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Thread: 308 build

  1. #1
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    Default 308 build

    I know I know thereís heaps of threads on building up a 308 but when you take away the ones that talk about stroker kits and 450hp thereís not much left

    Iíve had an early pollution red motor sitting for about 5 years and thought I better check it before using it. Started pulling it down and itís as clean as a whistle inside. Looks like a recent reco with .040 bores and .020 big ends and mains. Bores are great

    I was just going to put rings bearings and Welch plugs through it which will knock me back only about $400.

    Looking over the engine I though what if I threw $1500-2k at it. What could and what should I do? The bores and crank donít need touching so the money could go on goodies.

    Can some of you in the know give me an idea of what components ( a shopping list I suppose) would build a torquey cruiser. It would be nice if it sounded like it meant business too.



    Going in HX van with T5 and 3.08 diff. Have 3.55 too
    Thanks in advance

  2. #2
    427
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    Nice hydraylic cam and some roller rockers. 2 grand don't buy much these days..just my opinion ☺

  3. #3
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    Compression.

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    I think you should look at it as a work in progress. Spend a bit more when you can afford it. If you start with a cam, lifters and raise compression then that gets the motor done.
    Later extractors and an exhaust.

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    Ok. Bump up the compression with flat tops then what cam?

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    REALY 308 & early heads are shit power! VN heads WAY better like 100hp better! just small port job and done!
    Make any heavy VAN move gearing is the trick!
    If it was me VN-VP 304 injected conversion with 4speed auto 2500 stall 3.08 or 3.55 diff gears! done
    why? first gear is really good to get off the line quick! mail order tunes & are cheap & work a charm!

    early heads cost more to port them, compered doing a whole conversion! and still slow!

    Manual need very expensive clutch, Billit fly & button clutch. I know trust me had a wagon. Failed so many times
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    My Channel You Tube - VK 327 Stroker E85 Fueled since 2008
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    DR327VK are you saying donít bother with the red 308 at all and get hold of a complete VN-VP engine for a conversion?

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    my thoughts are, the least expensive option would be a L34 spec engine, using what you have.

    Then I think that the VN head option would be the next of course with a different cam to the early head deal..

    after that it is an engine change like the above mentioned injected 304 combo. or LS etc.. This option In qld at least does not allow the removal of all the bullshut you need to deal with. meaning other than going back to completely stock spec, you can't for instance if you want put on a carburetor.

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    Quote Originally Posted by CrustyHK View Post
    Ok. Bump up the compression with flat tops then what cam?
    Given that you are on a limited budget planing the heads would be a lot cheaper option. As mentioned by others going to vn heads
    would be a lot better option. You would also need a different type of cam and extractors. All this could take you over budget so you
    would have to price what everything costs and go from there.

  10. #10
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    Use the red bottom end, throw on a set of stock VN heads and a small cam. With a small cam you can save some coin by using stock VN rockers. Get the heads decked to bring the comp up a little. You'll need a different intake and headers but these can be had for a reasonable price these days. Depending on what you can get your hands on (second hand or new) it might slightly stretch the budget but you'll be better off in the long run.

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    You have stated the bores and crank are good and donít need touching.
    Are the .040Ē pistons in the engine standard style dish top or are they flat tops?
    Are the early heads you have in good condition or also recently had a reco?

    If the pistons are standard dish tops you are limited to what cam you can put in the engine due to lack of compression.
    Sure you can really skim the guts out of the heads to gain some comp but you can run into other dramas with that. Not to mention if you already have Ďgood standard recoí early heads you arenít going to gain heaps with just bolt on goodies and doing nothing else.

    In my opinion it also depends on what parts you have sitting around for this engine (intake and exhaust wise) Your money can get soaked up pretty quick unless you are slowly sourcing cheap bits.

    If you already have extractors and a decent intake manifold for those early heads, keep your bottom end as it is and Iíd get the heads skimmed to gain some comp, slot in a mild cam, use the extractors and 4 barrel inlet manifold with a Quady or Holley carb. It will go make some improvements to performance which may be enough for you to meet your Ďtorquey cruiserí requirements.

    If you had to buy an intake manifold and extractors Iíd go the VN EFI head option and buy a cam package to suit with some skimmed VN heads.

    There are a number of options and opinions but it really depends on how much power youíre after and how much cash you are prepared to spend to achieve it...

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    Thanks for the info guys I do appreciate it.
    What if I tackle this slightly differently then. The current pistons are standard dish tops. What if I throw some more $$ at it and fit new big ends, mains and a new set of flat tops. Then said I have 2k to spend. Disregard extractors in that 2k.
    Iím then left with what to do with heads manifold and cam. Itís got a quadrajet now and there seems to be a real love hate relationship out there for them. I get that a holley is a big chunk out of that budget but if the consensus is Iím wasting time with a quadrajet and need a Holley Iíll find the $$ for the Holley.

    Iím an old bloke and donít need to be shredding tyres but would like a strong reliable engine.

    Cheers

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    Quote Originally Posted by CrustyHK View Post
    Thanks for the info guys I do appreciate it.
    What if I tackle this slightly differently then. The current pistons are standard dish tops. What if I throw some more $$ at it and fit new big ends, mains and a new set of flat tops. Then said I have 2k to spend. Disregard extractors in that 2k.
    I’m then left with what to do with heads manifold and cam. It’s got a quadrajet now and there seems to be a real love hate relationship out there for them. I get that a holley is a big chunk out of that budget but if the consensus is I’m wasting time with a quadrajet and need a Holley I’ll find the $$ for the Holley.

    I’m an old bloke and don’t need to be shredding tyres but would like a strong reliable engine.

    Cheers
    If you look at the thread on quadrajet carburettors you will find more love for them than the holley.

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    Stick with the QJ. Do not over-cam it. You said you wanted a torquey cruiser. You have a not-so-big engine powering a heavy van with 3.08 diff. A big cam can easily turn that into canine status. Flat top pistons will increase CR. That allows a slightly bigger cam because the higher CR will restore the loss of low end tq with the bigger cam. A big cam with dished pistons would be a t**d.

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    Quote Originally Posted by GtoGeoff View Post
    Stick with the QJ. Do not over-cam it. You said you wanted a torquey cruiser. You have a not-so-big engine powering a heavy van with 3.08 diff. A big cam can easily turn that into canine status. Flat top pistons will increase CR. That allows a slightly bigger cam because the higher CR will restore the loss of low end tq with the bigger cam. A big cam with dished pistons would be a t**d.
    This is probably going to get me shot down in flames but how do I determine what cam to use? With the responses here Iím looking at VN heads probably with stock rockers. (And thatís why I asked) Iím guessing stock VN heads would still be a better option than the stock red motor heads

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