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Discussion Starter #1
has anyone seen the tops of the pistons in a LH8 or LH9 ?
do they have valve reliefs or are they flat tops ?
 

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Don't know how reliable this pic is but it's out of the 2009 GMC Canyon new car brochure. No valve reliefs on this piston.
 

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Discussion Starter #3
Free, is that a real piston out of a LH8 or LH9 ?
or is the 8 or 9 diff from each other ?
 

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The Lh8 in my 09 has flat tops probably due to the swap to the 243/799 heads
 

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Discussion Starter #7 (Edited)
thanks a lot ronvc. whats up with that truck engine ?
 

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Post the full details and final numbers. Please!! Lol
Here is some preliminary details to review, builder suggests we could see ~70 rwhp increase barring any unforseen's.

Part Num Description
AI Heads: 100% CNC'd 226cc GM LS6/LS2 Cylinder Head Package
Advanced Induction - 226 cc GM LS6/LS2 Head Package
Options: Advanced Induction - LSX Heads & Cam Kits
Elec-Fan SuperModulation Model SFAN4500 Electric Cooling Fan (efan)
http://www.355nation.net/forum/sfan4500-electric-fan/19452-supermodulation-efan-model-sfan4500-electric-cooling-fan-kit.html
CCA-156-401-13 COMP Cams XFI SPR GM Gen IV VVT Camshafts [ 214 228 .559 .571 114° ]
Stock --> 191 190 .457 .466 114 --> 559/457 22%, 571/466 22%, 214/191 12%, 228/190 20%
156-401-13 - XFI? RPM HI-LIFT
http://www.compcams.com/Technical/Catalogs/NP2009/pdf/page9.pdf
http://www.summitracing.com/parts/CCA-156-401-13/
NAL-12499225 Chevrolet Performance Hydraulic Roller Lifters
http://www.summitracing.com/parts/nal-12499225
CCA-7955-16 COMP Cams Hi-Tech Pushrods
http://www.summitracing.com/parts/cca-7955-16
CCA-26918-16 COMP Cams Valve Springs (See per AI using PSI 1511 BeeHives)
http://www.summitracing.com/parts/cca-26918-16
PER AI: PSI 1511 MaxLife Endurance Springs
MAN-23622-16 http://www.summitracing.com/parts/MAN-23622-16
PER AI: Manley 23622 Titanium Retainers for beehive springs
CCA-5456 COMP Cams Camshaft Phasers
http://www.summitracing.com/parts/cca-5456
CCA-13702-KIT COMP Cams GM LS Series Retrofit Trunnion Kits
http://www.summitracing.com/parts/cca-13702-kit
12589226 New Cylinder Head Gasket
http://www.summitracing.com/parts/nal-12589226
Top End Kit (Crank Bolt, Crank Seal, Head Bolts, Front Cover Gasket)


325 Chevy Small Block Engine - Bolt On A Cam And Heads And Add 120+HP - Car Craft Magazine
227 0.563 109° --> ~120HP --> 96rwHP

Nice HEAD Comparison article:
http://ls1tech.com/forums/dynamometer-results-comparisons/1453671-back-back-dyno-test-pi-215-s-ai-cnc-d-gm-5-3-a.html
Nice Close-Ups of AI Heads.

Guage POD: Auto Meter
AFR Meter: Auto Meter - Gauges

Truck in Shop: https://www.youtube.com/watch?v=8t3jNAdOW_4&feature=youtu.be @1.25 minute mark.
 

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Discussion Starter #11 (Edited)
I used the Comp cam under this one and was not impressed with the power
it made. these VVT cams were made for a L92 -6.2 eng.not a 5.3 eng.
comp cam lies on the use of this cam, I would look for a diff cam if i were u.

PS: I used all the same parts except the heads + SLP Pulley
and i have headers and custom exh

In to see the dyno sheet when tuned
 

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I used the Comp cam under this one and was not impressed with the power
it made. these VVT cams were made for a L92 -6.2 eng.not a 5.3 eng.
comp cam lies on the use of this cam, I would look for a diff cam if i were u.

