Cam swap questions!
05-01-2015, 12:13 PM
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From an older thread:
What year 5.3 and what vehicle is it in? The LS7 cam does not have a provision for the cam sensor so if it is used in a gen 3 block retaining fuel injection it will require a front mounted cam sensor with the appropriate timing sprocket. This would require that you get a new front cover, the cam sensor, the matching cam sprocket, and a cam sensor extension harness. So you need to add the cost of these parts to whatever you pay for the cam.
All this to get a 211/230 .560/.557 120+4(w/ 1.7 rockers) camshaft that has too much split and too wide an LSA for a 5.3 liter engine. You would be much better off going with an aftermarket cam that better suits your motor.
Edit: Just wanted to add that if you were planning on going carb that this camshaft profile is even worse for that application.
All this to get a 211/230 .560/.557 120+4(w/ 1.7 rockers) camshaft that has too much split and too wide an LSA for a 5.3 liter engine. You would be much better off going with an aftermarket cam that better suits your motor.
Edit: Just wanted to add that if you were planning on going carb that this camshaft profile is even worse for that application.
05-01-2015, 12:18 PM
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2009 5.3L-best cam for torque in a truck? I am preparing this new crate engine to swap into my 2004 Silverado w/ a 4.8L. I will delete the AFM function and lifters before the swap. Can someone recommend the best GM cam for low end torque? I read the hotrod test:
http://www.hotrod.com/how-to/engine/..._plusone_share.
and have concluded that these are the best cams for low end torque:
1. gm part #12561721 196/207, max lift 0.479/0.467, LSA 116 2. gm part #12560967 191/190, max lift 0.466/0.457, LSA 114
The #2 above is the cam in my 2004 4.8L, I think it will give the most torque. but maybe #1 is best.
My old engine: 2004 LR4 4.8L, w/head casting 12561706 and 1.98" inlet valves My new engine: 2009 LY5 5.3L, w/head casting 799 and 2.00" inlet valves
my new 5.3L LY5 AFM cam is part #12563207(also part #12625436), I have removed it from the 2009 5.3L LY5 and have measured max lift @ 0.480/0.480. Can I use this cam if I remove the AFM function? The other specs are nut published by GM. Maybe this is the best cam for low end torque.
Any advice would be appreciated. GM has sent me the detailed drawing for this cam but I cannot interpret the duration from the drawing. The drawing is attached.
Thanks, Charlie
http://www.hotrod.com/how-to/engine/..._plusone_share.
and have concluded that these are the best cams for low end torque:
1. gm part #12561721 196/207, max lift 0.479/0.467, LSA 116 2. gm part #12560967 191/190, max lift 0.466/0.457, LSA 114
The #2 above is the cam in my 2004 4.8L, I think it will give the most torque. but maybe #1 is best.
My old engine: 2004 LR4 4.8L, w/head casting 12561706 and 1.98" inlet valves My new engine: 2009 LY5 5.3L, w/head casting 799 and 2.00" inlet valves
my new 5.3L LY5 AFM cam is part #12563207(also part #12625436), I have removed it from the 2009 5.3L LY5 and have measured max lift @ 0.480/0.480. Can I use this cam if I remove the AFM function? The other specs are nut published by GM. Maybe this is the best cam for low end torque.
Any advice would be appreciated. GM has sent me the detailed drawing for this cam but I cannot interpret the duration from the drawing. The drawing is attached.
Thanks, Charlie
