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Thread: Eaton pulley combo for pump gas

  1. #1
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    Eaton pulley combo for pump gas

    I built engine with 4032 flat top pistons, roadrunner rods and the stock crank.

    My eaton came with a 2.76 inch pulley on it, which I do not plan to use. I bought a -2 lb lower pulley with the intent of finding a 3.4 inch upper pulley to net around the stock boost level. I'm having trouble finding a 3.4 inch pulley now, so I'm looking at other options. Anyone out there having success with a 3.1 inch pulley and -2 lb pulley, running 93 pump gas? I have a calculated 10.7:1 static compression.

    I think a 3.1 and -2 lower equates to about a 3.4 upper and the stock lower pulley. Open to all your experiences to ensure I put the right pulley on this.

    Sent from my SM-G930U using Tapatalk
    2003 Marauder 300A
    #2928 of 7838
    Build date: 8/6/02
    Ship date: 5/28/03
    14.33 @ 96.82 with OLD engine
    6R80 swap in progress

    1968 Chevelle
    NA/Pump Gas 10.4 @ 128 mph
    416/4L85E LSA Supercharged build underway

  2. #2
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    Probably wont help but just FYI, Im running a +2lb lower and stock 3.6 upper with a Stiegemeyer Stage 6 port and Stainless Works long tubes and it makes ~11psi with a stock motor.
    2004 Silver Birch w/moonroof. "Isabelle"


    Eaton swapped summer/fall 2015 with all the gooddies, tune by the one-and-only Marty-O +2psi pulley, Steigemeyer stage 6 port, SWLT, custom ss exhaust, Borla ProXS, Addco sway bars, TCE s/s brake hoses, Hawk HPS pads, Zack big brak kit, J-mod, battery in trunk, full custom audio (never used, blower whine sounds better)

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  3. #3
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    Quote Originally Posted by dmjarosz View Post
    Probably wont help but just FYI, Im running a +2lb lower and stock 3.6 upper with a Stiegemeyer Stage 6 port and Stainless Works long tubes and it makes ~11psi with a stock motor.
    Great info. Are you running pump gas?

    Sent from my SM-G930U using Tapatalk
    2003 Marauder 300A
    #2928 of 7838
    Build date: 8/6/02
    Ship date: 5/28/03
    14.33 @ 96.82 with OLD engine
    6R80 swap in progress

    1968 Chevelle
    NA/Pump Gas 10.4 @ 128 mph
    416/4L85E LSA Supercharged build underway

  4. #4
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    West 'burbs Chicago
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    3,801
    3.1 upper and stock lower yields about 11psi here, was on factory compression, but now will run a bit less after rebuild.
    -----------------------------------------------------------------------------------

    '04 Marauder #357 of 3213 - Eaton swapped - "MERCD U"
    '15 Mustang GT, performance package
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  5. #5
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    Quote Originally Posted by ChiTownMaraud3r View Post
    3.1 upper and stock lower yields about 11psi here, was on factory compression, but now will run a bit less after rebuild.
    Nice. I think a 3.2 sounds about right for me then considering I have the under drive lower. Trying to keep it around 8 psi

    Sent from my SM-G930U using Tapatalk
    2003 Marauder 300A
    #2928 of 7838
    Build date: 8/6/02
    Ship date: 5/28/03
    14.33 @ 96.82 with OLD engine
    6R80 swap in progress

    1968 Chevelle
    NA/Pump Gas 10.4 @ 128 mph
    416/4L85E LSA Supercharged build underway

  6. #6
    Join Date
    Mar 2008
    Location
    Next door to my neighbor
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    47
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    19,611
    93 is good to around 19#s Iíve been told. I flirt with 19-21 on 93 almost every week itís driven, but thatís also on a lower compression Cobra block.

    Iíd be more worried about over spinning that roots with a 2.anything upper. My old Trilogy set up was first stock pulleys (yawn) then a 3.2 upper, only 2 psi added but definitely better, finally a 2.8 upper and +4 lower on 93. I pegged my gauge so I upgraded to a 0-30 and saw a consistent 20#s of heat being made and only made 461 over the 3.2/stock lower that made 445 if I recall..

    Iíve never heard of a -2 lower?


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

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