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  1. #1
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    Default Is this a good 308 combo? New to this!

    I am building a 308, stock bottom end, Hq heads with VN valve size, was thinking about crowcam 5649 hi stall (2800)
    Few questions, do I need rollers? double valve springs, as it's standard valve springs, standard rockers....
    Will this combo hold up? I won't be revving the guts out of it every drive, just want the power for when I do need it.
    Diff ratio 3.55 and all of this in a HQ ute, (not a tonner)
    With this combo the engine won't need balancing will it?
    Also if I was to run this down the strip what times what I be looking at with that combo?
    Any other suggestions?
    Just I am on a very tight budget at the moment....

  2. #2
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    Default My 308 combo - Suggestions -

    HQ heads, VN valve size, single valve springs, normal rockers
    Standard bottom end,
    Was thinking this cam....
    Crow cam 5649 - Is this a good cam shaft for my combo? Will buy new lifters, pushrods as a cam package.
    Diff gears, 3.55
    Trimatic, stall 2800
    I am really wanting to learn all this myself, is this pretty much just all bolt in without a balance?


    What times do you think i'de be looking at down the 1/4 as well?


    On a very tight budget so am hoping this is a good combo....

  3. #3
    Do you ever leave? paulzig's Avatar
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    Default

    On a standard bottom end that cam is too much .... If you rebuilt the short with flat tops and got 10 to 10.5:1 compression it'd run better ....

  4. #4
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    Default

    Ok, so should I maybe go a little less cam? Maybe a Crow 5620? or Crow 5761?
    Just the blocks already been assembled for me...
    It's out of the car, it's just I can't really afford a balance as well budget will not allow it.
    Last edited by hquteman; 07-01-2017 at 01:47 PM.

  5. #5
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    Default

    Even any other suggested cams for my application?
    Camtech / crane etc

  6. #6
    Not the Kingswood! hq308's Avatar
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    Default My 308 combo - Suggestions -

    With a stock unbalanced bottom end you probably want something with a max rpm of 5000-5500. It's not going to have a lot of comp so keep the cam small IMHO.

  7. #7
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    Default Chamber in Red 308 heads

    Picked up these heads off ebay for $350
    Same size valves as VN, double valve springs, have all been cleaned, valve guides done, valve seats and seals have all been done.
    Few questions, have the chambers been done at all?

    Also, I'll be running stock bottom end, it has the stock rockers as well...
    Which cam would best be suited with.....
    Trimatic, Shift kit done, 2800 stall
    Sals 3.55

    Wanting this combo for a weekend car, so not needing good fuel economy.
    Regards.
    Attached Images Attached Images

  8. #8
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    Default

    Hq308 thanks for the reply, appreciate it...
    What cam would you be recommending ?

  9. #9
    Do you ever leave? paulzig's Avatar
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    call camtech up and get something smaller like 218@50thou cam if you arent gonna see over 6000RPM

  10. #10
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    Default

    Paul, If i was to go the flattop pistons, and then a balance, would that give me a lot more to choose from?
    Just that will be budget done.

  11. #11
    Not the Kingswood! hq308's Avatar
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    Flat tops and balance will give you lots more options, more comp and rpm will make more power. As Paul has suggested call Malcolm at Camtech with your final engine specs and he will recommend a suitable cam.

    IMO if you are sticking with the stock bottom end you'll be better off with standard heads as you won't be turning the engine rpm enough to justify the big valve heads. Some will even say the big valve heads need more cubes (ie 355) but I previously ran big valves on my standard stroke 10.5-1 with no issues.

  12. #12
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    Engine balancing is for bottom end.
    Technically the stock setup will handle that cam.
    Had a nason cam 224 square @ 50 , .496 lift and 110 lsa on blue 308 with a performer , 11:1 comp, stock valve springs and crane energisers. Made 192rwk through a tremec and 9 inch Detroit locker. Would have run low 13s easy. I wouldn't go any bigger than the 5761 crow on a stock engine.

  13. #13
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by hq308 View Post
    Flat tops and balance will give you lots more options, more comp and rpm will make more power. As Paul has suggested call Malcolm at Camtech with your final engine specs and he will recommend a suitable cam.

    IMO if you are sticking with the stock bottom end you'll be better off with standard heads as you won't be turning the engine rpm enough to justify the big valve heads. Some will even say the big valve heads need more cubes (ie 355) but I previously ran big valves on my standard stroke 10.5-1 with no issues.
    The stock 304 VN headed engines were the same, and they have bigger heads same size valve and still go good ....

  14. #14
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    Default Compression

    Quote Originally Posted by Str8upal View Post
    Engine balancing is for bottom end.
    Technically the stock setup will handle that cam.
    Had a nason cam 224 square @ 50 , .496 lift and 110 lsa on blue 308 with a performer , 11:1 comp, stock valve springs and crane energisers. Made 192rwk through a tremec and 9 inch Detroit locker. Would have run low 13s easy. I wouldn't go any bigger than the 5761 crow on a stock engine.

    Did you get the block and heads surfaced to get that compression?

  15. #15
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    Default

    I'd like to bump up the compression without spending too much.
    Just to get new pistons and a balance I'd be looking at another 1000 up here in Cairns.
    They are robbers up here.

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