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Thread: 292 Chevy 6

  1. #1
    casual poster motec6.9's Avatar
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    Default 292 Chevy 6

    Hi I have bought a 292 from Gumtree to fit to my Kommando Wagon. Will have it pulled down next week to start rebuild. Bought lump kit and 1.94 inch valve kit with roller rockers today from the states. Going to fit Ross forged 10 to 1 pistons and waiting to hear about longer rods being available. Target around 340 to 350hp so should make it fun. Will post pictures once I start.

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    casual poster motec6.9's Avatar
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    Ok these are the lumps and what they look like installed. Plus 1.94 inch undercut intake valves and 1.6 inch exhaust plus 1.75 ratio comp cams rockers.

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    Years ago a mate fitted a 292 to his UC Torana.

    It had a Duggan head and was so tall the valve cover hung out the bonnet, along with the manifold and entire carby !

    I will say it had impressive torque and went really well.

    The only downside was keeping the balancer and flexplate attached to the crankshaft.

    Good luck with it !

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    casual poster motec6.9's Avatar
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    The Kommando Wagon is factory fitted with a 250 Chevrolet 6 that's why I want to keep the Chevy 6 in the car. As for the Duggan head they are made by Sissell in the US now start at $3500 US . Who knows may go down this path later. The 292 is 1 1/4 inches taller than the 250 6 . There are after market balancers and flex plates available now so hopefully that's not going to be a problem. Just want a different engine this time. Common sense is fit LS or SBC but that's been done .

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    Do you ever leave? HPE PETE's Avatar
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    subscribed.....what a cool build thread, back in my 6 cyl days i wanted to build one of these "swollen red motors", looking forward to the progress

    will there be any further port work flow testing etc....i like the lump kit

  6. #6
    casual poster motec6.9's Avatar
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    Will do it and let you know plan is a 350hp street engine . Well at this stage anyway. As for the maker off the lumps it Tom from Autowerks in U.S.A . Hes claims the head flows 240-250 cfm with the lumps installed and around 300-310 with larger valves I have bought with mild port work. We will see. Waiting to be advised about longer rods from Tom to use the lighter Ross forged 250 piston it weights 443 grams . 292 Ross piston weights 542 grams and factory is around 300 above that. Here is a 250 from Tom on the dyno all specs listed .https://www.youtube.com/watch?v=1p3-cAJrLCw
    Last edited by motec6.9; 28-06-2015 at 10:03 PM.

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    casual poster motec6.9's Avatar
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    Ok I picked up the 292 this morning from guy I had purchased it from and had it delivered to engine builder . Car will be going to them next week so we can dummy fit the 292 to check everything fits . Then engine build will commence.

  8. #8
    casual poster motec6.9's Avatar
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    Ok engine has been pulled apart waiting for parts from the US. I have ordered 60 over Ross forged flat tops for long rods which have been ordered they are 7.130 in length. And this is the cam spec I have ordered.
    218 degrees duration @ .050 lift
    .528 lift at valve
    110 lobe separation.
    I will upload pictures when parts arrive. Going to fit 4 barrel intake with either FAST or MSD efi.

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    casual poster motec6.9's Avatar
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    While I am still waiting for engine parts to arrive from the US. I bought this from Rocket Industries on Monday arrived Tuesday. Its a MSD Atomic 4 barrel master EFI kit. So that's fuelling taken care off.

  10. #10
    Part of the furniture J.A.W.'s Avatar
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    Have you got a decent fuel distribution non-stove material inlet manifold - to bolt that beauty to - M-6.9?

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    casual poster motec6.9's Avatar
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    Hi J.A.W yes I have a Clifford 4 barrel inlet manifold coming as well as extractors. Engine will be mid 300hp range and able to handle NOS . Should I go that way .

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    casual poster motec6.9's Avatar
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    I intend to flow the heads and will dyno engine once in the car. As for future plans may buy a Sissell 12 port head which is theod Duggan head for the Chevy 6 as they bought the molds. They are 3500 US to buy.

  13. #13
    Part of the furniture J.A.W.'s Avatar
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    What kind of exhaust manifold are you going for M 6.9?

    Did the factory offer a cast split system equivalent to the local Holden 6 X2/S set-up?

    Or does the US aftermarket do a dedicated tuned length extractor/header set?

  14. #14
    casual poster motec6.9's Avatar
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    Hi J.A.W both answers are correct . Will post picture of what I have bought I am after a retro look trying to make it appear stock .

  15. #15
    Part of the furniture J.A.W.'s Avatar
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    Good stuff M 6.9,
    & most likely the GMC 6 nuts stateside have worked out crank flywheel dowel & snout damper fixes for these beasts..

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