80LS1T Posted November 12, 2003 Share Posted November 12, 2003 Well as many of you know I have the LT4 HOTCAM KIT in my 93' LT1 280ZX. Since I havent had it at the track yet I dont know what it will run in the 1/4 mile. I am hoping for low 12's with the Hotcam but I really want to get into teh 11's with out NOS. Since I cant remeber what the max lift on the springs are for the LT4 HOTCAM KIT is.......could I change my cam to the 306CC cam(Comp Cams "306" LT1 Camshaft, 230 / 244, .510 / .540 112 LSA, Very aggressive street/strip cam. Good top-end power. ) with out having coil bind?Or what about this cam....Comp Cams "Extreme" LT1 Camshaft, 230 / 236, .510 / .520 112 LSA, Very aggressive street/strip cam. I am going to wait to see what this set up runs. I think I'll wait anyways but if I have the intake off for any reason this winter I will probably just put the cam in....."while I'm at it!" Guy Quote Link to comment Share on other sites More sharing options...
Mike C Posted November 12, 2003 Share Posted November 12, 2003 The Lt4 Hot Cam is .525/.525 lift with the 1.6 rockers. What rocker ratio does Comp spec for their cam? The LT4 cam is plenty big enough. For much more LT1/LT4 info, try http://www.camaroz28.com or http://www.impalassforum.com I know the impala board has entire threads dedicated to the different cams. Quote Link to comment Share on other sites More sharing options...
Guest ls1z4me Posted November 12, 2003 Share Posted November 12, 2003 No the LT4 springs aren't suitable for that cam. Check with comp cams, they can set you up with a spring based on cam specs. The max lift for the LT4 Springs is .525, and is just marginal for the hot cam and 1.6 rockers. Quote Link to comment Share on other sites More sharing options...
mas28O Posted November 12, 2003 Share Posted November 12, 2003 I am using comp cams 305 Lift 510 510 dur 276 290 @.050 220 229 This cam is close to what you are using in power. I was going to use the cc306 cam but I did not want to hurt my 60' times with no low end. If I ever go 383 then I would use the cc306 but right I love the low end power of the cc305. Mike Quote Link to comment Share on other sites More sharing options...
80LS1T Posted November 12, 2003 Author Share Posted November 12, 2003 Since I dont know much about cams can someone explain the duration? Is that how long the valve is open of the 360* of the cam? I know I always hear about lift but most real car guys talk about duration and lift at .050" Also what is LSA and what does it mean? I've tried a search but all I keep coming up with is personal cam specs not really what the numbers mean in relation to power. So is the CC305 a "bigger cam" than the LT4 Hotcam? LT4 Hotcam Specs with 1.6 Ration Rocker Arms.... ----------------------Intake-----Exhaust----------------------------- Lobe Lift-------------0.328-------0.328__<--no clue what this is? Gross Valve Lift-----0.525------0.525 Lobe Centerline------109*-------115*__<--no clue what this is? Duration @.006"------272--------281___<--no clue what this is? Duration @.050"------219--------228___<--no clue what this is? Lobe Seperation-----------112________<--no clue what this is? Grumpy you out there?! Guy Quote Link to comment Share on other sites More sharing options...
JustAFantaZ Posted November 12, 2003 Share Posted November 12, 2003 LSA = Lobe Separation Angle I believe that the large the number, the less overlap of intake and exhaust valve opening and closing. The smaller the number, the choppier the idle. More duration = higher power band I think. Quote Link to comment Share on other sites More sharing options...
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