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  1. #1
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    Default Roller cam thoughts.

    The ol 355 is getting a freshen up after a waterjacket leaked into the sump. (where I ground stroker clearance) Things got rusty on the inside. Anyway that's all fixed and I've decided to move on up to a solid roller cam. This is one of the newer ones from the Crane catalogue. My machinist likes it.

    250/258 @ .050", 108 lobe sep, .643" lift on int & exh.

    Engine is 11.5 comp. VT heads flow (after a tickle up) 276 int & 182 exh at the .643 lift.

    Going in an LX hatch. Street car class at the strip. No cage so 11.0 is the fastest It can go over here. Hopefully crack a high 10 just once.

    Still die hard manual box.

    What do you reckon, does that add up ok?

    Bit more info. Ported T/P single plane intake. 780 race Holley, Tri-y headers, 1 3/4 primaries. 3" collectors
    Last edited by RedTaxi; 11-04-2019 at 11:39 AM.

  2. #2
    Do you ever leave? paulzig's Avatar
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    I like it too... It will peak close to 7000RPM if that is what you want...

    The manual will kill your ET unless you put a drag race style clutch in, like a slipper...

  3. #3
    254RWHP boat anchor EVL253's Avatar
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    or a normal style clutch but its gonna be a consumable if you slip it enough to not bog the engine
    11 second E85 bottle fed boat anchor

  4. #4
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by EVL253 View Post
    or a normal style clutch but its gonna be a consumable if you slip it enough to not bog the engine
    Harder to make a normal street style clutch plate act like that Ideally you want slip a fair way through like a stall..

  5. #5
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    7000 is about right. Looks like a winner then except for the clutch. Which I kinda knew after looking at my clutch. Trying to control slip on a single plate can finish it in one go. (i found out) It does bog when you dump it, it kinda goes grab, grab, grab and you're off. But it needs some street manners too. The slipper thing sounds a bit too hocus pocus for me.

  6. #6
    Sure why not? 76lxhatch's Avatar
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    I'm only running high 12s @107 (1.88 60ft on skinny slicks) but I just not long installed one of those McLeod twin organic plate clutches because the heavy duty single kept spinning and seems pretty good so far. If you're not aware of where the engagement point is and drop the pedal too fast it can be a little vicious but generally you can't even tell its not just a standard clutch. Can be slipped a little off the line but still locks up when you fully release it, was pretty happy with how it behaved on a sticky track. Time will tell what its life expectancy is but being fully organic I'm hoping it will last a while (needs to, to justify the cost), wasn't happy with a previous ceramic plate lasting less than a set of tyres!

  7. #7
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by RedTaxi View Post
    7000 is about right. Looks like a winner then except for the clutch. Which I kinda knew after looking at my clutch. Trying to control slip on a single plate can finish it in one go. (i found out) It does bog when you dump it, it kinda goes grab, grab, grab and you're off. But it needs some street manners too. The slipper thing sounds a bit too hocus pocus for me.
    Yeah the slipper stuff is expensive too.. Anyway, if it does peak at 7000 or near too I would keep that going as long as power doesnt nose over really bad so around 7500 at the finish line, you have enough cam for 550-600HP. I know cams are expensive in NZ, but here its close to same $$ to pick out custom lobes from the Comp catalogue than buy Crane shelf..

  8. #8
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    My neighbour does cams. He's one of the leading guys over here. He just needs to get the crane steel billet for me. The lifters are the expensive bit.

  9. #9
    Do you ever leave? immortality's Avatar
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    Geez that's handy.

  10. #10
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    Quote Originally Posted by RedTaxi View Post
    My neighbour does cams. He's one of the leading guys over here. He just needs to get the crane steel billet for me. The lifters are the expensive bit.
    Cool... Unfortunately quality Crane roller lifters (solid or hydraulic) are pricey...

  11. #11
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by 46Crab View Post
    Cool... Unfortunately quality Crane roller lifters (solid or hydraulic) are pricey...
    True, but you also get, what you pay for.

    Good choice on cam too.
    Last edited by EH179; 12-04-2019 at 05:43 PM.

  12. #12
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    Quote Originally Posted by EH179 View Post
    True, but you also get, what you pay for.

    Good choice on cam too.
    Totally agree, no argument from me.

  13. #13
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    Quote Originally Posted by RedTaxi View Post
    The ol 355 is getting a freshen up after a waterjacket leaked into the sump. (where I ground stroker clearance) Things got rusty on the inside. Anyway that's all fixed and I've decided to move on up to a solid roller cam. This is one of the newer ones from the Crane catalogue. My machinist likes it.

    250/258 @ .050", 108 lobe sep, .643" lift on int & exh.

    Engine is 11.5 comp. VT heads flow (after a tickle up) 276 int & 182 exh at the .643 lift.

    Going in an LX hatch. Street car class at the strip. No cage so 11.0 is the fastest It can go over here. Hopefully crack a high 10 just once.

    Still die hard manual box.

    What do you reckon, does that add up ok?

    Bit more info. Ported T/P single plane intake. 780 race Holley, Tri-y headers, 1 3/4 primaries. 3" collectors
    Flywheel mass needs to be at least 14kg for smoother launches - light is seldom right for drags.

  14. #14
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    Yep flywheel is std weight.

  15. #15
    Sure why not? 76lxhatch's Avatar
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    14kg is heavier than standard on a Holden V8, I wouldn't go quite that far. A lot of manufacturers just offer Chevy flywheels with the slightly different bolt pattern, I guess they had heavier options from factory.

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