Too much cam for a 5.3?
02-17-2009, 08:01 PM
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Too much cam for a 5.3? How much really is too much for a pretty stock 5.3? Other mods would be intake and ehaust (lt's) only. Stock truck intake and tb, 799 heads, 918 springs and LS7 lifters. I want a good, lopey idle, but dont want to sacrifice all my bottom end. Trans is a TH350 (stall??)
Generally speaking, would this be good?....
Intake: 230.7 - .581
Exhaust: 223.4 - .564
LSA: 111.4
Thanks.
Generally speaking, would this be good?....
Intake: 230.7 - .581
Exhaust: 223.4 - .564
LSA: 111.4
Thanks.
02-17-2009, 08:26 PM
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the cam i have isnt far from this one (218/224 .550"/.550" 114) try something like that
http://www.youtube.com/watch?v=DnvkKxCXjVM
http://www.youtube.com/watch?v=DnvkKxCXjVM
02-17-2009, 10:28 PM
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Depends on what the 5.3 is in. In sand rail you would be ok. In an crewcab, you would need a decent size converter and/or gears. Also, the truck intakes kind of peak flow around 5800-6000 rpms. After that, they maintain the same flow.
All in all, what are your intentions and use?
All in all, what are your intentions and use?
02-18-2009, 12:09 AM
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Its going in a '72 Blazer 4wd. Weekend cruiser/offroad. Wont be hittin the rev limiter often or running down a timed track, so the 5800-6000 is good. Just looing for a good, all around power curve with a healthy idle.
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02-18-2009, 08:46 AM
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the cam i have isnt far from this one (218/224 .550"/.550" 114) try something like that
http://www.youtube.com/watch?v=DnvkKxCXjVM
http://www.youtube.com/watch?v=DnvkKxCXjVM
Last edited by sandking; 02-18-2009 at 08:53 AM.
02-18-2009, 09:00 AM
#10
the vinci cam from that video is grind number 056 under car cams and 045 under ls truck cams look it up on there website
over on ls1truck a guy picked up 70hp with this cam swap over the stock cam
http://www.ls1truck.com/forums/pics-...cam-5-3-a.html
Last edited by nastychevelle; 02-18-2009 at 09:15 AM.
02-18-2009, 11:16 AM
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In a 5.3 a 220/220 112 +4 cam works like the 224tr cam in the 5.7 ls1.
The reason you dont want to go too big is the compression ratio is less in the 5.3. If you bump it up you can run a bigger cam, otherwise you lose too much lowend torque
The reason you dont want to go too big is the compression ratio is less in the 5.3. If you bump it up you can run a bigger cam, otherwise you lose too much lowend torque
02-20-2009, 08:52 PM
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Tough call. I would choose a cam at 220/220 and under for a 4wd. I do not think you can go wrong with one of the Vinci truck cams. Hell, 90% are comp cams anyway.
02-20-2009, 09:33 PM
#16
In a heavy truck + that manifold you're are gonna want a cam that makes torque. TC or not also makes a diff. Tow? Offroad it? IMHO all the cams mentioned above are too big for a truck that is NORMALLY used like a truck. Look at the biggest tq. cams not HP cams... That will make you the happiest
As a rule of thumb subtract about 5* duration and a cam for a 5.3 will behave ABOUT like it would in a 5.7.
As a rule of thumb subtract about 5* duration and a cam for a 5.3 will behave ABOUT like it would in a 5.7.
02-21-2009, 10:13 AM
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I think I will be looking for a 224ish Vinci cam. I want some top end too, but with a decent torque curve also. I am still searching and learning before I make my decision. Thanks for the info.
03-09-2009, 08:21 PM
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I emailed Comp for there opinion. I thought it was on the small side. Any opinions from you guys? Here is what they had to say:
"I would go with our XFI 54-451-11 cam. I have listed the specs for this cam
below.
INTAKE MASTER 3707R
EXHAUST MASTER 3709R
ENGINE GM G3 XFI 261 HR15
GRIND NUMBER GM G3 XFI 261 HR15
INT EXH
HYDRAULIC Y/N YES DUR @.050
208 212
INT EXH
LOBE LIFT .326 .328
VALVE ADJUSTMENT HYD HYD ROCKER RATIO 1.70 1.70
MAX GROSS VALVE LIFT .554 .558
DUR @ .006 TAPPET LIFT 261 265 LOBE SEPARATI 115.0
ADVANCE 4
VALVE TIMING OPEN CLOSE VALVE SPRINGS 26915-16
.050 INT 7- 35
EXH 45 13-
THESE SPECS ARE FOR CAM(S) INSTALLED
111.0 INTAKE CENTERLINE "
"I would go with our XFI 54-451-11 cam. I have listed the specs for this cam
below.
INTAKE MASTER 3707R
EXHAUST MASTER 3709R
ENGINE GM G3 XFI 261 HR15
GRIND NUMBER GM G3 XFI 261 HR15
INT EXH
HYDRAULIC Y/N YES DUR @.050
208 212
INT EXH
LOBE LIFT .326 .328
VALVE ADJUSTMENT HYD HYD ROCKER RATIO 1.70 1.70
MAX GROSS VALVE LIFT .554 .558
DUR @ .006 TAPPET LIFT 261 265 LOBE SEPARATI 115.0
ADVANCE 4
VALVE TIMING OPEN CLOSE VALVE SPRINGS 26915-16
.050 INT 7- 35
EXH 45 13-
THESE SPECS ARE FOR CAM(S) INSTALLED
111.0 INTAKE CENTERLINE "