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  1. #1
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    Default 308 build help first timer

    Hey guys, posting here as over the years there is a generous wealth of knowledge and people happy to share.

    I'm planning a full rebuild of my 308 out of my HJ statesman, and have a couple of questions.

    Firstly, i have an opportunity to buy a compete 304 motor (VS I think) for a $1000 - do you guys think its a better option to build the 304, or just save the grand and build the 308 motor that's already in the car?

    Secondly, I'm having the T400 rebuilt and I'm not sure what size torque converter I need. What is the formula for calculating what size I need, and what is a good brand?

    Thanks guys, appreciate any advice.

    Sent from my SM-T355Y using Tapatalk

  2. #2
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    Torque converter is the last thing you buy.

    After the engine is assembled, diff built etc.

  3. #3
    Do you ever leave? HQ308Ute's Avatar
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    depends..are you a numbers guy? The early Holdens are going up in value so original motor maybe better, unless you take it out and store it in the shed and sell it with the car if and when you sell it one day.
    the 304 has much better cylinder heads.. but you can get a set for couple of hundred.. if you're doing a rebuild you're buying new cam and stuff anyway..
    meh i'd just do the motor in it personally.
    Last edited by HQ308Ute; 18-06-2019 at 06:29 PM.

  4. #4
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Adam76 View Post
    Hey guys, posting here as over the years there is a generous wealth of knowledge and people happy to share.

    I'm planning a full rebuild of my 308 out of my HJ statesman, and have a couple of questions.

    Firstly, i have an opportunity to buy a compete 304 motor (VS I think) for a $1000 - do you guys think its a better option to build the 304, or just save the grand and build the 308 motor that's already in the car?

    Secondly, I'm having the T400 rebuilt and I'm not sure what size torque converter I need. What is the formula for calculating what size I need, and what is a good brand?

    Thanks guys, appreciate any advice.

    Sent from my SM-T355Y using Tapatalk
    Buy the 304 much better departure point with the VN heads..

    For the stall 1000-1500 below peak HP RPM which would be an 8 or 9" converter depending on how the engine goes and gearing.. But most people just get a 3000-3500 10" and dont worry about it..

  5. #5
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    Quote Originally Posted by paulzig View Post
    Buy the 304 much better departure point with the VN heads..

    For the stall 1000-1500 below peak HP RPM which would be an 8 or 9" converter depending on how the engine goes and gearing.. But most people just get a 3000-3500 10" and dont worry about it..
    Thanks paulzig, 1500 below peak rpm.... but how do I know what my peak rpm HP is until I get it dyno tuned? Do I just take a guess, or do I look at the cam specs to work out the stall size? Thanks Adam

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    Quote Originally Posted by HQ308Ute View Post
    depends..are you a numbers guy? The early Holdens are going up in value so original motor maybe better, unless you take it out and store it in the shed and sell it with the car if and when you sell it one day.
    the 304 has much better cylinder heads.. but you can get a set for couple of hundred.. if you're doing a rebuild you're buying new cam and stuff anyway..
    meh i'd just do the motor in it personally.
    Thanks HQ308ute, can you make the early Holden has flow as good a the VN heads? Would it be cost effective? Thanks Adam

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  7. #7
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    Quote Originally Posted by Adam76 View Post
    Thanks paulzig, 1500 below peak rpm.... but how do I know what my peak rpm HP is until I get it dyno tuned? Do I just take a guess, or do I look at the cam specs to work out the stall size? Thanks Adam

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    Well you buy the converter after the engine is dyno'ed then you give the info to the converter builders... 90% of people who dont want a street strip car never buy an 8" 5000RPM converter because they are afraid, if its not a street/strip car and you dont care about drag strip performance go to a 3500 converter

  8. #8
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Adam76 View Post
    Thanks HQ308ute, can you make the early Holden has flow as good a the VN heads? Would it be cost effective? Thanks Adam

    Sent from my SM-T355Y using Tapatalk
    You could but if you do the same work to a VN head you'll get better.. Most cost effective is a set of VN heads no porting, just a recondition with new seat cuts and blend in the sharp ridges where the cutter has gone, thats it, no need to port you can make 400-450HP like that

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    Quote Originally Posted by Adam76 View Post
    Thanks HQ308ute, can you make the early Holden has flow as good a the VN heads? Would it be cost effective? Thanks Adam

    Sent from my SM-T355Y using Tapatalk
    Short answer... No. Not cost effective. There are a few guys that can really get a set of early Holden V8 heads flowing but you will pay for it.

  10. #10
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    Default 308 build help first timer

    What Pauly said

  11. #11
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    Quote Originally Posted by paulzig View Post
    You could but if you do the same work to a VN head you'll get better.. Most cost effective is a set of VN heads no porting, just a recondition with new seat cuts and blend in the sharp ridges where the cutter has gone, thats it, no need to port you can make 400-450HP like that
    You beat me to it

  12. #12
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    Only thing you'll get is people saying how big the VN heads are, and carry on about the torque off idle nonsense.. But, apparently Holden back in those days of the VN 304 revision were morons and they should have kept the HQ style head... I've had people say that to me, and I laughed at them...

  13. #13
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    Quote Originally Posted by Adam76 View Post
    Thanks HQ308ute, can you make the early Holden has flow as good a the VN heads? Would it be cost effective? Thanks Adam

    Sent from my SM-T355Y using Tapatalk
    What they said.. but you can get the vn heads for a couple of hundred bucks.. if you're going to rebuild anyway save 800 bucks, but this is me, get the whole 304 if you want... i'd keep that other motor if its the original though... believe me i'm a member of clubs etc.. there are numbers ball breakers out there everywhere.
    Last edited by HQ308Ute; 18-06-2019 at 09:00 PM.

  14. #14
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    Quote Originally Posted by HQ308Ute View Post
    believe me i'm a member of clubs etc.. there are numbers ball breakers out there everywhere.
    Its not their car though, and its not like these normal taxi versions are anything special like GTS,SLR,A9x etc...

    The Chrysler guys are the worst, I would love to take this Charger and put in a small or big block chev, maybe a Ford Barra, coyote 5.0.. The ultimate slap in the face. Or in a Holden... 5.0 Coyote in a HQ, or a f-cking Barra 6 how are those date codes working then...

  15. #15
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    in my experience the Chrysler guys are the worst for originality..they can recite every bloody part number.. is that what your saying? one case not to long ago.. i repaired the front end on CL Regal, all new clips in the engine bay the works.. he goes over it with an eagle eye nodding his head, pops the bonnet and goes.. wheres the clips? i said what do you mean.. right there.. he goes "no the old ones" i said mate they were all rusted ive put new ones in... "oh no he goes where are they? i said in the bin bruv.. next thing you know he's going through the rubbish box looking for them.. no shit.

    I sold a VK i'd built for my nephew years back.. it has a supercharged v6 in it but the guy was more interested in the appropriate numbers vk v8 gathering dust in the corner.. it was ****ed with bottom end knock and top end noise.. i'd bought the car years ago thrashed out back when vt's first came out.. wouldnt buy it without the donk.. can give you a shitload of cases..
    I know its not their car, and he can do what he pleases.. put a barra in it lol or a rotary haha, is that your point? still for good resale it'd be good to keep that motor in the corner of the shed gathering dust.
    but yeah up to the OP
    Last edited by HQ308Ute; 18-06-2019 at 11:09 PM.

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