Small block rockers?

Small Block Mopar Engine

  1. 1bad360duster

    1bad360duster Well-Known Member

    Messages:
    190
    Likes Received:
    74
    Joined:
    Dec 2, 2009
    Local Time:
    2:18 PM
    Anyone use the comp magnum shaft rockers? I see they only come in a 1.5 ratio but I can get a cam close to the lift I want with that. Prw makes a 1.6 but wondering how the quality of the two stack up? If I’m getting the lift I want with the 1.5 is there any advantage to going 1.6? I know it can effect more then just lift possibly? Thanks
     
  2. pishta

    pishta I know I'm right....

    Messages:
    21,383
    Likes Received:
    10774
    Joined:
    Oct 13, 2004
    Location:
    Tustin, CA
    Local Time:
    12:18 PM
    1.6 is supposed to have a faster ramp rate (same centerline) just due to the dynamics of the leverage and possible a little more duration for the same 1.5 cam. If you don't run a crazy spring, they would work fine.
     
    • Agree Agree x 2
    • go-fish

      go-fish Well-Known Member

      Messages:
      814
      Likes Received:
      917
      Joined:
      May 20, 2010
      Location:
      San Diego, CA
      Local Time:
      2:18 PM
      I have the Competition Camshafts Magnums. Just got the engine back and won't get it put in the truck for awhile. Wist I could give you a report. They looked nice. Looked/felt like a quality product. That's all I can add.
       
      • Like Like x 1
      • wally

        wally muscle car addiction FABO Gold Member

        Messages:
        39
        Likes Received:
        23
        Joined:
        May 31, 2016
        Location:
        N.E. ohio
        Local Time:
        3:18 PM
        I have comp rockers on my LA 408.
        Street / strip duty. Have not had any problems.
        I would recommend them.
         
      • Bobzilla

        Bobzilla Well-Known Member

        Messages:
        1,112
        Likes Received:
        863
        Joined:
        Aug 10, 2017
        Location:
        Southeast Michigan
        Local Time:
        3:18 PM
        Either of those rocker arms will perform well if they are set up correctly. Usually they require the rocker shaft to be moved up and toward the intake side of the head. I have the Comp version but have not installed them yet because the roller tip was so far toward the exhaust side with Edelbrock heads.
        I suggest you call Mike at B3 Racing Engines. You can purchase the rocker arms through him and purchase a correction kit at the same time. That is my plan as well once funds allow it.
        B3 Racing Engines LLC - Performance Engine Building and Mopar Valvetrains
         
        • Agree Agree x 5
        • Like Like x 1
        • Thanks! Thanks! x 1
        • 1bad360duster

          1bad360duster Well-Known Member

          Messages:
          190
          Likes Received:
          74
          Joined:
          Dec 2, 2009
          Local Time:
          2:18 PM
          Thanks for replies guys, anyone have experience with the Mancini brand Harland sharps. They look nice for the price
           
        • 80fbody

          80fbody Well-Known Member

          Messages:
          684
          Likes Received:
          120
          Joined:
          Apr 9, 2011
          Location:
          Belchertown, MA
          Local Time:
          3:18 PM
          I would choose Mancini over those other two. Harland Sharp bodies have proven to be some of the best out there.
           
          • Like Like x 2
          • Agree Agree x 1
          • oldkimmer

            oldkimmer FABO Gold Member FABO Gold Member

            Messages:
            20,495
            Likes Received:
            7420
            Joined:
            Nov 11, 2006
            Location:
            Kindersley, Saskatchewan,
            Local Time:
            2:18 PM
            I used the comps on a 340 build with Speedmaster heads. The pattern was perfect. I think their a great rocker. Kim
             
            • Agree Agree x 1
            • 1bad360duster

              1bad360duster Well-Known Member

              Messages:
              190
              Likes Received:
              74
              Joined:
              Dec 2, 2009
              Local Time:
              2:18 PM
              Comps look nice but I prefer 1.6 ratio otherwise I’d get them
               
            • mopowers

              mopowers Well-Known Member

              Messages:
              6,017
              Likes Received:
              3218
              Joined:
              Feb 15, 2006
              Location:
              West Sacramento, CA
              Local Time:
              12:18 PM
              I've had great luck with my stainless PRW 1.6's. Like anything else, you just have to inspect the hell out of them.
               