PS: I used all the same parts except the heads + SLP Pulley
and i have headers and custom exh

In to see the dyno sheet when tuned
Which specific COMP CAM Part Number/Grind?
Are you saying this one--> http://www.summitracing.com/parts/CCA-156-400-13/
What were the before/after results that left you "not impressed"

Looks like this thread: http://www.355nation.net/forum/v8-engine-drivetrain/115441-tuned.html
This Grind: 210/224 .558/.560 114,
From 244 to 284 on initial tune,
2nd tune showed 303.33 hp/312.24 tq from this thread: http://www.355nation.net/forum/v8-engine-drivetrain/118353-re-tune-2.html

COMP Cams is suggesting +70hp at crank ... for the most aggressive grind in a 6.2L application
 

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Discussion Starter #14 (Edited)
That is my dyno sheet, the cam is 210/224 .556/.568 114 lobe C/L 105 cam C/L
pt # 156-400-13 for VVT eng. 1500-6600 rpm, this cam does not pull to max RPM
of course it makes more in a 6.2 it's bigger.pumps more air, =HP
 

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That is my dyno sheet, the cam is 210/224 .556/.568 114 lobe C/L 105 cam C/L
pt # 156-400-13 for VVT eng. 1500-6600 rpm, this cam does not pull to max RPM
of course it makes more in a 6.2 it's bigger.
Ok, so you realized ~59 rwhp from the mildest vvt cam on a 5.3l and COMP Cams is publishing ~70*0.8--> 56rwhp for the aggressive grind on a 6.2l, even if I am wrong and COMP Cams marketing is saying ~70rwhp.

Were there any other mods included in your before/after 2nd tune.....

~59rwhp from a CAM and supporting upgrades seems "real life" reasonable.
Some of these articles have read that are claiming over 100hp gains from a CAM/HEAD upgrade are likely "optimistic"

Not an expert, just based on reading/discussions.
 

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Discussion Starter #16
that tune was also for my header and exh change also with the cam
and all my mods. so that cam alone did not give me all that 59hp
 

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Discussion Starter #18
I was hopping for a stock idle, didn't get it, wanted stealthy. don't want a noisy truck,
or one that shakes and rocks.you can't be sneaky with that shit. again Comp lied to me.
said you would never know it had a cam in it if i had to go in for warranty work. i have
4 years that i will never get away with now. down the drain.
 

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Al has experienced the generic approach that Comp customer service is often guilty of. The huge split in duration of Comp's VVT offerings is aimed only at the L92 head engines. It is far from ideal for the little stepchild cathedral head 5.3. But Comp will tell you it's a great 5.3 cam because it is all they offer off the shelf.

Get something with about 6-8* more intake or 6-8* less exhaust for a better match to the 5.3. Or go +4/-4 and get something like a 218/224. Or just get with Pat G and have him spec you a cam.
The Guerra Group
He charges $40 I think, to spec a VVT cam. Uses Comp or EPS lobes.
I guarantee he will NOT spec a 214/228 cam for you, regardless what your goals are!
 

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Al has experienced the generic approach that Comp customer service is often guilty of. The huge split in duration of Comp's VVT offerings is aimed only at the L92 head engines. It is far from ideal for the little stepchild cathedral head 5.3. But Comp will tell you it's a great 5.3 cam because it is all they offer off the shelf.

Get something with about 6-8* more intake or 6-8* less exhaust for a better match to the 5.3. Or go +4/-4 and get something like a 218/224. Or just get with Pat G and have him spec you a cam.
The Guerra Group
He charges $40 I think, to spec a VVT cam. Uses Comp or EPS lobes.
I guarantee he will NOT spec a 214/228 cam for you, regardless what your goals are!
I hear ya, mass production is not always going to produce the optimal results.

Have you guys tried: CamQuest ? Select The Perfect Camshaft & Valve Train Components

In my case this is a MagnaCharger, full CNC head application, yet need to fly under CA Rules.

How much rwhp increase would you think is reasonable for a CAM Upgrade on a 5.3l motor?
 
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