Cam Narrowed down
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From: Jxn,Mississippi
Cam Narrowed down its been well decided that my blown up 5.7 will be replaced with a 5.3 from a 2004 avalanche(picked the motor up yesterday) i've been back and forward 100x's debating on what to do as far as the cam is concerned, and i've finally narrowed it down. i'm looking for something QUIET and sneaky w/ a good response to nitrous but runs strong on motor as well. Car is/will be FREQUENTLY raced and driven almost daily.
mods so far:
LS6 intake
ported LS6 throttle body
lid
LT headers
2.5" Y-pipe
Flowmaster 1 chamber
3000 stall
4.10 gears
175hp nitrous
heads will be ported/polished
now for the cam selection, i've narrowed it down to the following 6:
Thunder Racing CheaTr v3 219/230 .607/.604 117
EPS Truck Torque 2 218/226 .595/.598 113
EPS LS 214/232 .605/.598 117
Comp 269Lr 219/227 .607/.614 112
Comp 273Lr 223/231 .610/.617 112
Comp XER273 224/230 .581/.588 114
I'm looking to make this 5.3 a sleeping street beast. Let's here some opinions/facts. i know someone is going to say go with a much bigger cam.......if it lopes like crazy......i'm not interested
mods so far:
LS6 intake
ported LS6 throttle body
lid
LT headers
2.5" Y-pipe
Flowmaster 1 chamber
3000 stall
4.10 gears
175hp nitrous
heads will be ported/polished
now for the cam selection, i've narrowed it down to the following 6:
Thunder Racing CheaTr v3 219/230 .607/.604 117
EPS Truck Torque 2 218/226 .595/.598 113
EPS LS 214/232 .605/.598 117
Comp 269Lr 219/227 .607/.614 112
Comp 273Lr 223/231 .610/.617 112
Comp XER273 224/230 .581/.588 114
I'm looking to make this 5.3 a sleeping street beast. Let's here some opinions/facts. i know someone is going to say go with a much bigger cam.......if it lopes like crazy......i'm not interested
219(.607")/226(.605") 115lsa. LSL intake lobes and LXL exhaust lobes for a quieter valvetrain. The cam will have -7.5* overlap with the 115lsa, so it should be somewhat stealthy.
BTW, a FM single chamber muffler doesn't quite fit into the category of "QUIET and sneaky".
BTW, a FM single chamber muffler doesn't quite fit into the category of "QUIET and sneaky".
Thread Starter
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Joined: Jul 2006
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From: Jxn,Mississippi
219(.607")/226(.605") 115lsa. LSL intake lobes and LXL exhaust lobes for a quieter valvetrain. The cam will have -7.5* overlap with the 115lsa, so it should be somewhat stealthy.
BTW, a FM single chamber muffler doesn't quite fit into the category of "QUIET and sneaky".
BTW, a FM single chamber muffler doesn't quite fit into the category of "QUIET and sneaky".
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Verdad Gallardo Check Out the Walker DynoMax Super Turbos. They are the quietest fast muffler that I know of and have been for years.
Thread Starter
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Joined: Jul 2006
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From: Jxn,Mississippi
Originally Posted by 99Bluz28
Cat-back, or off the y-pipe muffler?
Also, are you wanting a quiet valvetrain or does it matter?
Also, are you wanting a quiet valvetrain or does it matter?
Originally Posted by speedtigger
Check Out the Walker DynoMax Super Turbos. They are the quietest fast muffler that I know of and have been for years.
http://www.streetfire.net/video/65-s...le_2301955.htm
Run the 223,.610",LSL, int., but run a 230,.609",LXL, exh. instead of the 231,.617", LSL, and you'll have a quieter valvetrain because of the softer closing rate of the LXL lobes.
Thread Starter
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From: Jxn,Mississippi
i was looking for the lobes today in the master lobe catalog but it didn't see the LSL/LXL lobes at all
All those cams are too big, too lazy down low, or too rowdy (lots of overlap and noise) for a 5.3.
Remember, a 5.3 is going to want a cam that's about 4 degrees smaller in overlap than a 5.7L to behave the same. To be quiet, you're going to want to limit your overlap to -10 or a max of - 8 degrees of overlap at .050". But since your 5.3L only has 9.6:1 static compression, your torque down low is going to be pretty poor with any intake valve closing point later than 39 or 40 degrees ABDC @ .050".
I'd do something more like a 218/222 .595/.602" 114LSA +4 or 115LSA +4 cam with EPS lobes on intake and quiet LXL lobes on the exhaust.
Remember, a 5.3 is going to want a cam that's about 4 degrees smaller in overlap than a 5.7L to behave the same. To be quiet, you're going to want to limit your overlap to -10 or a max of - 8 degrees of overlap at .050". But since your 5.3L only has 9.6:1 static compression, your torque down low is going to be pretty poor with any intake valve closing point later than 39 or 40 degrees ABDC @ .050".
I'd do something more like a 218/222 .595/.602" 114LSA +4 or 115LSA +4 cam with EPS lobes on intake and quiet LXL lobes on the exhaust.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
TECH Regular
Joined: Jul 2006
Posts: 420
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From: Jxn,Mississippi
All those cams are too big, too lazy down low, or too rowdy (lots of overlap and noise) for a 5.3.
Remember, a 5.3 is going to want a cam that's about 4 degrees smaller in overlap than a 5.7L to behave the same. To be quiet, you're going to want to limit your overlap to -10 or a max of - 8 degrees of overlap at .050". But since your 5.3L only has 9.6:1 static compression, your torque down low is going to be pretty poor with any intake valve closing point later than 39 or 40 degrees ABDC @ .050".
I'd do something more like a 218/222 .595/.602" 114LSA +4 or 115LSA +4 cam with EPS lobes on intake and quiet LXL lobes on the exhaust.
Remember, a 5.3 is going to want a cam that's about 4 degrees smaller in overlap than a 5.7L to behave the same. To be quiet, you're going to want to limit your overlap to -10 or a max of - 8 degrees of overlap at .050". But since your 5.3L only has 9.6:1 static compression, your torque down low is going to be pretty poor with any intake valve closing point later than 39 or 40 degrees ABDC @ .050".
I'd do something more like a 218/222 .595/.602" 114LSA +4 or 115LSA +4 cam with EPS lobes on intake and quiet LXL lobes on the exhaust.
Thread Starter
TECH Regular
Joined: Jul 2006
Posts: 420
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From: Jxn,Mississippi
Mine has duals, but this is what it sounds like:
http://www.streetfire.net/video/65-s...le_2301955.htm
http://www.streetfire.net/video/65-s...le_2301955.htm
