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  1. #16
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    Just a comment for you all about honing. My engine machinist (one of nz's top race builders) offers torque plate hone for $180 or a hot hone option for $600. Hadnt heard of this myself. Block goes in an induction heater (torque plates on of course) and brought up to normal operating temp, then honed. He reckons the heater sucks power like mad, hence the price. He has put a torque plate honed block in the heater, brought it up to temp and re-measured the bores and they went an average of 0.002" out of round. Food for thought. Obviously a consideration for high performance applications, but hey 2 thou is quite a bit.
    Last edited by RedTaxi; 20-08-2010 at 05:06 PM.

  2. #17
    Do you ever leave? Mickss355's Avatar
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    To balance or not to balance ?
    If the engine was balanced to start with and the pistons are exactly the same weight as the originals (unlikey but not impossible) then you don't need to re-balance !

    It all depends on the replacement piston weights !

  3. #18
    shovel built race engines onlimiter's Avatar
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    if its low hours why does it need slugs?
    freshen up,rings,bearings,cam,lifters,valve cut,etc!
    balancing does not create hp!
    who balances an old build?unless its fresh metal etc!
    dont take offence!
    performance was never mentioned in the original thread!
    rev the chev kev!

  4. #19
    Do you ever leave? Mickss355's Avatar
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    Quote Originally Posted by onlimiter View Post
    if its low hours why does it need slugs?
    freshen up,rings,bearings,cam,lifters,valve cut,etc!
    balancing does not create hp!
    who balances an old build?unless its fresh metal etc!
    dont take offence!
    performance was never mentioned in the original thread!
    He said he was going from dished to flat top pistons !

    In this case, balance and hone should be done regardless.

  5. #20
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    mickss is correct
    im fitting flattops to up the comp so after thinking on it i may as well get it honed ,decked to 0 and balanced while its apart

    now one more q for you guys
    will it cost more to prep a9l rods inc buying them and fitting arp bolts ,resize ect than to just buy the scat rods which should be ready to go

    scat rods are $650 from vpw
    a9l will cost me $200 for used rods ,$120 for bolts plus a resize $? and prep work $?

    cheers

  6. #21
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    Would be much of a muchness in over all cost !
    If you had the A9L rods to start with - then id prep those !
    But seeing as you have to buy them - id go the scat rods !
    Plus they are new - as opposed to old with worst case scenario, "don't know the history and possibly been fatigued"

  7. #22
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    X2 ^^ I will add though, that Although the scat rods I have checked have all been v.good in the big end, the rod end comes "semi finished" & may require machining. Your build parameters are now changing & Since you intend on zero decking the block, new rods etc. What's another few hundred to bore & hone in the build (Which it is becoming) To have a completely fresh engine?

  8. #23
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    hi all
    i wont need to bore it just hone ,its already 30 thou up and being the matching numbers engine to the car its in (lh slr 5000)id like to keep a few oversizes up my sleeve for ron

    im just about to fit a new top end inc crow 5649 cam which to work well needs 9.5 min comp otherwise i would not be touching the slugs
    i have calculated the current comp to be 9.0 so it needs to come up and flat tops are the best way to do it

    ive thought about it and reckon that since its going to be at the machine shop any way i may as well chuck some new legs in her as well just to be safe which is why i asked about the rods and what would be the most cost effective way to do it

    cheers

  9. #24
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    since you are buying pistons anyway, get acl race flat tops for a 304, which have a greater compression height & you won't have to deck your numbers matching block. Using your rods,, reco & maybe balance-- using scat rods,, rods & definitely balance

  10. #25
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    hi mate
    i was thinking about those 304 pistons
    my pistons are .035 below deck , how much higher are the 304 pistons ?

    cheers

  11. #26
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    20 thou

  12. #27
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    0.035'' down seems a lot. I haven't yet come across a GM engine with that much.
    i did a 350 a while ago that the dude broke, & it was Zero deck, Soooo to hurry things along I used an old piston rod assy to do the deck height check set. When he gave me the pistons & they were ready to be trial assembled, low & behold, I thought I had made a mistake. The pistons were sitting out the block! WTF. I then grabbed the old assembly & put it in, guess what? spot on, piston @ zero. So I would check your true compression height on the pistons you have First. Good Luck Mark

  13. #28
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    I have a spare engine sitting here atm its a 304 (5.0 on side of block) std dished pistons , it has .035 deck height on 1 side and .28 on the other , i can't find the made in china stamp but i'll keep looking. lol

  14. #29
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    The last hq block i put together was 35 down

  15. #30
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    hi all
    ive checked the hieght on number 1 cyl which was the .035
    i did not realize that there may be large variations though so i will check the other cylinders tonight

    i have ordered the acl race series 304 pistons and am told by jonny dyno in geelong that .020 is the difference so it works out perfecto

    thanks to all for your help and advice

    cheers

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