Roller cam suggestions - 383

Discussion in 'High Performance Modifications' started by EricsZ28, Jul 18, 2011.

  1. EricsZ28

    EricsZ28 Veteran Member Lifetime Gold Member

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    This is for my mostly street, and occasional strip, 383 in my '80 Z28 (heavy) running power brakes. For perspective, I have a hyd flat tappet now that is decent - 230/236° at 0.050 and 274/286 adv with 0.49/0.49" lift. I want something with a little more guts.

    The cam has to be ground on the small base circle - in case that changes your answer at all.

    Engine:
    • 383 (3.75 stroke, 5.7 rods, cast internals)
    • TKO600 + 3.73's + 29" tires
    • 10.1 : 1 CR (flat top hyper pistons with 2 reliefs at +5cc)
    • Pistons sit 0.025" in the hole with a 0.028" gasket
    • Edelbrock RPM heads (70 cc, 185 runners, 0.575 max lift)
    • Edelbrock RPM intake (notched plenum)
    • 1.5 ratio full roller rockers
    • 1 5/8 long tube headers, 3" collector, 2.5" exhaust (h-pipe)
    • MSD Ignition / analog box
    • Holley carb - currently a 650 but likely to go 750 in future

    Also, I'm assuming I'll have to swap valve springs, pushrods, lifters, and the cam when I do this. Everything else should be reusable, right? Engine has VERY low miles since rebuild.

    Thanks guys!
    - Eric
     
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    I just bought the Howards cam/lifter combo, saves a few bucks. I actually called Sumit b/c all the cam kits listed were on 112* centerline and I wanted 110*. Sales guy said no problem, they drop shipped directly from Howards. As for valvesprings, those a pretty good springs that come with RPM heads and should be alright with a hydraulic roller.
     
  3. GM72_SuperSport

    GM72_SuperSport Veteran Member

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    How do you like howards corky? I'm thinking about using their full retro fit roller kit on my 406 build
     
  4. warped

    warped Veteran Member Lifetime Gold Member

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  5. CamaroMan79

    CamaroMan79 Veteran Member Lifetime Gold Member

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    Comp Cam XR282HR
     
  6. EricsZ28

    EricsZ28 Veteran Member Lifetime Gold Member

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    You must really like this cam :crazy: I was actually thinking about the XR276HR as well (I keep seeing this one come up).

    I talked to Howards and they suggested one slightly tamer than the Comps listed above and ground on the 112 to keep the idle more subtle.

    Seriously, thanks for the suggestions so far. I'm looking into all of them.
     
  7. Notalent

    Notalent Veteran Member

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    We love this Howards cam. We use them on basically the same engine package with a Quick Fuel 680cfm Street carb and they hit over 450HP/475TQ. With a 650 Double pumper we have seen 460+HP. The howards guy was right, if your street driving I prefer the 112LSA as its a bit smoother and will help with vacuum.

    http://www.summitracing.com/parts/HRS-110255-10/
     
  8. EricsZ28

    EricsZ28 Veteran Member Lifetime Gold Member

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    Yes. I like this one better than the one their tech picked - but I think he was trying to get a better (smoother) idle for me... I'll have to call them back and discuss this some more.

    I've been hearing a lot of positive feedback about Howards cams on this board...
     
  9. Notalent

    Notalent Veteran Member

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    Howards is one of the OE cam grinders. Nothing but the best here and proven track record. Comp just pays alot more for advertising so they are out there more and still good stuff.
     
  10. hhott71

    hhott71 R.I.P 11/19/18 Lifetime Gold Member

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    You need the Felpro 1094 gaskets that are 0.015" thick to go with your 0.025" deck height.

    The cam should bne a reduced base circle cam for added clearence with the rods.

    Crane has a nice selection of cams that fill the bill and they don't require a bronze Distributor gear.
     

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