so you want a vvt cam swap?!?!
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so you want a vvt cam swap?!?!
after doing a lot more digging than the average bear would do about this for two weeks, i have come to a conclusion. GM is very annoying.
Comp Cams tech bulletin.
GM introduced a second style VVT cam actuator (aka phaser) in 2007 and ran two different cam
actuators through 2007‐2008+. The new style became the exclusive unit in most 2009+ engines.
•Original (old style) GM Part #12585994: 2007‐2008 (uses cam core 156‐)
•Current (new style) GM Part #12606358: 2007‐2009+ (uses cam core 189‐). The difference in
camshaft core is the pin to centerline position.
The difference in the pin between 156 and 189 equates to 13 degrees cam retard (if a 156 is used
where a 189 is required).
upon more research, it all makes sense now, and how this bulletin comes into play. some may think "duh" and others will look at it and say, "well it makes sense now"
this is how it affects you and your part numbers.
on the front side of your cam actuator {phaser} there is a three digit number. 994, or 358. compare this to the numbers above and you will see where it comes into play it.
99% of the people will order a 156-40x-13 cam. then some will complain about a loss of low end torque and the sudden rush of top end. bells ringing yet? if they ordered a 189-40x-13 the torque would have cam up and the same about of top end would have been had with great midrange.
now there is a slight problem with ordering a 189 cam core. 9/10th of the time most vendors won't stock it because most go off the websites, and the 156 number comes up.
one vendor actually asks what year the engine is, and gets you the right phaser limiter and matching cam. TSP.
so when you want to order a vvt cam, make sure you are getting the right cam core, and phaser.
How to install the comp cams phaser limiter block courtesy of Sand Man
http://www.youtube.com/watch?v=Tsj4anpULX0
Comp Cams tech bulletin.
GM introduced a second style VVT cam actuator (aka phaser) in 2007 and ran two different cam
actuators through 2007‐2008+. The new style became the exclusive unit in most 2009+ engines.
•Original (old style) GM Part #12585994: 2007‐2008 (uses cam core 156‐)
•Current (new style) GM Part #12606358: 2007‐2009+ (uses cam core 189‐). The difference in
camshaft core is the pin to centerline position.
The difference in the pin between 156 and 189 equates to 13 degrees cam retard (if a 156 is used
where a 189 is required).
upon more research, it all makes sense now, and how this bulletin comes into play. some may think "duh" and others will look at it and say, "well it makes sense now"
this is how it affects you and your part numbers.
on the front side of your cam actuator {phaser} there is a three digit number. 994, or 358. compare this to the numbers above and you will see where it comes into play it.
99% of the people will order a 156-40x-13 cam. then some will complain about a loss of low end torque and the sudden rush of top end. bells ringing yet? if they ordered a 189-40x-13 the torque would have cam up and the same about of top end would have been had with great midrange.
now there is a slight problem with ordering a 189 cam core. 9/10th of the time most vendors won't stock it because most go off the websites, and the 156 number comes up.
one vendor actually asks what year the engine is, and gets you the right phaser limiter and matching cam. TSP.
so when you want to order a vvt cam, make sure you are getting the right cam core, and phaser.
How to install the comp cams phaser limiter block courtesy of Sand Man
http://www.youtube.com/watch?v=Tsj4anpULX0
Last edited by Area47; 12-11-2012 at 05:00 PM.
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I laughed when I read this because I was just reading about a vvt swap in an s10 and was complaining about how he had no low end and then picked up at the top. Everyone there was stumped, I'll have to post this link. I'm going to go out on a limb and say this info should be a sticky.
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I laughed when I read this because I was just reading about a vvt swap in an s10 and was complaining about how he had no low end and then picked up at the top. Everyone there was stumped, I'll have to post this link. I'm going to go out on a limb and say this info should be a sticky.
YaY sticky!
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Another good thread from a couple weeks ago about the cam cores
To vvt or not to vvt - LS1TECH
To vvt or not to vvt - LS1TECH