ok, putting my motor together and degree'd my cam...
its a comp xe274h..
http://www.compcams.com/Cam_Specs/Ca...x?csid=87&sb=2
lsa= 110
icl= 106
i installed my cam at 104* so 2* advanced since the motors for my dad and hes never going to be racing it anyways, thought hed like the low end torque
so how much is that going to change the power curve?
also, just reading some shyt online and somewhere i saw if the lsa is 110 and the icl is 106, than the cam already has 4* advance built in, so does it now have a total of 6* advance???
its a comp xe274h..
http://www.compcams.com/Cam_Specs/Ca...x?csid=87&sb=2
lsa= 110
icl= 106
i installed my cam at 104* so 2* advanced since the motors for my dad and hes never going to be racing it anyways, thought hed like the low end torque
so how much is that going to change the power curve?
also, just reading some shyt online and somewhere i saw if the lsa is 110 and the icl is 106, than the cam already has 4* advance built in, so does it now have a total of 6* advance???
I think Comp grinds a lot of their cams (I dont know about all of them), at least the xtreme energy series, 4 degrees advanced already. So yeah it's already built in.
On Probation
shoulda just used an XE268 for even more low end torque.
Junior Member
Don't confuse lobe seperation angle with intake centerline. The lobe seperation angle is the amount of degrees between the in. and ex. lobes where as the intake centerline is where you should install the cam. If it calls for a 106 center and you advance 2 degrees it is in at 104.
Quote:
yes this is what ive always been taught and have believed.. just wanted to make sure infernalvortex wasnt correct as wellOriginally Posted by DT1987RS
Don't confuse lobe seperation angle with intake centerline. The lobe seperation angle is the amount of degrees between the in. and ex. lobes where as the intake centerline is where you should install the cam. If it calls for a 106 center and you advance 2 degrees it is in at 104. 
What Infernal was probably pointing out is that most aftermarket cam grinders pin the nose so that with an aftermarket "stock replacement" timing set the ICL is advanced 4º from the stock ICL.
Chevy did that themselves until the late 1960s/early 1970s when most SBC cams got retarded 4º (usually by the timing set) by for a presumed emissions and low RPM torque gain to launch heavier and heavier vehicles.
I'm not sure if this applies to roller cammed factory engines or not, but it's easy to compare the pin locations, keyway positions, and stamped dot locations on a stock (removed) cam sprocket and a replacement sprocket. You should be able to see the 2º difference (4º crank rotation) easily with the naked eye. It's usually a good idea to compare them anyway to make sure the aftermarket replacement wasn't made at 4:55 on a Friday afternoon with 45º difference.
Chevy did that themselves until the late 1960s/early 1970s when most SBC cams got retarded 4º (usually by the timing set) by for a presumed emissions and low RPM torque gain to launch heavier and heavier vehicles.
I'm not sure if this applies to roller cammed factory engines or not, but it's easy to compare the pin locations, keyway positions, and stamped dot locations on a stock (removed) cam sprocket and a replacement sprocket. You should be able to see the 2º difference (4º crank rotation) easily with the naked eye. It's usually a good idea to compare them anyway to make sure the aftermarket replacement wasn't made at 4:55 on a Friday afternoon with 45º difference.
Quote:
Chevy did that themselves until the late 1960s/early 1970s when most SBC cams got retarded 4º (usually by the timing set) by for a presumed emissions and low RPM torque gain to launch heavier and heavier vehicles.
I'm not sure if this applies to roller cammed factory engines or not, but it's easy to compare the pin locations, keyway positions, and stamped dot locations on a stock (removed) cam sprocket and a replacement sprocket. You should be able to see the 2º difference (4º crank rotation) easily with the naked eye. It's usually a good idea to compare them anyway to make sure the aftermarket replacement wasn't made at 4:55 on a Friday afternoon with 45º difference.
lol very true... maybe this is why toyota does so good, they dont have that problem. damn chevy and their old way of thinkingOriginally Posted by Vader
What Infernal was probably pointing out is that most aftermarket cam grinders pin the nose so that with an aftermarket "stock replacement" timing set the ICL is advanced 4º from the stock ICL. Chevy did that themselves until the late 1960s/early 1970s when most SBC cams got retarded 4º (usually by the timing set) by for a presumed emissions and low RPM torque gain to launch heavier and heavier vehicles.
I'm not sure if this applies to roller cammed factory engines or not, but it's easy to compare the pin locations, keyway positions, and stamped dot locations on a stock (removed) cam sprocket and a replacement sprocket. You should be able to see the 2º difference (4º crank rotation) easily with the naked eye. It's usually a good idea to compare them anyway to make sure the aftermarket replacement wasn't made at 4:55 on a Friday afternoon with 45º difference.
i did degree the cam and set it for 104* i just wanted to make sure thats 2* advanced and not 6* because the cam already had 4* built in. question answered
