L69 Buildup

The baseline motor is a rebuilt L69 305 Q-Jet motor. It should be noted that just switching the intake manifold to an Edelbrock Performer netted a 25 horsepower gain.... Hooker 1 5/8" headers, DynoMax Super Turbo Mufflers, MSD HEI distributor are used throughout the tests....

The Cam Specs: 

PN             Type         Valve Lift    Duration@.050"  Lobe Separation
14088843      GM L69        .403/.415       202/206       115
12-305-2      Pure Energy   .429/.438       203/212       110
12-209-2      Dual Energy   .462/.482       219/229       110

Test 1:

  • Baseline (stock heads), Pure Energy cam with aforementioned constant parts.
  • 199hp@5000rpm and 239lb-ft@3500rpm, idle vaccuum 18"@700rpm

    Test 2:

  • Edelbrock Performer intake & timing change (cheap change - <$200.00)
  • 224hp & 254lb-ft, idle vaccuum 17"@700rpm

    Test 3:

  • World Products 305 Torquer heads (1.94"/1.5" valves, 58cc chambers=9.5:1 CR) no other changes.
  • 237hp & 268lb-ft, idle vaccuum 17"@700rpm

    Test 4:

  • WP heads & Dual Energy cam & jetting changes.
  • 264hp@5500rpm & 272lb-ft, idle vaccuum 12.5"@800rpm

    Test 5:

  • Trick Flow heads (2.02"/1.6", 63cc chambers=9.1:1 CR), Pure Energy cam
  • 256hp & 272lb-ft, idle vaccuum 17"@700rpm

    Test 6:

  • Trick Flow heads, Dual Energy cam
  • 288hp & 290lb-ft, idle vaccuum 12"@800rpm

    The writers thought that by bumping the timing from 34 to 36, retarding the cam by 2 degress, and adding 1.6 rockers that they would approach the 300hp level.

    They also noted that when using the Trick Flow head, exhaust valve lift should be kept below .650" or the valve will hit the wall of the bore. This is not a problem with any street cam. These heads will also save you about 40lbs of weight on the nose of your car.....

  • Back to the main Monte page.