member FABO Gold Member

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    I could be wrong, but I think the 1.6 ratio is to add to the cam lift. Shorter pushrods kind of negating the 1.6 ratio advantage.
     
  3. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    Not exactly. The shorter pushrod may be needed because of the contact point on the rocker arm. That’s what I think Kim is thinking. You still get the lift extra Benefit.
     
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    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      That’s right Rumble. I have new Smith Brothers pushrods that they made too short. I sent them 1 from the motor so they could make an exact match. But that didn’t happen. I have 4-5 threads under the rocker. I only had 2 b4. I have 1.6 rockers to try. If no difference I’ll give Manton a try. Kim
       
    • AndyF

      AndyF Well-Known Member

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      There is no universal answer, you have to install the new rockers and make a measurement. If you are staying with the same brand of rocker and they were built at roughly the same time then maybe the pushrods will be the same but I wouldn't bet on it. If you are changing brands then almost guaranteed that you'll need different pushrods.
       
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      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

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        Kim, if it hasn’t been to long of a time period, I’d. All and complain. Then add in before the ball gets rollling to far to make a new set instead of duplicates at they should have made in the first place. It’s worth a shot.
         
      • oldkimmer

        oldkimmer FABO Gold Member FABO Gold Member

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        Andy, they are a different brand. I’m hoping they need a shorter pushrod. I would like to get back to 2 or 3 threads showing. Kim
         
      • oldkimmer

        oldkimmer FABO Gold Member FABO Gold Member

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        Rumble, I called them multiple times to no satisfaction. They didn’t help nothing. Didn’t care. This was in July 2017. My race car has sat since then. I’ll never buy from them again or recommend them ever to anyone. Kim
         
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        • xLURKxDOGx

          xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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          That was my experience with them. I told them what I wanted and they gave me a set 1/8 smaller than I told them over the phone and have refused to resolve the issue. Hope you can get them to resolve it Kim.

          J.
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          I am done with them. Even their shipping was crazy to ship to ND. Kim
           
        • 70aarcuda

          70aarcuda Master Hoader of SBM FABO Gold Member

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          I use 1.6 on the intake and 1.5 on the exhaust ...both pushrods are the same length....
          Got at 5 sets of Smith brother pushrods...never had a problem with them....
           
        • AndyF

          AndyF Well-Known Member

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          Different brand means you'll need to mock it up and verify the length. There is no way to know until you measure it.
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          That’s what I figured. May need to get another set of pushrods. Kim
           
        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

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          Mill the heads! No need for pushrods.....
          :rofl:

          Seriously... good luck to you with this. Keep us updated.
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          This with the new pushrods. Old pushrods 2 threads showing. I have run the motor some like this. Smith brothers said it’s ok to run this way as their adjusters have more threads on them. They are new adjusters from them. Kim

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        • A Body 440 WHY NOT

          A Body 440 WHY NOT Well-Known Member

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          Mark the top off the valve stems with a sharpie. Install rockers and adj. bar over the engine . loosen rockers. They will leave a ‘clean’ spot where the rollers are hitting the valve stem
          How many threads above the rocker , by the jam nut ?
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          Threads are flush with jam nut. Kim
           
        • A Body 440 WHY NOT

          A Body 440 WHY NOT Well-Known Member

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          Ideal would be a few threads out the top , but if the pattern on the valve stem looks good and you watch the bottom of the rocker so it does not contact the retainer I don’t think you will have a problem
           
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          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

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            Pattern is pretty good. Lots of clearance. Kim
             
          • yellow rose

            yellow rose Overnight Sensation

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            There shouldn’t be any more than a thread showing. That’s the most. The actual measurement is the adjuster need to be out .281 minus zero, plus .050 which is right out of the book.
             
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