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Who has LS9 cam dyno graphs with cathedral port heads?

 
Old 03-02-2017, 09:18 AM
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Default Who has LS9 cam dyno graphs with cathedral port heads?

Anyone?

Blower or intake manifold, engine, and compression info if you have it
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Old 03-02-2017, 11:53 AM
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I thought that one of the magazines tested this cam with other OEM cams (probably with stock heads though). I was thinking it did really well. If I ever do a 6.0 turbo setup with 317 heads I was going with this cam.
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Old 03-02-2017, 12:09 PM
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Jeff!!!!! Read your PM brother. Been a while
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Old 03-02-2017, 12:09 PM
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There was a test a while back where a bunch of factory cams was tested on a stock LM7 5.3 engine. The LS9 did well in the higher RPM ranges, but lost a lot of torque under 4000RPM or thereabout. There are far better cams for the 5.3 than the LS9, which would do better in a larger engine like a 6.2, which is the original application with a supercharger.
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Old 07-01-2017, 05:25 PM
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I do, somewhere lol.

Did 250whpish with a 4.8 and 317s, power was still climbing when I let off at 6500. May or may not have been on all 8 cylinders, and chewed up some cam bearings on the way home

And yes, it's like vtec kicked in at 4000to 4500ish
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Old 07-01-2017, 05:34 PM
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They pick up a Lot of power over peak on a cathedral engine, and some peak to peak.
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Old 07-02-2017, 09:50 AM
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Problem is that late IVC is really not a good match for a 5.3 due to its compression. You need to raise static compression to get dynamic compression into the 8's or you need boost. If neither is an option, then there are better cams available.

The right cam is cheaper than a cheap cam that you have to keep doing stuff to make work.
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Old 10-31-2018, 12:14 AM
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Yes, I know but i wanted to see how far back it moves peak with that late IVC to judge where to put something like that on another setup
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Old 10-31-2018, 12:29 AM
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WHOA! Talk about a delayed response.....
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Old 11-01-2018, 01:51 PM
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What the ****
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Old 11-01-2018, 02:52 PM
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Originally Posted by Mavn View Post
What the ****

?????
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Old 11-01-2018, 02:57 PM
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Originally Posted by GrannySShifting View Post
?????
Just a commentary on your MUCH-delayed response to a post...
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Old 11-01-2018, 05:11 PM
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Originally Posted by GrannySShifting View Post
?????
lol because you finally responded to Darth V8r 1 year and 3 months later hahahahahahaha

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Old 11-01-2018, 06:34 PM
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LOL I didnt pay attention to date, Im a very busy person!
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Old 11-01-2018, 08:08 PM
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Old 11-01-2018, 09:12 PM
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I think your missing the point of my question somehow LOL. With a small duration very late IVC i wanted to see where it peaked. only peaked at 6300-6400. prob would little later if it had some compression in it. i need it to peak about 1000 rpm later on a setup with even less stroke, but id say the earliest IVC i would want is what a ls7/9 cam [email protected] degrees
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Old 11-01-2018, 10:52 PM
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Originally Posted by GrannySShifting View Post
I think your missing the point of my question somehow LOL. With a small duration very late IVC i wanted to see where it peaked. only peaked at 6300-6400. prob would little later if it had some compression in it. i need it to peak about 1000 rpm later on a setup with even less stroke, but id say the earliest IVC i would want is what a ls7/9 cam [email protected] degrees
if thatís what you want yup. With the right intake itíll carry forever too
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