gen vi block ?
Results 1 to 10 of 10

Thread:
gen vi block ?

  1. #1
    Senior Member larryfknrocks's Avatar
    Join Date
    Sep 2011
    Location
    Los Angeles
    Posts
    577

    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.
    Quick reply to this message Reply  

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member mustangmark's Avatar
    Join Date
    Nov 2009
    Location
    california
    Posts
    176

    Default

    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....
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	image.jpg 
Views:	32 
Size:	21.2 KB 
ID:	829281  
    Last edited by mustangmark; 12-28-2015 at 04:02 PM.
    Quick reply to this message Reply  

  4. #3
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,264

    Default

    Did a blown 540 marine engine that made 1020 on pump gas...no problems.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.
    Quick reply to this message Reply  

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member larryfknrocks's Avatar
    Join Date
    Sep 2011
    Location
    Los Angeles
    Posts
    577

    Default

    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
    Quick reply to this message Reply  

  7. #5
    Senior Member Jetdream'n's Avatar
    Join Date
    Sep 2009
    Location
    Concord, NC
    Posts
    330

    Default

    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
    Quick reply to this message Reply  

  8. #6
    Senior Member Bubbletop409's Avatar
    Join Date
    Jan 2008
    Location
    Castro Valley, Ca.
    Posts
    1,388

    Default

    A Dart Big M after market block is built on the Mk IV foundation, much stronger than a GM Mk IV.
    Larry

    62 Bel-Air 409

    260 Eagle XP HP500EFI

    2016 Corvette Z51

    79 Cole TR-2 Sunset Racecraft 565 (RIP Tracy)

    Remember in November

    Well done USN Seal Team 6
    Quick reply to this message Reply  

  9. #7
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,264

    Default

    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.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.
    Quick reply to this message Reply  

  10. #8
    Village Idiot fc-Pilot's Avatar
    Join Date
    Jan 2008
    Location
    Peoria, AZ
    Posts
    3,268

    Default

    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
    Quick reply to this message Reply  

  11. #9
    Senior Member Jetdream'n's Avatar
    Join Date
    Sep 2009
    Location
    Concord, NC
    Posts
    330

    Default

    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.
    Quick reply to this message Reply  

  12. #10
    Senior Member jetjunky's Avatar
    Join Date
    Jul 2008
    Location
    Diamond Bar, Big River
    Posts
    1,145

    Default

    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.
    Quick reply to this message Reply  

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95