Dart SHP 427 SBC

Discussion in 'High Performance Modifications' started by Sbrown1981, Jan 8, 2018.

  1. Sbrown1981

    Sbrown1981 New Member

    18
    0
    Jan 1, 2016
    Stratford ontario
    Hi guys,

    I have dropped my parts off to my engine builder to start my 427 sbc build. While I was there talking with him he mentioned that with the longer stroke of the 427, a little bit of the piston skirt will actually come out of the bore at BDC which will cause the rings to wear quicker than they would on a 400 build.

    He mentioned a rough number of about 20,000km on a 427 and you may start to use a little oil and notice signs of ring wear.

    This engine will be 90% street driven and 10% quarter mile. For those of you running 427 sbc's how often do you need to rebuild your engines?

    My goal was about 550hp and similar torque numbers but if a 427 is going to be that much harder on the block, piston skirts, and rings I may just stick with a 400..

    Thanks!
    Steve
     
  2. 77 cruiser

    77 cruiser Veteran Member

    486
    14
    Nov 17, 2006
    Frostbite Falls MN
    421 Dyno.jpg 414 3.875 stroke. Or if you go 30 over 421. Mine is at 530+ hp with a Qjet did 551 with a dyno Holley.

    This pull is the Qjet.
     
  3. Sbrown1981

    Sbrown1981 New Member

    18
    0
    Jan 1, 2016
    Stratford ontario
    Thats a strong looking motor! That is maybe a good idea, give you the benefits of a few more cubes, and bit more torque from the longer stroke but likely keeps a piston a bit more in the bore.

    So a 414 would be a 4.125 bore with a 3.875 stroke?
    Do you know how much work you have to do on the block to fit that extra stroke? The Dart SHP says it will fit a 3.750" stroke
    What intake are you running on that?

    Thanks!
     
  4. 77 cruiser

    77 cruiser Veteran Member

    486
    14
    Nov 17, 2006
    Frostbite Falls MN
    The shop I bought the block from clearanced it for me, on this Dart little M it was only one place.
    Have a ported Vic jr, with an adapter for the Qjet. Hyd. roller speced by Chris Straub.
     
  5. Sbrown1981

    Sbrown1981 New Member

    18
    0
    Jan 1, 2016
    Stratford ontario
    Decided to go with a 414 Dart SHP, AFR 210 heads, Hyd Roller, and the Victor Jr. Thanks for the idea I didn't really have that on my radar at all but I am really looking forward to it!
     
  6. 77 cruiser

    77 cruiser Veteran Member

    486
    14
    Nov 17, 2006
    Frostbite Falls MN
    Depending on cam & comp. you should make your goal easily.
    Port the intake though.
     
  7. Sbrown1981

    Sbrown1981 New Member

    18
    0
    Jan 1, 2016
    Stratford ontario
    Is your intake port matched or fully ported? I'm not sure what my builder has in mind but I can run that past him yet for sure
     
  8. 77 cruiser

    77 cruiser Veteran Member

    486
    14
    Nov 17, 2006
    Frostbite Falls MN
    Fully ported. Had Eric Weingartner port it,bought my heads from him too.
     
  9. ProjectCam76

    ProjectCam76 Veteran Member Lifetime Gold Member

    275
    4
    Aug 10, 2015
    Birmingham, Alabama
    Not meaning to hijack the thread but how much difference does that make having fully ported?
     
  10. 77 cruiser

    77 cruiser Veteran Member

    486
    14
    Nov 17, 2006
    Frostbite Falls MN
    I don't know, but the ports on the Vic. I have were small, just a bit smaller than a stock head.
     

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