I picked up a recently freshened up, forged, flat-top 408 that I'm going to put in my 2005 crew cab Sierra Denali and I'm looking for a cam recommedation. It is a daily driver with twin garrett gt3071r's (Rick @ Synergy's old shop truck system) and a stock stall (I have tried a TBTQ as it stalled to about 3k and I/wife hated it). With the 317's and flat-top pistons, I expect around 10.0:1 compression (which should help keep my freeway mileage from sucking too much worse than it already does). With my current fuel system (255lph in-tank, 60lb injectors and a Snow Meth kit) I'm probably limited to about 15lbs before I run out of fuel. I know I may be asking for too much but I'm looking for a moderate cam that won't kill my HP potential while still giving me the low end torque that makes my truck so easy to drive (wife and 2 little kids!).

I'm sure my current stock LQ9 cam (196/207 .479/.467 116) is obviously too small for the 408 (and definetely holding me back with my 6.0l) but I don't want something that is going to kill my low end torque (5600+lb truck). A short list of what I'm been considering:

2002 Z06 cam 204/218 .555/.551 117.5
Comp XR265HR-15 212/218 .551/.550 115
Crane HR-210 210/218 .531/.531 114
GT2-3 207/220 .571/.578 118.5

Any sugggestions? Are these guys too small for a 408? I know with a turbo, the cam is not as critical as in a NA system so I have a lot of lattitude with my choice but I don't want to choke off my 408. I have read a lot about single pattern cams and turbos so you don't bleed off boost but I can't find many guys running one in heavy trucks. I also know people generally pick too big a cam and the driveablility suffers so I want to keep that in mind. Also, I see a 4L80e in my not-too-distant future so I need to consider the gearing change when that happens. Since the current 4.11's are probably a little too short for a turbo, the 4L80e might actually work better than the current beefed up 4L65e so it may be a blessing.

Thanks, Rick

 

I have a cam that I have been told is good for FI, its a little bigger then the Z06 cam. The link is in my sig.

 

Too small

I like those two choices

might go a touch bigger and I'd throw in 4 deg advance..

 

I've been eyeing your cam since you posted it. It has definite potential for my application but the lift is a little less than I'd like (I know you have heard that before). The stock 317's intake flow max out out .550" so I'd like to find something close to that. I'll keep it in mind.

Thanks, Rick

 

I have a forged 408 that will have less compression that I would trade with you if interested. It has 0 miles, I built it for my Camaro and have been toying with the idea of building it NA. I don't know if you would be interested or not but I thought I would offer it. That way you would run alot more boost safer than at 10-1. It has a cam in it but I am afraid that it would be too much for your truck because it was specd with a M6 stripper SS in mind, PM me if you might be interested. It is a 236/236 .617 lift and 114 LSA from what I have seen turbos (in cars mind you) seem to LOVE single pattern or reverse split

 

vinci performance Crane cam is what I run:
here are the specs

216 224 .551 .551 lsa 115

 

Maybe you should ask the guy who built the kit what he thinks?

 

LMAO...

Why would he want to get the right cam the first time?

Rick, What DO you think???

 

LOL! I was trying to be prudent and see what others were running before I crawled to the Synergy alter and ask the phophet for his divine answer!

Well Rick, since you stepped up, my question for you was a two parter:

1)Do I stick with the flattops and limit the boost to 14-15lbs (if that is do-able on CA 91 octane and a lot of Meth) or do I swap out the flattops for some dish pistons and kick it up to 17-18lbs. I am leaning on keeping the flattops (obviously they are aleady installed and ready to go) to help with mileage and everyday driveabiblity but is that going to put a limit on the overall potential of the system.

2) That said, a cam recomendation that will take advantage of the extra displacement and increase my bottem end torque whilr not choking off the top end charge.

Rick

 

So many different facts are needed. The first being I know he cares about gas Mileage alot! Everytime I tune his truck, he wants me to make sure the economy is good and not poor. Which I understand because I hate getting low miles on my truck too. The next thing we all need is the compression. What is it? This will determine too many factors in his cam choice. The next is operating window of power. Where is it? Where do you want it? Why a 408 and not a 370? All these things. So until I hear all these, I cant say much.

Hows that for how things work?