              • Agree Agree x 3
              • Like Like x 1
              • 1Badcolt

                1Badcolt Well-Known Member

                Messages:
                3,315
                Likes Received:
                1635
                Joined:
                Mar 15, 2013
                Location:
                Georgia
                Local Time:
                3:18 PM
                Check Hughes roller rockers out before u pull the trigger they are very nice quality they dont have the [BLING] finish but they work and last !!
                 
                • Agree Agree x 2
                • go-fish

                  go-fish Well-Known Member

                  Messages:
                  814
                  Likes Received:
                  917
                  Joined:
                  May 20, 2010
                  Location:
                  San Diego, CA
                  Local Time:
                  2:18 PM
                  We had to use lash caps on the Speedmaster heads with the Comp Cams Ultra Magnums. Didn't know about B3. Hmm.
                   
                • B3RE

                  B3RE B³ Racing Engines

                  Messages:
                  626
                  Likes Received:
                  676
                  Joined:
                  Aug 22, 2013
                  Location:
                  USA
                  Local Time:
                  3:18 PM
                  The Comp rockers are a good choice. I prefer the option of higher ratios not available from Comp, though.

                  Just an FYI for those interested, adding lash caps with a roller rocker will actually make the true running geometry worse, regardless of where the pattern is on the valve tip. See our tech articles for more info.

                  Also, a steel rocker has a much longer fatigue life than an aluminum rocker. If you want to drive the wheels off of it, and have low maintenance and long life, a steel rocker will last much longer.

                  Lastly, we will not make geometry correction kits for Speedmaster/ProComp heads, as manufactured. We have a file with a bunch of broken rocker shaft photos, due to the incorrect machining of the shaft mounting radius in the pedestals. That allows the shaft to rock in the saddle, causing the bolts to loosen. Only if this machining is corrected will we make geometry correction kits. This is not new, and has been known for years to be an issue.

                  If anyone has questions, after reading through our tech articles, feel free to call. I would be happy to provide an explanation to answer those questions.
                   
                  Last edited: Aug 19, 2021
                  • Like Like x 3
                  • Agree Agree x 2
                  • 1bad360duster

                    1bad360duster Well-Known Member

                    Messages:
                    190
                    Likes Received:
                    74
                    Joined:
                    Dec 2, 2009
                    Local Time:
                    2:18 PM
                    Thanks for the info! How do the promaxx and edelbrock castings stack up? I heard they should be very simpliar castings.
                     
                  • Bobzilla

                    Bobzilla Well-Known Member

                    Messages:
                    1,112
                    Likes Received:
                    863
                    Joined:
                    Aug 10, 2017
                    Location:
                    Southeast Michigan
                    Local Time:
                    3:18 PM
                    Thanks for joining the conversation. Very helpful that you check in on these threads when you can.
                    I was just about to add a comment on lash caps. I tried lash caps on mine before I found out about the correction kits you offer. I found the same problem you mention. The roller tip moved back toward the center of the valve tip but the sweep got stupid wide. In my case, lash caps were no better. A couple of correction kits are in my future.
                     
                    • Like Like x 1
                    • B3RE

                      B3RE B³ Racing Engines

                      Messages:
                      626
                      Likes Received:
                      676
                      Joined:
                      Aug 22, 2013
                      Location:
                      USA
                      Local Time:
                      3:18 PM
                      They are better, but I've found that none of the "cheap" heads are really a bargain. Until you get everything right, with components you can trust, the end cost is very similar to more expensive heads. That being said, I understand budgets so you get the best you can afford. Sometimes that means taking more time and making the corrections as funds allow.
                       
