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  1. #1
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    Default help me out with my new combo.

    currently planning a new combo
    standard stroke flat tops 10.1 comp a9l rods
    main and head studs double row timing chain etc.

    now the things i need some advice for i cant decide to run b cast or vn heads i have both types of heads and will need to buy manifold and extrators ethier set i used which will be best for my intedned use?
    cam i am looking at using is a 223@.050 114 lsa .495 lift 2250 to 5250 rev range

    motor will be going in wb tonner with aussie 4 speed and diff with 3.55 and will primarily used for a fri/sat night special having fun sort of set up and wont to make around 400hp.

    any recommendations regarding heads cam manifold and carb would be great cheers

  2. #2
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    That cam would be a fairly good boosted cam . With that comp and gearing you could go a little bigger


    IE at least

    camtech
    CT248
    520
    (a)
    Performance street use. Very strong-mid range, torque & throttle response. Min 9.5:1 comp ratio. Best with 3.25:1+ diff ratio.
    RPM RANGE 2200-5800

    224˚ 230˚ .520" .535" 110˚

    I would def upgrade to later heads also.

  3. #3
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    Default

    Use the VN heads,far better than B cast even untouched.I'd be looking at a cam that has a range between 2800-6000,this will give a you a good torquey motor with a 650-700 cfm carb.Some will say this is to small but my experiance has shown this size works well for street,track work.

  4. #4
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    I agree id go vn heads straight out unless your b cast have had a couple of grand in porting a little work on cleaning the vn heads up and they are good for 450 hp worth of flow but intakes and headers are pricey for the vn heads but will make good power you could chose to run a vn top end as well and have efi pretty cheeply ? cam will depend on the heads and intake as well

    chose your heads first then look at what rpm you wont to run. if you wont to go to 7000 get a high rise then select cam, if 5800 is ok for you go low rise or efi then select a cam

    btw you will still have fun below 6000 grand and you will be able to keep it pretty reliable

  5. #5
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    if you went efi heads with a hiwinder or similar low rise or buch of bannanas these would be good off the shelf cams
    46495 IN. 34/68
    EX.77/39
    282
    295
    234
    244 108 .500"
    .500"
    2900
    5900
    K5043 High performance, street/race cam.


    CT248
    528
    (a) Performance street use. Strong mid range and top end. Requires 9.5:1+ comp ratio and 3.5 + diff ratio
    RPM RANGE 2500-6000
    MAN
    OR
    HI-
    STALL 285˚ 285˚ 230˚ 230˚ .511" .511" 110˚ HYD HYD HT969

    HT969R
    anti pump up TG308 24745
    (1)
    3066
    (2)

    H226/314-2S-8
    Chart B
    244661
    99284-16 r
    99384-16 s
    C969C-16P
    226
    230
    286
    292
    108
    10 36
    48 2
    .000
    .000
    .502
    .496

    for high rise

    CC272
    Chart C
    244681 99250-16
    236
    246
    272
    282
    112
    8 48
    57 9
    .026
    .026
    .508
    .527

    48065 IN. 41/75
    EX.81/43
    295
    305
    245
    255 109 .535"
    .555"
    3000
    6200
    K5073

    CT248
    545
    (a) Street / strip use. Rough idle, strong mid range & top end, modified engines only. Min 10:1 comp ratio, 3.7:1 + diff ratio.
    RPM RANGE 2800-6600
    MAN
    OR
    HI-
    STALL 285˚ 296˚ 238˚ 245˚ .552" .569" 109˚ HYD HYD HT969

    HT969R
    anti pump up TG308 24745
    (1)
    3066
    (2)

    thses are just off the shelf cams some would be a better with more comp than others but you have some info now

  6. #6
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    Unless zero deck height and or shaved heads 10: 1 probably would not happen with a stock stroke.

  7. #7
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    Default

    or 304 pistons ^^

  8. #8
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    Builder said flat tops zero decked and may have to shave heads to get comp.
    Will look into those cams that have been suggested. If the rpm range of the cam starts at 2500 won't it make the car into a bit of a slug below that being a manual

  9. #9
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    Manual you can get away with a bigger cam then a standard auto.
    Yes it may be a little doughy down under those rpms but still plenty if at 10:1 comp.
    The cams with a rev range from 2500 are really not huge anyway.
    Basically motor will be most efficient within that rev range.

  10. #10
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    Default

    my 2 cents worth

    I would read this thread Building a Circuit 308

    about VN heads vs early heads.

    The cost to go VN heads is high even if you need to buy extractors and manifold:

    manifold (two to three times more expensive than early manifold, like perfomer)
    VN rockers covers
    roller rockers is my case were different so extra $650

    cheers

  11. #11
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    cheers had a look at the circuit 308 thing really informative the b cast will be good for down low tourque and vn heads are good for top end. unsure which to choose for car is mainly for street maybe a few runs down the strip thats about it wont be going circuit racing in the tonner lol.

    thanks for the cam recomendations will choose a cam at around the 230 at .050

  12. #12
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    If wanting more down low torque 355 stroker will effectively drop the rpm range around 500 rpm.

    Then a standard stroke motor

    You can get a cast piston kit for not too much. Unless you have already bought pistons the rest is usable.

    Would be better on the vn heads.
    Last edited by morcs6477; 13-08-2012 at 08:41 PM.

  13. #13
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    If you want an extremly safe sure way to have a car that will give you a hell of a lot of fun be an every day driver with good torque plus pull a low 13sec 1/4 take a look at these specs.B cast heads with mild work done,650-700CFM DP,extractors,torquer intake with 1" spacer,10-10.5 to 1 comp & good old faithfull crane 286 cam.I ran this combo for 2yrs in my VL & used it to pull a tandum axle trailer weighing about 1000kgs when loaded with my bricky gear.Then on a Wed night drive to the drags & give most a good run plus light the tyres very easly.Yes it did have an auto plus a stall but hell it was great fun & not expensive to build
    Last edited by Oldman; 14-08-2012 at 12:18 AM.

  14. #14
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    Its always a debate over vn vs b cast style of heads

    ultimatly in the end if you can afford the cash vn is the better way to go you could basicly just use them if you get a good pair to port a old school set of heads and rebuild them to flow even a decent amount cost a fair bit unless you can buy a set of second hand ones.

    i dont think the m21 would handle too much strip work even with streeters on

  15. #15
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    Iv got both a set of b cast and a set of vns just have to decide which ones to use with the combo. Aussie 4 speeds are defiantly not a good idea for constant drag use but I'll probably only take it there once every 6 months would love the car to run a mid 12 would be a nice streeter. With the close ratio of my 4 speed (m22) and my 3.55 diff gears car is most likely better setup with more top end?

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