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  • max. rpm

    what is the redline for stude v-8's in stock form non r-series? and whats the redline for the r-series engines? will these engines live at 6000-6500 rpm? and has anyone tried the hyd. lifter conversion? is it worth it? how is the cam choises for hyd?

  • #2
    Both Std. with good R1 valve springs and R1 like about 5500 RPM and reach Max H.P. there. The R2& R3, will go about another 500 to 800.
    Ted Harbit has never had to rev his engines more than that to beat every big Block out there, so there is no need.

    Hydraulic Lifters and Cam are available from one source with few sold, and I see no gain at all with them unless you really want quiet! Just a big waste of money in my opinion.

    When you already have the best; a gear Drive and solid lifters, why would you want to change that? [xx(]

    Second Generation Stude Driver,
    Proud '54 Starliner Owner


    • #3

      You're very welcome to join us at for hours upon hours of high performance Studebakering.



      • #4
        I drive my stock R1 powered 54 Coupe regularly. It seems to love revving into the 4500 - 5000 rpm range and does so effortlessly. It'll cruise at 3000 on the freeway with the only complaint being that the car is a bit noisy in the first place, which is why I'm moving to a T85 with OD. I considered the T5 swap, but the T85 is a drop in affair. I used to run a high compression, and larger valved 259 which revved to 6000 quite easily, and was very fun to drive. I pounded that car for years and it always ran great. It also had the T85. Also, echoing what StudeRich said.... why would you want to move to inferior hydraulic lifters??? Build your engine with at least 9:1 compression, as large an intake valve you can fit comfortably, which should be around a 1.88, a 1.5 exhaust valve, an R1/R2 cam and top it off with a 500 or 550 cfm 4 bbl carb and you'll have a blast of a car to drive. Good luck and have fun.



        • #5
          thanks guys. just though that the hyd. lifters might be advantage in selecting a wider range of cam profiles. just checking.i've owned y-blocks all my life so adjusting valve is second nature to me.what's the rocker ratio on the stude v-8? are they all the same or the r-series different?


          • #6
            All Stude V8 rocker arms are the same 1.5 nominal ratio. Whether using hydraulic or solid lifters,
            quote:the advantage in selecting a wider range of cam profiles
            is in actuality limited by the available material on the Stude cam core. None of the modern "high intensity" lobes will fit. Just not enough stock on the core.

            Another FWIW, most Stude OEM tachs are not a reliable witness of actual RPM. They were old technology when new and fifty years later are dirty, need lubrication, contacts cleaned and calibration. Best way is to have a new tach installed behind the old face and calibrated by a shop.

            Contemporary magazine articles and personal experience says most '56-64 standard 289" engines, especially the supercharged GH/Packard versions, start to show symptoms of valve float above 4500. The standard cam doesn't make any horsepower above 5,000 anyway.

            My experience is the R1 cam and valve springs will usually go to 5500 reliably on a normally aspirated engine, if everything is fresh. Adding larger diameter heavier R3 intake valves, will require greater valve spring pressure to achieve the same RPM. Same with adding supercharger boost pressure. Since the supercharger belts begin to slip at higher RPMs anyway, heavier valve springs only earn their money if much work is done to hold boost in the 5,000+RPM range.

            thnx, jack vines