                      • Like Like x 1
                      • Agree Agree x 1
                      • 1bad360duster

                        1bad360duster Well-Known Member

                        Messages:
                        190
                        Likes Received:
                        74
                        Joined:
                        Dec 2, 2009
                        Local Time:
                        2:18 PM
                        Understood, I didn’t necessarily mean the components as I know these need to either be replaced or checked, verified etc. I only meant as far as the rocker stand machining/position compared to the issue you brought up about speedmasters. Thanks again
                         
                        • Like Like x 1
                        • 65 Cuda 340

                          65 Cuda 340 FABO Gold Member FABO Gold Member

                          Messages:
                          708
                          Likes Received:
                          994
                          Joined:
                          Dec 27, 2019
                          Location:
                          Tallahassee Florida
                          Local Time:
                          3:18 PM
                          I'm running Comp Magnum rockers on the 360 in my 67 Barracuda. Overkill for my engine, but I had a set sitting around so decided to use them. They are probably 15 years old but have seen few miles.

                          100 miles after installing them and a pair of out-of-the box Indy LAX heads, the intake valve for the #7 cylinder stuck open. Piston bent the valve head, and the engine made all kinds of funny noises, but I drove it 2-3 miles home, and, amazingly, the piston was fine, as was the Comp rocker and, if I remember correctly, even the valve seat and the pushrod (might be wrong about the pushrod, though). Put a new valve in (honed the guide just a bit), and have had no trouble since. (And, of course, the Comp rockers weren't the problem.)

                          Arrow in the pic below points to the rocker for the stuck open valve.

                          IndyLA-Xhead.jpg
                           
                          Last edited: Aug 22, 2021
                        • autoxcuda

                          autoxcuda Well-Known Member

                          Messages:
                          7,435
                          Likes Received:
                          1716
                          Joined:
                          Apr 6, 2007
                          Local Time:
                          12:18 PM
                          About ten years now on my steel Comp Magnum rockers with LA Edelbrock heads.
                           
                        • mopardude318

                          mopardude318 Well-Known Member

                          Messages:
                          10,183
                          Likes Received:
                          1795
                          Joined:
                          Jan 7, 2005
                          Location:
                          Gilroy, Ca
                          Local Time:
                          12:18 PM
                          Maybe try a good used set of factory adjustables?

                          I will be using these bushed units I had done at RAU. Just need to find a good small solid cam & lifters. Going in my w200.

                          @B3RE have you made correction kits for these style rockers?

                          EAAEF854-E0C8-4C76-A098-DB57EC456BBC.jpeg

                          F87FBDF9-5ABF-4694-93B4-3A7EF1A235A0.jpeg
                           
                          Last edited: Aug 22, 2021
                          • Like Like x 4
                          • Ivan Baez

                            Ivan Baez 426 SB daily driver

                            Messages:
                            87
                            Likes Received:
                            41
                            Joined:
                            Aug 14, 2020
                            Location:
                            Queretaro
                            Local Time:
                            2:18 PM
                            I use Hughes engine 1.6 ratio cryo rockers on my 426 SB.

                            WhatsApp Image 2021-08-25 at 9.47.42 AM.jpeg
                             
                            • Like Like x 1
                            • 1Badcolt

                              1Badcolt Well-Known Member

                              Messages:
                              3,315
                              Likes Received:
                              1635
                              Joined:
                              Mar 15, 2013
                              Location:
                              Georgia
                              Local Time:
                              3:18 PM
                            • Nat

                              Nat Well-Known Member

                              Messages:
                              754
                              Likes Received:
                              416
                              Joined:
                              Jun 11, 2019
                              Location:
                              Canada
                              Local Time:
                              8:18 PM
                              exactly what I have been using on my 426 stroker no problems yet only 9000 miles
                               
                            1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                              By continuing to use this site, you are consenting to our use of cookies.