gen vi block ?
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gen vi block ?

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    Senior Member larryfknrocks's Avatar
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    Default gen vi block ?

    What's the most power you've seen come from a gen vi BBC standard deck block.. At the moment my motor makes 700hp. For 2016 I wanted to wake it up a little more but I didn't want to hurt the block with too much power. Just wanted to see what people thought about throwing a little more power at it because I have some nice parts I can't transfer over to a new mk iv style block.

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    Senior Member mustangmark's Avatar
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    Quote Originally Posted by larryfknrocks View Post
    What's the most power you've seen come from a gen vi BBC standard deck block.. At the moment my motor makes 700hp. For 2016 I wanted to wake it up a little more but I didn't want to hurt the block with too much power. Just wanted to see what people thought about throwing a little more power at it because I have some nice parts I can't transfer over to a new mk iv style block.
    I can't say for sure what kind of power mine makes because I've never had it on a dyno but it's 516cu in (.060 over) with an m3 procharger. I've run it at 8psi and would respectfully say that was around 800hp. My only concern has always been the cylinder wall thickness. It's recommend that the gen6 not be punched out past 0.30 for that reason but I've had no issues in the 3 seasons I've run it since I built it. I run arp main studs, arp head studs, stock crank, Oliver rods, Srp pistons, a Marine Kenetics had roller cam, morel lifters, world products "grumpy Jenkins" heads that are fully ported, a Brodix intake, c&s blow thru carb, msd ignition, lightning headers, a big oil cooler with -12 hoses and an oil thermostat, etc....
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    Last edited by mustangmark; 12-28-2015 at 05:02 PM.

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    steelcomp was here
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    Did a blown 540 marine engine that made 1020 on pump gas...no problems.
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    Senior Member larryfknrocks's Avatar
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    Mine is a std deck 496 so I'm guessing I should just leave it how it is.. I was going to put a little juice to it but I may just put this motor in a street car and start on something new. Thanks for the help guys

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    Senior Member Jetdream'n's Avatar
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    Quote Originally Posted by larryfknrocks View Post
    What's the most power you've seen come from a gen vi BBC standard deck block.. At the moment my motor makes 700hp. For 2016 I wanted to wake it up a little more but I didn't want to hurt the block with too much power. Just wanted to see what people thought about throwing a little more power at it because I have some nice parts I can't transfer over to a new mk iv style block.
    Is the mark IV block a better more stronger design than a V or VI? I've always wondered this

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    Senior Member Bubbletop409's Avatar
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    A Dart Big M after market block is built on the Mk IV foundation, much stronger than a GM Mk IV.
    Larry

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    steelcomp was here
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    Quote Originally Posted by Jetdream'n View Post
    Is the mark IV block a better more stronger design than a V or VI? I've always wondered this
    Both have their strengths and weaknesses. The only real benefit to the GenVI block is the 4.50 bore version. The 4.25 bore version has been known to have thin cylinders.
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    Village Idiot fc-Pilot's Avatar
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    Quote Originally Posted by Bubbletop409 View Post
    A Dart Big M after market block is built on the Mk IV foundation, much stronger than a GM Mk IV.
    Yes and no. The rear seal is a two piece like the mark IV but its oiling is a variation of the two. The oil filter pad is like the mark IV but the priority oiling is like the Gen 5/6. It is the best of both worlds and has the thick cylinder walls like the bowtie blocks. It is the best of all worlds.

    Paul

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    Senior Member Jetdream'n's Avatar
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    Quote Originally Posted by fc-Pilot View Post
    Yes and no. The rear seal is a two piece like the mark IV but its oiling is a variation of the two. The oil filter pad is like the mark IV but the priority oiling is like the Gen 5/6. It is the best of both worlds and has the thick cylinder walls like the bowtie blocks. It is the best of all worlds.

    Paul
    Nice. I have a big M lined up for my next build. Sound like I made the right choice.

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    Senior Member jetjunky's Avatar
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    on new big m's there's a couple things to check/verify. one of which is the oil galley plug hole behind the cam gear. they typically need to be tapped deeper so the plugs don't contact the back of the cam gear. there are a couple more but i'm blanking on them right now. as i recall there was a pretty good discussion here in the past. prolly worth a little research.

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