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Lower CR heads for blower app,,advise

This is a discussion on Lower CR heads for blower app,,advise within the Internal Engine forums, part of the LSx Technical Help Section category; I have been through the LT1 stage of 383s with superchargers. I have decided to take a different approach this ...

  1. #1
    Junior Member
    Join Date
    Dec 2005
    Huntsville, AL

    1999 WS6

    Lower CR heads for blower app,,advise

    I have been through the LT1 stage of 383s with superchargers. I have decided to take a different approach this time. The LS1 is fairly new to me. What CC heads are on the car and can I get a higher CC performance head to lower the CR to around 9 to 9.5. What cam would be adviced for a blower application in the LS1(I like a little lop'n too). I plan on using the ATI D1SC 8 rib and throw in an extra little boost since the CR will be a little lower. Just want to play it safe. Broke tooooooomany ring land in the LT1s and I dont feel like pulling the motor just yet or anytime soon. I know many of you have been through the learning process the hard way with the LS1's. Hope you don't mind if I can learn from your experiences.

  2. #2
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005

    1999 TA WS.6

    im not ls1 expert but im pretty sure the lq9 heads off the Escalde will lower your CC decently.

  3. #3
    Stock heads are 64cc. AFR has a head that you can get in 66cc or 76cc and will blow away LS6 heads for flow. Go to

  4. #4
    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
    Join Date
    Aug 1999
    San Diego, Ca

    383 Procharged & N20 Vert

    Getting a set of 6.0L heads will drop your CR to around 9.5
    Black 1999 Blown Convertible A4
    Forged 383, ATI D-1SC
    NX MAF Kit | 222/226 .585 115
    AS Stage II 6.0L FI Heads
    Moser 9" | 3.70 | Wavetrac | 35 Spline | Vigilante 3600
    548.0 RWHP - 563.8 RWTQ - 10# - D1

    666.0 RWHP - 734.2 RWTQ - 125 Shot - P1

    Black 2009 Escalade Hybrid 4WD
    Black 2008 GMC Yukon Hybrid 4WD (Totaled)

    Black 2013 Chevy Volt (Gone)

  5. #5
    Junior Member Corvettestripes's Avatar
    Join Date
    Dec 2005

    Corvette C5


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