Check out this CAM!!!!!
03-04-2014, 04:04 PM
#21
When I put the numbers in I got 10* of overlap, maybe I did it wrong? Either way It's just my opinion and liljohn defiantly has more experience than me.
Just trying to learn myself. If the 7.0 LS7 redline's at 7100 (HP peaks at 6300) with a 211/230 @ 120 cam. Why is a 231/237 115 out of steam at 6400 on a 408?
Just trying to learn myself. If the 7.0 LS7 redline's at 7100 (HP peaks at 6300) with a 211/230 @ 120 cam. Why is a 231/237 115 out of steam at 6400 on a 408?
Look at what you put in parenthesis.... horsepower peak at 6300.... Thats out of steam to me. Once it peaks and starts going the other way... its not continuing to make power to 7100... thats just the rev limit.
And you are seriously trying to compare valve events and rpm capability between a square port headed LS7 and a Cathedral headed 408 with an LS6 intake?? The cross section and valve sizes play a big part in where X cubic inches will have X power Peak at X rpm.... a Square port headed motor doesnt need anywhere near the intake valve close point that a cathedral port headed motor needs to get to X rpm for peak power. Thats why it takes more duration for a cathedral head to match Peak RPMs with a square port head. The 2 different heads cam completely different.
03-05-2014, 08:49 AM
#23
Try running the numbers again. 231/237 on a 115 lobe sep is 4 degrees of overlap at .050.
Look at what you put in parenthesis.... horsepower peak at 6300.... Thats out of steam to me. Once it peaks and starts going the other way... its not continuing to make power to 7100... thats just the rev limit.
And you are seriously trying to compare valve events and rpm capability between a square port headed LS7 and a Cathedral headed 408 with an LS6 intake?? The cross section and valve sizes play a big part in where X cubic inches will have X power Peak at X rpm.... a Square port headed motor doesnt need anywhere near the intake valve close point that a cathedral port headed motor needs to get to X rpm for peak power. Thats why it takes more duration for a cathedral head to match Peak RPMs with a square port head. The 2 different heads cam completely different.
Look at what you put in parenthesis.... horsepower peak at 6300.... Thats out of steam to me. Once it peaks and starts going the other way... its not continuing to make power to 7100... thats just the rev limit.
And you are seriously trying to compare valve events and rpm capability between a square port headed LS7 and a Cathedral headed 408 with an LS6 intake?? The cross section and valve sizes play a big part in where X cubic inches will have X power Peak at X rpm.... a Square port headed motor doesnt need anywhere near the intake valve close point that a cathedral port headed motor needs to get to X rpm for peak power. Thats why it takes more duration for a cathedral head to match Peak RPMs with a square port head. The 2 different heads cam completely different.
Yes, got it the first time. Note embarrassed smiley face to emphasize my shame. But thanks for pointing that out….again. Very helpful.
