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Thread: Need feedback for head port sizes !

  1. #1
    Senior Member
    Join Date
    Feb 2005
    Location
    Montreal, Canada
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    827

    Need feedback for head port sizes !

    Hi,
    I'm in the final stage of gathering parts for my engine build. I will have the heads at the machine shop next week. I read almost everything ; here, Pelican, books,... and talk with builders ; but I'm taking a last chance to get your comments !

    What will be the best heads port sizes for the following engine ?

    2.7l (90x70.4) 7R case, PMO 40mm, Rennwerks Twin plug dist, JE pistons 10.5:1 CR, 46/40 valves (2.4T heads) MSD, DC60 cams, SSI, 2 out sport muffler, stock rods : red line at 7300 or so.

    It will be a High Performance street engine in a stock body 70S, (but with all the upgrade : polybronze, monoballs, 21-26 tbars, 19/19 Torsion, Koni, Zimmermann, ...)

    I was thinking 36/36 ; will it be too small ?? but I would like to maintain good torque curve at low rpms... YOUR RECOMMENDATIONS ??

    Thanks for you time and advice !!
    Regards
    JD

  2. #2
    Senior Member CamBiscuit's Avatar
    Join Date
    May 2006
    Location
    Adelaide, Australia
    Posts
    1,447
    JD Steve Weiner did the heads for my 2.3 twin plug motor and mentioned flow was very much related to port shape and not so much port size.

    You might want to give him a call, here's how mine look.
    Attached Images Attached Images  
    Looking for engine # 6208151
    '74 RS 3.0 Replica
    '70 911E Bahia Red (SOLD)
    '71 911 S/T Replica 2.3 Twin plug BEAST (SOLD)
    Australian TYP 901 Register #78
    Early S Registry # 1076

  3. #3
    Defender of the Normal John Fusco's Avatar
    Join Date
    Apr 2004
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    1,925
    Quote Originally Posted by Cam Arnott View Post
    JD Steve Weiner did the heads for my 2.3 twin plug motor and mentioned flow was very much related to port shape and not so much port size.

    You might want to give him a call, here's how mine look.
    That pic makes me horny

    Du must schwein haben

    901/05 #305701

    Bultaco Metralla 62 M8
    1968 BMW R69S

    Early911SReg #606

  4. #4
    Senior Member CamBiscuit's Avatar
    Join Date
    May 2006
    Location
    Adelaide, Australia
    Posts
    1,447
    Thanks John

    Kind of peels my banana too!
    Looking for engine # 6208151
    '74 RS 3.0 Replica
    '70 911E Bahia Red (SOLD)
    '71 911 S/T Replica 2.3 Twin plug BEAST (SOLD)
    Australian TYP 901 Register #78
    Early S Registry # 1076

  5. #5
    + 1 on Cam's comments.

    ps Cam, I've now got some heads just like yours :-)

    cheers
    Jeff Eelkema
    69E (project)
    S Reg #1431
    Aust TYP 901 #132

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