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  1. #1
    Casual Smoker V8ME's Avatar
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    Default Will zero decking a 304 block with stock pistons be any advantage

    Thinking of building a real budget motor for my car as I have a kid on the way so anything decent will be years away now. I want to just do a quick hone and new rings bearings etc and cam, anything will probably be better than what's in it now, so will zero decking engine with stock pistons and shaving heads a bit give decent compression for a decent cam? Doesn't matter if it's a hand grenade cause I got a couple motors lying around so I won't get stuck with a buggered motor and none to replace it.

  2. #2
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    hi
    need to no all the stats
    gasket thickness
    gasket diameter
    measured chamber size
    bore and stroke
    beaware of the original compression so u no if changes are worth while

    all this trouble is not worth anything if the bores have NOT BEEN measured , if they are worn close to max its not worth doing .
    If the bores are OK when measured a proper hone at a machine shop is a good idea for good ring sealing .

    Major re ring kit is all u will need , rings ,b/end brgs , mains brgs gaskets and get some welsch plugs to

  3. #3
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    As above you need the figures and do the maths.
    But basically yes, for a decent cam you want the right compression. (and a decent exhaust and tune)

  4. #4
    Part of the furniture gtrboyy's Avatar
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    Dished pistons that are decent drop from deck height probably easier to do kamikaze heads shaved to markers although suspect end up costing near enough to cheap flat tops.

    Problem is that with n/a 304 you need highest compression you can get in order to make most other mods especially with single plane & efi heads.

  5. #5
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    If bores are fine after a quick hone, then yes it's worth it If u can it done cheap enough.
    A mates cheap ass combo...
    Vr 5l, pulled apart and cleaned up, new rings and quick hone. New bearings and a couple little oil mods, milled heads I think 40thou gave about 10.1 with zero deck stock bottom. Little solid similar to crane 280 I think. Cost **** all and went hard untill it dropped something from carb into motor, i think, and hurt it.

  6. #6
    Do you ever leave? paulzig's Avatar
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    The cost to deck block and heads the amount needed will be a fair amount, and when you get flat tops one day your compression will be higher still. Get some quotes for decking and go from there

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    Decking cost me $200.

  8. #8
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by RedTaxi View Post
    Decking cost me $200.
    For the block AND heads? You'd need about .030- .040" off the heads too...

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    200 was just to deck the block. Skim the heads was another 120.
    Well worth it to get things bang on.

  10. #10
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by RedTaxi View Post
    200 was just to deck the block. Skim the heads was another 120.
    Well worth it to get things bang on.
    What compression did you end up with using the dishtops? From memory I think the dish was 8.5cc or something?

  11. #11
    254RWHP boat anchor EVL253's Avatar
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    dont forget if shaving that much the inlet manifold is gonna need doing to
    11 second E85 bottle fed boat anchor

  12. #12
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by EVL253 View Post
    dont forget if shaving that much the inlet manifold is gonna need doing to
    Yeah mine had 100thou something taken off... The amount spent on decking and machining manifolds could have got me a turbo and I wouldnt have had to worry about it.

  13. #13
    casual poster TonnerGuy's Avatar
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    Quote Originally Posted by paulzig View Post
    Yeah mine had 100thou something taken off... The amount spent on decking and machining manifolds could have got me a turbo and I wouldnt have had to worry about it.
    Yep with turbos a lot cheaper than they used to be, is certainly worth looking at before doing mad engine mods.

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    [QUOTE=paulzig;740699]What compression did you end up with using the dishtops? From memory I think the dish was 8.5cc or something?[/QU

    Flat tops in a 355. 0.020" off the deck to zero it and just a lick off the heads. 11.5-1.

  15. #15
    Part of the furniture Deuce.'s Avatar
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    Quote Originally Posted by RedTaxi View Post
    Flat tops in a 355. 0.020" off the deck to zero it and just a lick off the heads. 11.5-1.
    What fuel do you run in that?
    I'm sure you told me 10.5 max on bp98 nz fuel in a holden v8.

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