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  • Chevy RV cam

    Just a basic question about a low RPM, high torque cam. I could call a cam company and get a recommendation, but I'd rather get some real world advice.

    I have a '72 Chevy 350 that I will be putting into a '70 GMC 2wd long box. The engine is stock and has a rebuilt Quadrajet on the original cast intake, an HEI dist, and will have long tube headers with a good, but quiet exhaust system. I'm using a TH350, but may switch to a 700R down the road. I'm not sure of the gearing in the rear, but I'm willing to change the gears if necessary. This trucks sole purpose in my life will be to tow an open 20' car trailer and do other jobs that trucks do. I don't need a hot rod, got plenty of those.

    With an eye towards making torque and being fuel efficient, what cam would you put in this engine? Would you change the intake/carb combo or will the ones already on it work well? Please provide specs or a brand and part number you have experience with.

    Thanks, Andy

  • #2

    Re: Chevy RV cam

    Re: Chevy RV cam

    I had a '69 Chevelle with a 350/350 in it. 3:31 rear gear. Trans had a mild shift kit in it, but stock stall. Engine was a '77 350. Edelbrock performer cam and intake. 600 Carter carb and stock manifolds sparked off by an HEI dizzy. I don't know about towing, but the low end in that motor was great. It would pull nice and consistent all the way to 5000 rpm. Didn't even have headers. Just a smooth street combo in a full weight A-body.
    Bakersfield, CA.

    Comment


    • #3

      Re: Chevy RV cam

      Re: Chevy RV cam

      I run this cam in my 350 that I originally had in my 305.
      1.6 :1 roller rockers.




      Which "apparently" according to Desktop Dyno gives me this.



      I like the cam and am glad I used it, accelerates the car hard from standstill, but is out of puff by 4500rpm,
      but I never have to go that high on the street.
      Rearend is 2.90, tranny a B/M 700R4 with lower first.
      Thatīs not the only version Crane has on offer, some need a rear end gear change.

      Comment


      • #4

        Re: Chevy RV cam

        Re: Chevy RV cam

        I run this cam in my 350 that I originally had in my 305.
        1.6 :1 roller rockers.




        Which "apparently" according to Desktop Dyno gives me this.



        I like the cam and am glad I used it, accelerates the car hard from standstill, but is out of puff by 4500rpm,
        but I never have to go that high on the street.
        Rearend is 2.90, tranny a B/M 700R4 with lower first.
        Thatīs not the only version Crane has on offer, some need a rear end gear change.
        I second this except i may use a 1;7 rocker

        Comment


        • #5

          Re: Chevy RV cam

          Re: Chevy RV cam

          I would use Malc's cam, untouched.

          Using a 1.7 rocker could cause valvetrain geometry
          issues, that would not be cost effective.

          Comment


          • #6

            Re: Chevy RV cam

            Re: Chevy RV cam

            I have had numerous 350's over the years in daily drivers. My cam of choice for all of these is always a Summit cam kit. The one that works great for me specs out at:

            Lift....410 Int/.420 Exh
            Duration @ .050....204 int/214 exh

            I put this cam in everything from 1/2 ton trucks to the current engine in my Camaro. It has crisp throttle response, pulls to 5k, and gets on average 18 to 20 MPG. All the DD 350's I've put together are flat top motors with smog heads, performer intake and 600 vac sec. I use a factory high stall converter and highway gears. I think cam and lifters run about $80.
            My way of joking is to tell the truth. It's the funniest joke in the world.

            Comment


            • #7

              Re: Chevy RV cam

              Re: Chevy RV cam

              Thanks for the help guys. I'm considering this one,

              http://store.summitracing.com/partde...2&autoview=sku

              Or this one,

              http://store.summitracing.com/partde...1&autoview=sku

              Comment


              • #8

                Re: Chevy RV cam

                Re: Chevy RV cam

                The second one might make a bit more low end, favoring the exhaust.
                I like Malcs recommendation, it will be drivable, and very strong.

                Comment


                • #9

                  Re: Chevy RV cam

                  Re: Chevy RV cam

                  I put this one into a friends boat with a 350 in it.

                  ELG-E923P

                  .420/.443 Lift
                  ELGIN E923P Camshaft 1955-1994 283-400
                  .420/.443 Lift
                  270°/280° Advertised Duration
                  RPM Range 1500-4000
                  Good Choice for Towing
                  Recommend performance springs
                  112° Lobe Center
                  51° Overlap
                  Good to Fair Idle
                  204°/214° Duration at .050


                  Ended up it works so good (Pulls HARD) that I bought one for my wifes 69 Camaro (Stock '79 350 with an aluminum intake, Q-jet, stock exhaust manifolds, no covertor/gear etc.) Hoping for good street perf and decent mileage untill the LT1 conversion...


                  Chris

                  Comment


                  • #10

                    Re: Chevy RV cam

                    Re: Chevy RV cam

                    Honestly, I'd step up tp a better intake choice.
                    RPM airgap comes to mind.

