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Thread: PRC LS3 250c Cylinder Heads

  1. #11
    Addicted Member Matt82's Avatar
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    You Mods are having too much fun.
    RIP Charlie!

    2009 MGM G8 GT
    Vararam, PaceSetter, Magnaflow, Comp, Pac, Yank
    11.95 @ 116.64

  2. #12
    Addicted Member RichsGreyGT's Avatar
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    UPDATE:

    These aftermarket cast heads must be paired up with the cam. my car was fast with them and the Livernois Stage 1 but I just paired them with a PatG spec'd cam.


    Its a new world.
    MGM '09 G8 GT, RCR tuned, RCR cam (223/231 .625/.622 111+0 ), PRC 250CC heads 65cc chambers, RCR "ram air" intake, & ported TB; Spectre 102mm MAF/LS7 card, HSRK, DT headers, Vararam with RCR type air wedge, Solo Mach CB, 3.45 gears & Yank 3200SS stall

  3. #13
    VIP Member cynic783's Avatar
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    What size chamber did you go with? Also, did you go hollow intake valves.
    2009.5 G8 GXP White Hot 6M, Heads/Cam/Intake/3.91
    515rwhp/477tq SAE Dynojet
    7.518@93.48 1.63 60' +1072 DA (1/8 mile)
    11.815@118.85 1.83 60' +364 DA (1/4 mile)
    CBI Street Cars
    DSX Tuning
    danlewisracing.com

  4. #14
    Addicted Member RichsGreyGT's Avatar
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    Quote Originally Posted by cynic783 View Post
    What size chamber did you go with? Also, did you go hollow intake valves.
    65CC chambers. I don't think I upgraded to hollow stem stainless.
    MGM '09 G8 GT, RCR tuned, RCR cam (223/231 .625/.622 111+0 ), PRC 250CC heads 65cc chambers, RCR "ram air" intake, & ported TB; Spectre 102mm MAF/LS7 card, HSRK, DT headers, Vararam with RCR type air wedge, Solo Mach CB, 3.45 gears & Yank 3200SS stall

  5. #15
    Beyond Help DavesG8GT's Avatar
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    Yea Richards car whips mine now. Those PRC heads just really like high lift.
    The Livernois stage 1 cam just wasn't aggressive enough for those heads, primarily on the lift side of things.
    Get it to the track Pee Wee!
    New (cheap monthly payment car, lol): '12 Candy Apple Red Mustang GT 5.0 6MT, stock for the time being

    **SOLD **
    White Hot '09 G8 GT, Pat G tune, Pat G cam (.634"/.608", 223/230, 112 + 2), G8-4-Speed ported & milled heads, "ram air" intake, & ported TB; Reckart 90mm MAF/LS7 card, HSRK, DT headers, Rotofab, Magnaflow CB, H & R springs, stock gears & stock stall, 11.865 @ 120.32 mph, 1.941 sec 60'

  6. #16
    Senior Member Tommy G's Avatar
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    Just got a used set of these heads. They came with Manley solid valves and new seals. Any recommendations for this setup? I already have a mild cam, VMS 1.5 cam, it is a high lift med duration setup. What valve springs should I get?


    2012 G8 GONE Bracket Champ!

    2008 Liquid Red G8 GT-VMS stage 1.5 cam & Pat G tune, Kooks 1 3/4" LTs w/cats to Corsa catback, VCM intake. 427RWHP, 401RWTQ
    Eibach springs, FE3, BMR Sways, links & toe rods
    Audison Bit-One, JL Audio-500/5, 500/1, ZR800, 10w3v3(x2), Boston Z6, JHP Triple gauges
    TSW Indy 500 staggered w/Nitto Invo (285 rear), GXP diffuser, Roto-Fab engine covers

  7. #17
    Beyond Help
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    Quote Originally Posted by G8-4-Speed View Post
    I think I heard some "dave" guy taunting you to "BRING IT!" ...just saying......
    Instigator! :-)
    2009 G8 GT
    628.5 RWHP on gasoline​ ---> ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom CTS-V Patrick G Cam Grind / Wiseco Forged Rods & Pistons / Injector Dynamics 85lbs / 4.25" Air Intake Tube / 102mm TB & MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan/ Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads

  8. #18
    Addicted Member RichsGreyGT's Avatar
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    Quote Originally Posted by Tommy G View Post
    Just got a used set of these heads. They came with Manley solid valves and new seals. Any recommendations for this setup? I already have a mild cam, VMS 1.5 cam, it is a high lift med duration setup. What valve springs should I get?
    I just switched to a RCR cam. I will know more when I take to the strip.

    my springs were transferred over from the Livernois Stage 1 DoD kit. dual springs that I think will handle up to .670 or .690 lift. my new cam is only .625/.624 lift

  9. #19
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    Just a thought,how much more torque can a G8GT drivetrain handle? the reason I ask is that used to build Ford V8 and 302 GMC engines the u joints, axles,trannys suffered as did the rear springs that bottomed on a slam shift.

  10. #20
    Addicted Member RichsGreyGT's Avatar
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    I never do any 6-2 downshifts

    If I was to make a run, I would go into manual mode and then WOT

    There are plenty if guys making 430-499rwhp and they don't break transmission or axles

    But like most things, it's luck or unluck of the draw
    Last edited by RichsGreyGT; 02-10-2014 at 12:16 PM.

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