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  1. #16
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    Thanks allports, the speed pro seem like a decent piston. Does anyone know where they are available from?

    I had a guy from ACL Ring me just then, and he was really helpful. He suggested talking to local machine shops, however, the only ACL product which was useful was the 8MKRY9355, although he said it would only give approx 9.3:1 comp. I was pretty impressed with the support i got from ACL, and would highly recommend them to anyone.

    I have also just rung pro-stroke and COME.

    Both were very helpful.

    Prostroke have SpeedPro pistons available in both flat top and dish top(12.5cc dish) which give approx comp ratio's of 10.3:1 and 9.0:1 respectively, with standard EFI heads. Looking at roughly $400 inc gst for pistons and rings.

    COME didn't have any cast/hyper pistons, as Keith Black has changed its manufacturer from USA to Mejico, so they were only able to offer Probe forged pistons, which were $770 inc gst. However, they were very helpful. They also said that the block would not be standard bore, so i will have to measure it, and see what oversize it is.

    So i will now have to get the rotating assembly rebalanced, unless the very unlikely possibility of a completely different piston weighs the same happens.
    Last edited by mulkers; 10-12-2008 at 03:47 PM.

  2. #17
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    I spoke to a mate today, who is an old school mechanic from way back. Top bloke, and knows a couple of things about holden v8s too.

    He suggested sleeving the bores of the cylinders that are scored.

    If done correctly, it will save me the cost of boring, pistons and rings, rebalancing, and all the other machining involved. It would work just as well, while saving .010" of precious heat sinking block .

    At the moment, things are pretty tight, so i am looking to overcome this problem in the most sensible and cheapest manner, without taking shortcuts, as like i said earlier, the poor man pays twice.

    I think i will put off a change to a larger cam until further down the track too.
    Last edited by mulkers; 11-12-2008 at 09:36 PM.

  3. #18
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    Sorry to say this but there is nothing wrong with those pistons, it has not dropped them and most times there is is a reason why it picks on the rear piston, tune maybe some gas was chucked in etc

    Maybe you should find out on why those marks are in the bore

    And get it honed out with a new set of rings,

    Thats on the cheap

  4. #19
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    Yeah, i spoke to a mate who knows a few things, and he had a poke at it. He said it was pretty normal sort of wear, and should come up with a hone and new rings, so i am going to take the motor to a machinist, and get a quote/get it done

  5. #20
    Do you ever leave? Brettly-2008's Avatar
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    I'm currently piecing together a 355 short with ACL Race Series8MKRY9570 with 15.4cc and VN A9L rods. The long will have lightly modified VP heads and stock (port matched) VP induction.

    The heads will cop a shave as I'm chasing 10:1 comp also.

    Cam's the next step. Any advice for 355ci hydraulic cam working with stock rocker gear, stock converter through a TH700 trans in an HQ ute and 10:1 comp? It'll be a weekender with bulk streetable torque the main goal.





  6. #21
    Do you ever leave? CNCDAVO's Avatar
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    There is and acl with a 16cc dish
    the ones i use are for 5.625 holden rods
    MCE got a part number the only ACL pistons on there web site for the Holden rod have a 15.4 cc

    ACL Race Series - Holden 5.7L Stroker Cast Piston (8MKRY9570)

    These the ones?

  7. #22
    Senior Member MCEcomp's Avatar
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    Yes they are the ones

    I ve made over 460HP on those and have a stroker that runs 10s and turns 7000 with those pistons
    Superflow 902 Dyno service CALL 0425717668

    3370lb HG prem 9.72@138.4
    390 chev N/A 23deg heads

  8. #23
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    Quote Originally Posted by Brettly-2008 View Post
    I'm currently piecing together a 355 short with ACL Race Series8MKRY9570 with 15.4cc and VN A9L rods. The long will have lightly modified VP heads and stock (port matched) VP induction.

    The heads will cop a shave as I'm chasing 10:1 comp also.

    Cam's the next step. Any advice for 355ci hydraulic cam working with stock rocker gear, stock converter through a TH700 trans in an HQ ute and 10:1 comp? It'll be a weekender with bulk streetable torque the main goal.
    Without a converter, it would have to be a girly little cam

    A 276 crane or similar i would think

  9. #24
    Do you ever leave? stroker355's Avatar
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    Quote Originally Posted by Brettly-2008 View Post
    I'm currently piecing together a 355 short with ACL Race Series8MKRY9570 with 15.4cc and VN A9L rods. The long will have lightly modified VP heads and stock (port matched) VP induction.

    The heads will cop a shave as I'm chasing 10:1 comp also.

    Cam's the next step. Any advice for 355ci hydraulic cam working with stock rocker gear, stock converter through a TH700 trans in an HQ ute and 10:1 comp? It'll be a weekender with bulk streetable torque the main goal.



    Could go as big as 223 @ 50

  10. #25
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    Just a little update for anyone that is interested;


    I have decided to keep the pistons that i have. I have taken the engine to a few people who know what they are doing, and the say it will come up fine with a hone, i think i was a little to worried over something so small.

    I bought some heads (standard VN) and manifold(s) (again, standard bananas) as well as a 70mm throttle.

    I am buying springs, collets, retainers and valve stem seals at the moment.

    I am pretty sure that this is a list of things that i need:

    Distributor, plugs, leads. (will use one of the coils i already have.)
    New extractors
    Bolts, other odds and ends
    New balancer (any ideas or recommendations?)
    Gaskets
    Rings
    Bearings
    Water pump
    Rocker covers and engine covers
    Fuel rail and reg
    Injectors

    Get crank, rods, block, heads hot tanked, chemically cleaned, and crack tested.

    Is there anything it seems i haven't covered?

    Sorry for the very amateur questions and observations, i am sort of new to this
    Last edited by mulkers; 20-01-2009 at 06:11 AM.

  11. #26
    Do you ever leave? CNCDAVO's Avatar
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    No mention of an oil pump, worth the investment.
    I was reading last night that COME recomend the VN harmonic balancer, there is also a wide range of after market ones.

  12. #27
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    It already has an oil pump, with COME modifications, thanks for reminding me.
    By 'VN harmonic balancer', do you mean the standard one?
    Last edited by mulkers; 21-01-2009 at 04:44 AM.

  13. #28
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    If you go to holden and buy a vn harmonic balancer, they will tell you thats its the same as for the HQS thru to HZ. all the same as far as I know, when you buy stock replacment.

  14. #29
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    In the COME section on strokers.

    "Brand new VN commodore harmonic balancer, this excellent moulded and bonded peice simply wont slip the outer ring like your typical pre fuel injection pieces"


    From The esential Holden V8 engine manual by Larre O'Tool

  15. #30
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    crane 230 cam with srp's the stall ur using suits that cam and would make a good combo, and a powerbond balancer
    Last edited by hsvash84; 24-01-2009 at 01:32 PM.

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