learned something about cam timing
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Joined: Nov 2001
Posts: 1,151
From: orlando,florida,usa
learned something about cam timing
was looking at the cam i'm going to use. well they have it listed for the LT1 and for the earlier engines. same specs. or so i thought. both are
220/230 @ .050
.510/.510 lift
but i looked closer at the actual cam cards for these 2 ALMOST identical cams. the point at which the valves open and close are different. so, i plugged them into DD2000 and got this difference.
hp compare
http://www.stealthram.com/images/l98lt1hpcompare.gif
tq compare
http://www.stealthram.com/images/l98lt1tqcompare.gif
here are the open and close points for each cam. this is in crank degrees. the L98 style has more below 4500. the LT1 has more above 4500.
07-305-8 L98 cam profile
IO 28 IC 68
EO 83 EC 27
08-305-8 LT1 cam profile
IO 0 IC 40
EO 53 EC -3
220/230 @ .050
.510/.510 lift
but i looked closer at the actual cam cards for these 2 ALMOST identical cams. the point at which the valves open and close are different. so, i plugged them into DD2000 and got this difference.
hp compare
http://www.stealthram.com/images/l98lt1hpcompare.gif
tq compare
http://www.stealthram.com/images/l98lt1tqcompare.gif
here are the open and close points for each cam. this is in crank degrees. the L98 style has more below 4500. the LT1 has more above 4500.
07-305-8 L98 cam profile
IO 28 IC 68
EO 83 EC 27
08-305-8 LT1 cam profile
IO 0 IC 40
EO 53 EC -3
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