I installed a Vinci #080 cam in Oct and after I got done tuning w/HPTuners, my 2002 5.3l Tahoe pulled 280RWHP and 287RWTQ Dynojet SAE (auto trans 2nd gear locked). I had WCCH do mild Stage1 work on the stock heads at the end of December (bowl area cleanup,1.95"/1.57" intake/exhaust valves, milled .025" for a 57.2cc combustion chamber). I just re-dyno'd at the same shop, and after adding more fuel across the board (stock injectors are now at 92% duty cycle), I made 298RWHP and 301RWTQ SAE. Below is the Cam only, and Cam/Heads results:


The only other change was Gibson shorty smog legal headers (I still have stock cats/ypipe)....I think most if not all of the power came from the heads not the shorty's. I already had a UPD intake tube/lid with a high flow panel filter, but i'm going to install an Outlaw system next week. My Tahoe has great power just off idle compared to stock and is a blast to drive. Anyway, all I need now is to find out how this "Vette Servo" thing is installed that you all talk about...OK, I got the instructions

 

Congrats! i like it when the gains are all across the board, very nice

 

nice gains, but why didn't you change the intake valve size? I thought the stock intake valve size was 1.95 or am i wrong? like i said good numbers for a 2nd gear pull.

 

from what I understand, a stage 1(so to speak) is more about throttle response and crisp drivability........

 

Stock intake valves are 1.89. Nice gains, I finally saw my heads today for the first time. I'm pretty excited to get them on.

 

The stock intake valve on my 5.3l was 1.89" according to WCCH. The problem with going to 2.00"-2.02" valves is when open, the valve is very close to the cylinder wall on the 3.780" bore and shrouds it anyway...
Thanks

 

Thats why you need a bigger bore

Nice gains glad to see as et of Richards heads putting out some numbers.

 

Thanks for posting your results Stan. You've made a very nice gain. I'm impressed that a 327cid engine can make so much power in a truck type application. As Moregrip mentioned above, it's always nice to see gains across the board. Nice job on tuning the engine too! Fuel curve looks superb.

Richard

 

Hey Richard what do you honestly think you could do to a set of 225 DART heads I havent even gotten the setup I ahve right now running and am already thinking about changing it it

 

Thanks to all for the compliments, and thanks to WCCH for such nice performing stage1 heads. One thing that really impressed me is the airflow gains I achieved here at my altitude 2350-2400ft elev. relative to the dyno shop in chatsworth 750ft elev. The grams/cylinder delta is much smaller now between here and there (ie. my Tahoe runs almost as good here as it does near sea level).