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    1. #1
      Join Date
      Jan 2009
      Location
      Hermosa Beach, CA
      Posts
      153
      Country Flag: United States

      Do all 5.3 engines have catherdral port heads?

      Researching for my LS swap. Im wondering, do all 5.3 truck engines have cathedral port heads? I know the Gen IV engines got rectangular port heads around 2007 on the 6.2 engines but did the 5.3 engines and 4.8 engines ever get rectangular port heads too? Thanks
      Pete

      1968 Camaro
      2009 Porsche 911 Carrera S

      http://www.cardomain.com/ride/2543199

    2. #2
      Join Date
      Dec 2008
      Location
      Detroit
      Posts
      2,584
      Country Flag: United States
      In my years I have never seen a rectangle port on anything smaller than a 6.0 and those were the LY6 truck motors and the L76 motors from the Pontiac G8

      Big dreams, small pockets....

      Chris--
      '72 Cutlass S LSA/T56 Magnum
      Bowler Performance, Rushforth Wheels, ATS, Holley EFI, KORE3, Ridetech

      Project Motor City Madness


    3. #3
      Join Date
      Nov 2014
      Posts
      233
      Country Flag: United States
      Chevrolet LS rectangle port heads need at least 4.00 bore. 5.3 and 4.8 are 3.78". LS7 heads require even larger.

      There are several aftermarket manufacturers that offer other solutions

    4. #4
      Join Date
      Jun 2010
      Location
      Deployed
      Posts
      3,280
      Country Flag: United States
      All 4.8s, 5.3s, and 5.7s came with cathedral port heads. Like mentioned, the square port heads were not put on any engine with a bore smaller than 4”
      1970 Camaro/DSE build


      Are you driver enough? Maybe....come on blue!
      https://www.pro-touring.com/threads/...71#post1147371

    5. #5
      Join Date
      Jan 2009
      Location
      Hermosa Beach, CA
      Posts
      153
      Country Flag: United States
      Thanks everyone
      Pete

      1968 Camaro
      2009 Porsche 911 Carrera S

      http://www.cardomain.com/ride/2543199



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