918 springs ok with a .581 / .585 cam?
01-31-2008, 07:08 PM
#2
I ran a 224/224-581 lift for 3 years with 26918 springs,200-250 runs and 15000 miles.When i pulled the heads off to go with the PRC 5.3 heads ,i checked all the springs and they were only down on pressure 10-15 lbs tops, which i would of expected, and seat pressure was only down 3-5 lbs.Not bad at all IMOP.I thought they would of been down a lot more,like 40-50 lb.
01-31-2008, 08:28 PM
#5
TECH Addict
The 918s are made for cams like that. Double springs add a measure of insurance but also add extra pressure which you don't need unless you are running max RPM alot and add to wear and tear on lifters and cam.
Use the 918s according to the guidelines and you'll be fine.
Use the 918s according to the guidelines and you'll be fine.
02-01-2008, 09:00 AM
#6
The Comp XE-R lobes are too aggressive for 918 springs. This comes straight from Comp Cams. This of course, was true with past 918s. If the newer, improved 918s can do it, then Comp should update their info.
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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.
