Just Fishing's 09 Tahoe Build thread

[Just Fishing]

Close enough!

Damn. You just made me realize 20+ years of my life have zipped by and just how long gone those good ol' days are.

I remember "Nookie" on Total Request Live like it was last summer. Also, Korn's "Got The Life", that one by that Canadian chick that was in the movie "Titanic" and a bunch of others.

Yup, sounds like you're my age alright.

 

[Just Fishing]

Just had a flash of the crazy girls that have come and gone.

Some i still have fond memories of...

Others, laid the path to what i finally accepted as my life.
Knowing anything even close to them would mean pure hell.
(Not counting them nekkid)

Oh good times overall.



Lesson from those times, i also became a "gun nut" with a carry permit.

Survived thanks to a guardian angel (not kidding).

 

[Just Fishing]

Rascal flats song in my head right now... something like broken road or something... lol

 

[iamdub]

Just had a flash of the crazy girls that have come and gone.

Some i still have fond memories of...

Others, laid the path to what i finally accepted as my life.
Knowing anything even close to them would mean pure hell.
(Not counting them nekkid)

Oh good times overall.



Lesson from those times, i also became a "gun nut" with a carry permit.

Survived thanks to a guardian angel (not kidding).

I went back to my high school days. My brother and I lived in Florida with my aunt cuz she was in the better school district. Plus, she was much better off in life- She had food, her house wasn't roach-infested, it was insulated and had air conditioning and other useful appliances. I remember afternoons after school watching Pop-Up Video and TRL with my cousins, then Figure It Out, Ahh! Real Monsters and Hey, Arnold! during dinner.


...There's so much kids/teens take for granted.

 

[Just Fishing]

got the new ac compressor.
I saw amazon had a price drop, brought it back down to about $138
so i clicked the button.
Received it over the weekend, looks good.
Came in a nice blue GM sealed box.

Matches the images for the newer model unit per gm partsdirect.

 

[Just Fishing]

so i decided to free my new camshaft (12623063) from it's cardboard prison (one well sealed cardboard tube!) and to do some rough measurements.
https://www.summitracing.com/parts/nal-12623063?rrec=true

Found some specs, probably close.
(This camshaft also comes up as the stock camshaft for the 6.2L non DOD escalade)
((Source) https://jankyshack.com/gm-ls-cam-specs/ ))

Also found this one googling the old PN: https://www.hotrodparts.com/rollsbentleyparts/gm-ls3-430hp.htm
Crossing my fingers i make close to 430hp!



()
Camaro LS3 (also 2009 G8)

10-15 12623063 204/211 .551/.522 ???

PART NUMBER 12603844 (replaced by 12623063) – LS3 CAM CARD DATA:
117 LDA, 120 INTAKE CENTERLINE
1.70 ROCKER RATIO Lift: @Cam @Valve Exhaust: 0.306 0.522 Intake: 0.324 0.551
Cam [email protected] Tappet Lift: Open Close Adv. Duration
Exhaust: 66 BBDC 29 ATDC 275 Intake: 7 BTDC 80 ABDC 267
Cam [email protected] Tappet Lift: Open Close Duration
Exhaust: 38 BBDC 7 BTDC 211 Intake: 19 ATDC 43 ABDC 204
()


So when i pretty much gave up last time around, i settled on this camshaft.
https://www.summitracing.com/parts/nal-12689035
(GM PN: 12689035)

Specs,
MPN: 12689035
TYPE: Hydraulic Roller
INT DURATION @ .050": 190
EXH DURATION @ .050": 191
VALVE LIFT INT (IN.): .466
VALVE LIFT EXH (IN.): .457
ROCKER RATIO: 1.7
LOBE SEPERATION: 114



So i took my digital dial caliper and did some rough measurements.
The lift appears to be identical or damn close between the two...
Everything i can find says that that the new camshaft i bought (12623063) has more lift than the old one.


So what I'm wondering, maybe i need to get a 1.8 ratio rocker?
I figure it's in my best interest to get some clay and check valve clearance anyways.
Maybe i'll find there is room for a little more lift.

+ my freshly rebuilt/upgraded factory rockers did see some metal getting inside of the bearings.
(ultrasonic cleaner released quite a bit).

 

[pwtr02ss]

I'm not much help in this department. Sounds like you're on the right track though. If I were building one, I'd get something a little more aggressive than a stock gm cam (If I'm reading your post correctly).

If you're like me and enjoy something on the quieter side, i'm sure there are options.

Here is my avalanche with stock exhaust (Completely stock, manifolds, cats, etc.) with ported 799 heads and btr stage 2 truck cam. I think once I get the tune happy, it'll quite down a lot. I'm not a huge fan of the sound right now....

Dark is right after first start. It had a random misfire on two cylinders that would hit about 20x over the cycle on hpt scanner so keep that in mind

This is after its warmed up and misfire resolved. Completely stock tune...

@iamdub has basically the same cam but has headers and exhaust, if you want to compare what "could be"

 

[Just Fishing]

Yeah, been going back and forth there.
My hope is that i can get away with using a stock tune vs hiring someone to get it running right.

So the logic in my head is that i'm using a tune from a 6.2, camshaft from that 6.2 should make things real easy.

but if i'm not getting much in the way of more lift, then i'm returning the camshaft, or just replacing the rockers to get that lift.

 

[Just Fishing]

Ok i think i just figured it out.



From the above cam specs, noticed the lower number!
Exhaust: 0.306 Intake: 0.324


Note this is real rough, numbers are going to be close but not quite there.
To confirm,

Take my digital caliper
measure the lowest point on the lobe to the base.
number = .115

then do the same on the highest point.
number = .429 (close enough to match the above spec)

Minus .115 from .429
Number: .314

.314 x 1.7 = .533 !
.314 x 1.8 = .565

 

[Just Fishing]

ETA: tried again and I confirmed the old camshaft has pretty much the advertised low lift.
so w00t!

piston, rings, and a bunch of other parts should arrive Wednesday or Thursday.
quick mockup to confirm height, and then off to the machine shop for a balance!