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304 budget rebuild - guaranteed to make you cringe

Discussion in 'V8 Development and Modification' started by EYY, Jun 15, 2017.

  1. afstruct

    afstruct Well-Known Member

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  2. EYY

    EYY Well-Known Member

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    Realistically, I think it'll produce around 180-190rwkw tuned correctly and shouldn't need to rev the hell out of it either. Keeping in mind this is my daily so it needs to be reliable and easy to live with in heavy traffic.

    Saw an early Commodore with a stock vt 304 do around 170rwkw with just exhaust and tune on ace performance's Facebook page. Apparently the roller cam really makes a good difference.

    I'll be fitting the starr to the car with existing engine shortly. I've never tuned before (apart from lpg injection), so don't want to be trying to learn on a fresh bottom end. This way I'll be able to get it set up for the 90mm throttlebody (sort shift points, fuelling, ls2 MAF etc) prior to putting the 'rebuilt' engine in.
     
  3. EYY

    EYY Well-Known Member

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    Sandman linked me to a TP dual plane yesterday, and I'm going to pick it up tonight. That's not for this engine though - that'll be going in the ute. It's had injector holes drilled, and I'm interested in having a crack at 4bbl injection too but that's going to have to wait till this engine's sorted.

    I've also come across another decent roller cam for $400 which has only done dyno time. This one's 222/222@.050, .506" valve lift on 112 centres from clive cams. May be a little more suitable with the higher compression - and may need to use the hi-stall for this one!

    As a side note, I've received my NVRAM I purchased on pcmhacking (thanks biggvl!) and plan to fit the starr manifold to my current engine to try to get the tune sorted for that engine with the larger 90mm throttlebody, particularly in terms of shift points. Been doing heaps of research on that, but there's not a huge amount of info on tuning the maf based systems. I think I'm starting to get my head around it though.

    So many options now...
     
    Last edited: Feb 19, 2018
  4. EYY

    EYY Well-Known Member

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    [​IMG]

    [​IMG]

    Picked it up tonight. The bloke who owned it snapped a bolt off where the fuel rails bolt on which is part of the reason I scored it for $350. Shouldn't be too difficult to fix it.
     
  5. gtrboyy

    gtrboyy Active Member

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    Prefer single plane byt for $350 with injector bosses done can't go wrong.

    Trying out bolt-on elbow with std throttle body or going 4bbbl style?
     
  6. Deuce

    Deuce Super Stock

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    Are you going to knotch that centre divider down a little??
     
  7. EYY

    EYY Well-Known Member

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    If all goes ahead it’ll be 4bbl style. Too many projects on the go currently haha.

    I wasn’t planning on it, not sure whether it’s as much of an issue since it’d be port injection? Could always add an open spacer to open the plenum a bit and see what happens. Adding a 1” spacer on my current engine made a huge difference, so obviously it needed it.
     
  8. gtrboyy

    gtrboyy Active Member

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    Too many projects? We both got issues man!

    Just added another vs 5 litre to the collection...

    Curious which 4bbl throttle bodies work without tps or other issues?
     
  9. wraith

    wraith Hand over the dog bikkies

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    EYY likes this.
  10. EYY

    EYY Well-Known Member

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    You and me both... don’t ask me how many vs’ I have lol

    Thinking I’ll probably just try one of the 1200cfm procomp ones. I know people will hate me saying that but I’m willing to take the chance with one.

    They have provisions for tps and iac. Pretty sure the stock units will work with this throttle body.

    Cheers man. I read through half of that thread last week. Also been through @immortality ‘s thread on pcmhacking I came across while I was searching for info, but still looks like the 4bbl conversion hasn’t been completed yet?
     
  11. wraith

    wraith Hand over the dog bikkies

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    Clubby was done and dusted. Needed final tuning but never got around to it. Did a lot of things people didn't think of or maybe care to do like retaining factory throttle cable and PCV.
     
  12. immortality

    immortality Moderator Staff Member

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    Mines not done, got side tracked and just recently bought a house so my funds have been tied up elsewhere. It's pissing off the missus no end though.... Funnily enough all the hard stuff is done, it's all the fiddly stuff, using non standard fuel rails created much more work/cost than intended.
     
  13. EYY

    EYY Well-Known Member

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    Bought a more suitable roller cam for this engine the other day for $100.

    It’s a Crow 4903.
    222/217@.050, lift:548/548, 112lsa.
    Advertised duration 285/279.

    Should be a little more suitable, but means I’ll need to get some of those +.050 valve locks/springs etc. Should be okay with the stock stall. Looks like it should be a little nicer than a 284?

    Longer intake duration should help it breathe a little better with the long intake runners of the bananas in theory...
     
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  14. EYY

    EYY Well-Known Member

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    Update. Bought some NOS 1.49” pin height pistons for $200... just waiting for them to arrive. New crank is $430 from vpw and balancing another $300 or so.

    Could make for a very cheap stroker...
     
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  15. Deuce

    Deuce Super Stock

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    What stroke and rod combo will you use for a. 1.49" pin height?
    Isn't 355 with 6" rod 1.125, so 355 on 5.7 is 1.425" ?
     
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  16. EYY

    EYY Well-Known Member

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    Will be set up as per the factory stroker with stock spike rods (5.625”), so will be pretty much right on 350ci with standard bore size. The pistons do have a 20cc dish though like the factory setup, but with vt heads and the deck height as it is, should pretty easily achieve 9.5:1 after taking a skim off the heads
     
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  17. Deuce

    Deuce Super Stock

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    Oh cool. That makes sense.
     
  18. EYY

    EYY Well-Known Member

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    [​IMG]

    VPW had a sale, crank was about $390
     
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  19. immortality

    immortality Moderator Staff Member

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    That's a bloody steal. Good score.
     

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