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Thread: Hey lakes, you still have some pix

  1. #1
    Blown 472
    of your ported heads??

  2. #2
    LakesOnly
    Yeah Blown, here ya go....
    Polished combustion chambers and valve pocket work. Note unshrouding of oversize intake:
    http://www.***boat.com/image_center/...hamber-med.jpg
    SCJ intake port match (for my Offy SCJ T/R):
    http://www.***boat.com/image_center/...flange-med.jpg
    Exhaust port shaping. Note that the thermactor boss was not eliminated but rather reshaped into a vane so as to direct exhaust flow:
    http://www.***boat.com/image_center/...xhport-med.jpg
    Final assembly:
    http://www.***boat.com/image_center/...nstall-med.jpg
    Before this rework, my engine had about 420HP; after the new top end, tunnel ram and headers, output jumped to 580HP. Same cam and shortblock.
    Cylinder head modifications performed by Scott Johnston at:
    http://www.reincarnation-automotive.com/
    Scott is one of the pioneers who spent a lot of time cutting apart D3VE cylinder heads and also porting (researching) these castings over and over on his flow bench so as to unlock their unrecognized potential. Intake flow now rivals that of the early (C8, C9 and D0VE) castings and exhaust flow comes pretty damn close. I believe he spends additional time on the D3 exhaust so as to minimize turbulence, which in turn helps make up for the D3's slightly lower exhaust CFM rating (vs. C8, C9, D0's) on his bench.
    D3's are actually about 97cc and with a stroker producing power to 6500 rpm max they can offer sufficient flow and just the right compression ratio.
    They can also be shaved safely to as little as 88cc's and this offers up a c/r of 11:1 with flat-tops in a 466.
    Scott is currently on porting hiatus until early next year.
    LO

  3. #3
    Blown 472
    Thanks, nice motor you have there.

  4. #4
    LakesOnly
    Blown, whaddya want the pic's for? Doing some grinding?
    LO

  5. #5
    Blown 472
    Thinking about it, and looking at pics of porting jobs as I have been reading up on them and wondering what everyone is doing. thanks agian.

  6. #6
    LakesOnly
    Originally posted by Blown 472
    Thinking about it...
    Do us both a favor and cc a combustion chamber so that we know for sure whether D3's are 97cc's or 92cc's. I'll do the same if I get there before you. (I spent all my time porting aluminum and when it came time to grind cast iron, I just didn't have the patience...or enough bits!)
    LO
    p.s. Scott says his porting style does not benefit from filling the floor of the exhaust.

  7. #7
    Blown 472
    Originally posted by LakesOnly
    Do us both a favor and cc a combustion chamber so that we know for sure whether D3's are 97cc's or 92cc's. I'll do the same if I get there before you. (I spent all my time porting aluminum and when it came time to grind cast iron, I just didn't have the patience...or enough bits!)
    LO
    p.s. Scott says his porting style does not benefit from filling the floor of the exhaust.
    That is too bad as I was kicking around a set of plates that fills the floor. They would go betweend the head and header.
    It seems like in a wide range rpm dealio, ie non drag race leaving on the convertor deal, that less porting is more. Been reading and rereading my smoky yunik book.

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