4* advance, 2* advance, or straight-up?
08-27-2004, 11:57 PM
#1
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4* advance, 2* advance, or straight-up? I've decided on a 208/214, 554/559, 115 cam for my beast. The only thing left to do before I order is decide if I want any advance ground in.
Some relevant specifics of my application:
- 6000 lb truck
- 5.3L (not 5.7L or 6.0L)
- Magnuson Radix @ 6 psi
- 4L65E & stock converter
- stock 3.73 G80 rear end
The truck is my daily driver - I drive like an old man 95% of the time, but the other 5% of the time when I get on it, I want the power to be there.
One cam grinder told me to do +4*...he said all truck cams should be 4* advanced. Another cam guy said the same thing. It wasn't until I talked with a couple of guys here, that some people started saying to install it straight up.
So I am here for advice on the advance issue. The only thing I ask is that if you tell me what you think I should do, please tell me why, so I can understand your reasoning.
Some relevant specifics of my application:
- 6000 lb truck
- 5.3L (not 5.7L or 6.0L)
- Magnuson Radix @ 6 psi
- 4L65E & stock converter
- stock 3.73 G80 rear end
The truck is my daily driver - I drive like an old man 95% of the time, but the other 5% of the time when I get on it, I want the power to be there.
One cam grinder told me to do +4*...he said all truck cams should be 4* advanced. Another cam guy said the same thing. It wasn't until I talked with a couple of guys here, that some people started saying to install it straight up.
So I am here for advice on the advance issue. The only thing I ask is that if you tell me what you think I should do, please tell me why, so I can understand your reasoning.
Last edited by Naked AV; 08-28-2004 at 12:29 AM.
08-28-2004, 12:00 AM
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Not too big of a cam, plus the blower should net very good low end power straight up. You can try +2,+4 and see what happens, but straight up will work well.
08-29-2004, 03:25 PM
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That cam is pretty small so i'd stick with straight up at 115ICL. Advancing a small cam will make it die off too much up top. Shoot the LS6 cam thats 207/217 117LSA is retarded 2* stock. I doubt that you'd ever notice the difference between 0 or +4 anyway. To say "all truck cams should be +4" is just not a good statement. Running it straight up vs. +4 will delay the exhaust valve closing event, which is a good thing when running a SC with a restrictive exhaust(no headers). This is just my opinion, and you know what opinions are like..LOL. You could just go for the middle and do +2.
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08-30-2004, 12:58 PM
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i would either do 0 or 2, 2 will give you more low end power, most cams are ground 2 deg advanced, with the blower i would say go 2 deg since youll want the low end torq, specially on a truck that heavy
08-31-2004, 09:32 AM
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Aren't there specific valve timing events one should shoot for on just about any engine? Especially on the intake side?
I can't put in a worthy vote for the degreeing, but I believe the huge cam thread in this section hits upon the subject. I'd get it ground so the valve timing closely matches the ideal specs.
I can't put in a worthy vote for the degreeing, but I believe the huge cam thread in this section hits upon the subject. I'd get it ground so the valve timing closely matches the ideal specs.
08-31-2004, 10:50 AM
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Originally Posted by marc_w
Aren't there specific valve timing events one should shoot for on just about any engine? Especially on the intake side?
I can't put in a worthy vote for the degreeing, but I believe the huge cam thread in this section hits upon the subject. I'd get it ground so the valve timing closely matches the ideal specs.
I can't put in a worthy vote for the degreeing, but I believe the huge cam thread in this section hits upon the subject. I'd get it ground so the valve timing closely matches the ideal specs.
Marc-are you really pulling out the TR220 for one of those Vinci jobs?
08-31-2004, 11:39 AM
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Okay, I started to get more into that thread, and I getcha... It's real interesting stuff.
Yeah, I'm going to try the 210/218 here. I don't think my motor (with lack of mods) is ready for the 220-112. Not to get way off subject, but I towed with it last week and it's not making (noticeably) more power where I'd like it to be.
Yeah, I'm going to try the 210/218 here. I don't think my motor (with lack of mods) is ready for the 220-112. Not to get way off subject, but I towed with it last week and it's not making (noticeably) more power where I'd like it to be.
08-31-2004, 11:47 AM
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Originally Posted by marc_w
Yeah, I'm going to try the 210/218 here. I don't think my motor (with lack of mods) is ready for the 220-112. Not to get way off subject, but I towed with it last week and it's not making (noticeably) more power where I'd like it to be.
D-Max, turbo, or stroker. 
