.631/.644" cam - PTV issues?
03-07-2008, 12:35 PM
#1
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.631/.644" cam - PTV issues? I am purchasing a cam for my LS2 motor with 4cc valve relief pistons. .631/.644 lift. Stock stroke.
I am definately going to check my PTV clearance, but anybody out there forsee any issues?
I am definately going to check my PTV clearance, but anybody out there forsee any issues?
03-07-2008, 12:46 PM
#5
Your valve are a maximum lift when the piston is all the way down the cylinder bore. It's during the overlap cycle when you run into piston to valve clearance. Duration is what gets you, not lift. We'll need to know a lot more about your setup. What size heads, what size valves you're running, what size combustion chambers, how much the heads have been milled, and how thick of a head gasket. Give us those details and the duration, LSA and installed intake centerline and you'll get a more more educated answer.
Hey nobody said it was going to be an easy answer.
Hey nobody said it was going to be an easy answer.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
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03-07-2008, 09:03 PM
#11
You'll be fine. I ran a similar speced cam in a stock LS2 but with 2 degrees tigher LSA and I want to say I had something like .084 on the intake and .116 on the exhaust.
03-08-2008, 09:14 AM
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Lingenfelter claims that they work well with this application....I should be fine spring-wise, I just wanted to check to ensure I wouldn't have any PTV issues.
03-08-2008, 12:49 PM
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I've seen a graph where someone swapped this cam for some godzilla cam spec'd by one of the people known for custom cams around the forums, which only lead to +5 peak hp and -10hp below peak in an LS2.
