5.3 oil pressure drop after cam swap
#13
I put the lq9 cam in because it was basically free and only took a few hours to install, I know there is not much to gain, I figured with forced induction it would help in the higher end of the rpm band since that is where these cams make there power, I was very careful removing and installing cam I used no force to remove cam at all, slid out very slowly and carefully and reinstalled the same way. Also the supercharger has only been on the last few weeks of which I maybe put 300 miles on it. I'm planning on running 10w30 synthetic when i change it. I will keep this post updated as for oil pressure once i change oil this week.
#14
Custm2500's Rude Friend
iTrader: (17)
FWIW stock cam specs
https://www.performancetrucks.net/fo.../?ref=esp-link
5.3 LM7
190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
6.0 LQ9
207/196 int/exh @ 0.05" duration
0.479" / 0.467" int/exh lift
116 LSA
https://www.performancetrucks.net/fo.../?ref=esp-link
5.3 LM7
190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
6.0 LQ9
207/196 int/exh @ 0.05" duration
0.479" / 0.467" int/exh lift
116 LSA
#15
Custm2500's Rude Friend
iTrader: (17)
I put the lq9 cam in because it was basically free and only took a few hours to install, I know there is not much to gain, I figured with forced induction it would help in the higher end of the rpm band since that is where these cams make there power, I was very careful removing and installing cam I used no force to remove cam at all, slid out very slowly and carefully and reinstalled the same way. Also the supercharger has only been on the last few weeks of which I maybe put 300 miles on it. I'm planning on running 10w30 synthetic when i change it. I will keep this post updated as for oil pressure once i change oil this week.
Curious to see if the oil change to 10-30 helps
#16
Yes oil pressure drop occured after cam swap before charger. I replaced the cam retainer plate after first noticing it. then figured its not dropping any lower then 20-25 at hot idle, pulls about 30-35 going down highway. if i rev it up in neutral it will hit 60lb by about 4krpm. So I will try the oil change and see if it does it. Its also been quite a bit warmer out since we did the cam. it was around 50-60 then its now in the 80's pretty regularely.
#17
13 Second Truck Club
iTrader: (1)
FWIW stock cam specs
https://www.performancetrucks.net/fo.../?ref=esp-link
5.3 LM7
190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
6.0 LQ9
207/196 int/exh @ 0.05" duration
0.479" / 0.467" int/exh lift
116 LSA
https://www.performancetrucks.net/fo.../?ref=esp-link
5.3 LM7
190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
6.0 LQ9
207/196 int/exh @ 0.05" duration
0.479" / 0.467" int/exh lift
116 LSA
99 12560966 191/190 .457/.466 115.5
00-04 12560967 191/190 .457/.466 114
the 03-04 LM7 used the 12560967 camshaft
LQ4
99-00 12560967 191/190 .457/.466 114
01-04 LQ4 cam is same as Camaro, Corvette LS and LQ9 cam
LQ9 02-03 12561721 196/207 .467/.470 116
You've got the intake and exhaust mixed up on the LQ9 cam.
BTW, 17 degrees of increased exhaust duration seems a bit significant to me, I know an LQ4 cam swap into a 99 is a significant gain in performance, especially low end TQ, I've done it
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