LQ9 cam in a 5.3 lm7
04-18-2015, 11:31 AM
#1
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LQ9 cam in a 5.3 lm7 Got an 05 sierra with the gen III 5.3 and 248,000 miles
Lifters have been nothing but non stop noise since I bought it a few months back and I'm finally getting around to taking of the heads and replacing them this week, along with the cam and pushrods since I'll already have it apart.
I'm going to imagine the cam is chewed up and I just want to swap it out for added insurance while I'm doing the lifters.
Question.
Came across a buddy selling a lq9 cam from an 03 escalade engine he got. It's in good shape and it's $25.
Cam specs for the lq9 are
Camshaft duration (@.050 in):
196 / 201, .467 / .479 116 LSA
Cam for my 5.3 is
190/191, .466/.457 lift, 114 LSA
What can I expect power wise and low end power wise in my truck and will it need tuned after the swap?
Lifters have been nothing but non stop noise since I bought it a few months back and I'm finally getting around to taking of the heads and replacing them this week, along with the cam and pushrods since I'll already have it apart.
I'm going to imagine the cam is chewed up and I just want to swap it out for added insurance while I'm doing the lifters.
Question.
Came across a buddy selling a lq9 cam from an 03 escalade engine he got. It's in good shape and it's $25.
Cam specs for the lq9 are
Camshaft duration (@.050 in):
196 / 201, .467 / .479 116 LSA
Cam for my 5.3 is
190/191, .466/.457 lift, 114 LSA
What can I expect power wise and low end power wise in my truck and will it need tuned after the swap?
04-18-2015, 02:58 PM
#2
TECH Veteran
LQ9 vs. LM7
Though it did not offer the top-end charge of the LS2-LS6 grinds, the (late) LQ9 cam offered impressive power gains over the LM7 and would be a good upgrade for a 5.3L truck owner or someone looking to improve performance without sacrificing low-speed torque production. The slight loss of 8 lb-ft was more than offset by the 40 extra horsepower at the top. It's important to note that the power gains offered here would likely be magnified had we tested the cams on a larger 6.0L.
Read more:dumhttp://www.hotrod.com/how-to/engine/1307-ls-cam-test-comparison/#ixzz3Xh0YzHqsdum
Follow us:dum@HotRodMagazine on Twitterdum|dumHotRodMag on Facebook
Though it did not offer the top-end charge of the LS2-LS6 grinds, the (late) LQ9 cam offered impressive power gains over the LM7 and would be a good upgrade for a 5.3L truck owner or someone looking to improve performance without sacrificing low-speed torque production. The slight loss of 8 lb-ft was more than offset by the 40 extra horsepower at the top. It's important to note that the power gains offered here would likely be magnified had we tested the cams on a larger 6.0L.
Read more:dumhttp://www.hotrod.com/how-to/engine/1307-ls-cam-test-comparison/#ixzz3Xh0YzHqsdum
Follow us:dum@HotRodMagazine on Twitterdum|dumHotRodMag on Facebook