                    Comment


                    • #11

                      Re: Chevy RV cam

                      Re: Chevy RV cam

                      I have a stock GM aluminum intake for a quadrajet. I don't know what it came off of. Thinking of using it, probably not much help in the way of performance, but might look nice. Probably just use the cast one and spray the whole thing orange, stamped steel valve covers and all.

                      Comment


                      • #12

                        Re: Chevy RV cam

                        Re: Chevy RV cam

                        Well, at least cut the devider between the two sides down, and gain some volume.
                        And port match them and the head ports to the gasket opening, it will help.

                        Comment


                        • #13

                          Re: Chevy RV cam

                          Re: Chevy RV cam

                          Yea - what Bill said - and use the aluminum one - every bit of weight savings helps.

                          Hopefully your header tubes are the proper (smallish) size - big tubes don't help low end torque.

                          A good converter really helps trucks - I got a "tow truck" converter from protorque - best converter I ever had in a truck - made a world of difference in an otherwise stock truck.

                          Tuning your advance curve can help a bunch too with towing and MPG - play with it once you have it running. Sounds like a great combo - should be reliable and fuel efficient with the right tune.
                          There's always something new to learn.

                          Comment


                          • #14

                            Re: Chevy RV cam

                            Re: Chevy RV cam

                            It may cost a little money to get it set up right,
                            but I'd stick with a Q-jet here, too.

                            Comment


                            • #15

                              Re: Chevy RV cam

                              Re: Chevy RV cam

                              well I would agree except i have done it and won, changing from the stock 1:5 rocker to a 1:7 rocker in a non milled head application will not cause any damage, and it will compisate for a not so beefy camshaft. your little .500 cam just turned into a .610 ish cam

                              Comment


                              • #16

                                Re: Chevy RV cam

                                Re: Chevy RV cams for torque...

                                picking an 'RV' cam doen't mean using 25 yr old profiles (yuck!)...unless you wanna go 'poorboy' style...but i appreciate/understand where you (guys) are coming from...

                                did you check out Comp Cams? (they have truck stuff ground on 111 lsa)

                                my .02

                                al
                                "IGNORANCE SHOULD BE EFFIN PAINFUL"

                                522 cubes on One Gun,doin' it on W's at full weight baby!

                                Comment


                                • #17

                                  Re: Chevy RV cam

                                  Re: Chevy RV cam

                                  well I would agree except i have done it and won, changing from the stock 1:5 rocker to a 1:7 rocker in a non milled head application will not cause any damage, and it will compisate for a not so beefy camshaft. your little .500 cam just turned into a .610 ish cam
                                  As long as the rocker stays on top of the valve, I'm happy.

                                  Sure it may have won, but how long did it hold up?
                                  Theres lots of little tricks, some have a short life span.
                                  Valvetrain geometry has to be acceptable, and stable. Period.

                                  Using bigger cams than that, I've seen that unless you go
                                  with a shaft setup, that you can't reliably run a 1.7
                                  without beating up the ends of the valves.

                                  Comment


                                  • #18

                                    Re: Chevy RV cam

                                    Re: Chevy RV cam

                                    Go with a CompCams 268.

                                    Here's a link.
                                    http://store.summitracing.com/partde...2&autoview=sku

                                    I've built many of 350's using this cam from cars to trucks and it worked great in all of them.
                                    Tons of torque and good gas mileage to.

                                    And I'd stay with the Q-jet carb, but maybe step up to a edelbrock performer for the intake.

                                    Comment


                                    • #19

                                      Re: Chevy RV cam

                                      Re: Chevy RV cam

                                      The performer I put in my boat (low rpm "tow truck" type of engine - inboard ski boat that never goes over 4500rpm)
                                      helped not only with throttle response, but the engine also seems to run smoother at all speeds / loads, and picked up some high end as well. Not to mention took weight out of the boat compared to the iron intake.
                                      There's always something new to learn.

                                      Comment


                                      • #20

                                        Re: Chevy RV cam

                                        Re: Chevy RV cam

                                        well I would agree except i have done it and won, changing from the stock 1:5 rocker to a 1:7 rocker in a non milled head application will not cause any damage, and it will compisate for a not so beefy camshaft. your little .500 cam just turned into a .610 ish cam
                                        As long as the rocker stays on top of the valve, I'm happy.

                                        Sure it may have won, but how long did it hold up?
                                        Theres lots of little tricks, some have a short life span.
                                        Valvetrain geometry has to be acceptable, and stable. Period.

                                        Using bigger cams than that, I've seen that unless you go
                                        with a shaft setup, that you can't reliably run a 1.7
                                        without beating up the ends of the valves.
                                        I know plenty of 347 strokers with 1:7 rockers that last a long time ( that motor is gonna get ripped apart about once every two years minimun anyways)

                                        most chevys dont get 1:7 rockers cause they dont need it. chevys are way easier to get bigger cams for. ford arnt unless you go custom grind.

                                        Comment

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