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Thread: 355 cam choice

  1. #1
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    Talking 355 cam choice

    Need some help deciding on a cam for my 355 stroker, i know its the most annoying question, but its for my baby, my vchdt and i know bugger all about cams.

    I have a 304 vt roller block , scat stroker crank, 5.7 inch h beam rods, 30 thou forged flat tops, torque power hi rise dual plane
    the car is a manual , with 3.36 rear diff

    I'm not chasing straight line speed, its mostly a cruiser I want to be able to jump in and start it and drive it , so street manners . But of coarse I want it to be worth while all the effort for stroking, and have the power to drop skids when I ask it too.

    teach me

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    HI
    What heads ya running . Heads /airflow will dictate cam numbers for street or drag . Sounds like stocker cast iron ?

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    Hydraulic or solid roller?

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    Yeah staying vn heads cast iron, want to stay roller cam

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    Yeah ok mate... work with us here... hyd or solid ?

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    Stock heads, stock rockers? Hydro roller 100%, no need for a solid roller for a street cruiser.

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    Hi
    Your cam selection is similar to hyd roller equipped votec headed 350 chev
    Duration at .050 around the 220 thru 235 split duration cam with a 110lsa [mainly for vacumm] EG 230/234 on 110LSA
    Having a wide split eg 230/240 will take away tq prior to peak TQ eg 4500rpm and put it in the topend after peak TQ
    eg lifting the topend of the dyno curve ,effects both tq and hp . Best to keep the split to 4--8deg


    A mild cam would peak hp at 5700-6200rpm . Dyno sheets can lie about hp but the rpm at which it happens is typically correct . U need to find some dyno results to help selection


    http://www.crowcams.com.au/Portals/0...-19-132505-793
    Last edited by swampy; 20-10-2018 at 09:53 PM.

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    That's what I have been finding difficult. I can't seem to find a lot of combos with hydraulic roller cams and most are autos.
    Crane cams has a hydraulic cam 888241 which has 226 230 ? Is that sort of where I should be at?

    I will match the valve train with the cam, and cost is not really an issue . Without going stupid

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    That cam looks to be in the ballpark. Stock heads are good for a bit over 400hp. That cam should get you there.

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    Quote Originally Posted by HDT166 View Post
    That's what I have been finding difficult. I can't seem to find a lot of combos with hydraulic roller cams and most are autos.
    Crane cams has a hydraulic cam 888241 which has 226 230 ? Is that sort of where I should be at?

    I will match the valve train with the cam, and cost is not really an issue . Without going stupid
    That cam should work well in yours.

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    the other cam that takes my interest is 888261 which is a bit more aggressive 234 and 238 . but im unsure if that is going to be a pig to drive. power comes in at 3200 rpm, which seems a bit high.
    or there is also the cam in the middle of those 888251 which is 230 and 234 .
    god all these numbers hurt my dyslexic head lol

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    HI
    You have tight gearing and no stall convertor re manual . Although many have run taller cams 226/230 would be good . Great midrange and a little at both ends . The 230/234 would also be good but no bigger .

    Same cu in engine
    Restrictive heads require bigger cam to achieve the same peak TQ HP at RPM compared to very good head flow can take a smaller camshaft spec to achieve the spec at Rpm as the restrictive head setup

    Remember in the crane catalogue it MENTIONS CAMS perform 500rpm lower on a 355 cuin
    cranecams.com.au/pdfs/HoldenCams_Guidesheet_29-07-16.pdf

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    I'd go with the Camtech over the Crane.

    I'd go for something like this CT2248 49903 Similar to the Crane but less advertised duration. Will go better than the Crane equivalent.

    Give the heads and basic pocket port and it should be a fun engine with a manual trans.
    Last edited by immortality; 22-10-2018 at 01:04 PM.

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    Hi
    The Edelbrock vortec 350 uses 234-238 roller
    The disadvantage when u look at the dyno sheet is the curve below peak Tq really dips before rising again for the 2nd time up to its peak .Tq no. at 4500rpm

    What this means . U need to drive with Rpm above the 2500-3000 rpm level ideally . Having a 3.36 diff will tie down the engine performance .

    Going down a cam size to 230/234 would be better for the tq curve shape and better suited to the 3.36 gearing . Still giving good performance usage . Performance but a little milder 226/230 and the best drive ability .

    The choice is yours
    Last edited by swampy; 22-10-2018 at 02:00 PM.

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    some really awesome help here. I was leaning towards the 230 234 over the 226 230, mainly I guess if I wanted to do more to the heads later . decisions , decisions

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