My camshaft is robbing me!

[gbodyera]

Im having problems with my power accesories from my cam. I have a Comp Cams 279THF7 cam. It has a .479/.465 lift and adv duration is 279/297 and @.050 duration is 227/241..

It runs nice and strong at idle in park. As soon as I put it in gear its real choppy and the rpms drop a couple hundred. My vac is reading anywhere from 10.5-12 pounds of vac at idle. It doesnt really change in gear.
-I have checked everywhere for vac leaks with carb spray and found none.
-Tried timing from 6 to 16 initial and 36 all in. Im now at about 16 initial and its the best so far.
-Checked all lines & hoses and no problems.
-Carb is adjusted all around.
I also noticed with my power steering, when I turn the wheel some the idle drops a little.

I read around some and I think my cam is the culprit and is robbing me. Would a vacuum reservoir canister help me out or am I basically screwed?

T.I.A.

 

[LS6 Tommy]

That's a decent amount of exhaust duration. Unless you have a really wide lobe separation angle (over 112*), to me your idle vacuum seems about right.

Tommy

 

[gbodyera]

Im thinking maybe the carb's too big then.

My last engine I slapped a Holley on it and in gear it shut right off. I took that off and put an Edelbrock on and everything was better.

 

[Betcha618]

YOU CAN'T JUST "SLAP" CARBS ONTO AN ENGINE AND EXPECT IT TO RUN RIGHT. CARBS HAVE TO BE TUNED TO EACH INDIVIDUAL ENGINE. 10.5 TO 12 INCHES OF VACUUM, (I WISH I DID) I HAVE ABOUT 6 INCHES OF VACUUM AT IDLE. N MY CAR IDLES FINE IN PARK AND DRIVE.

I THINK YOUR "CULPRIT" IS YOU NOT KNOWING HOW TO ADJUST A CARBURETOR.

 

[gbodyera]

I did all I could do like set the mixture and float levels.

 

[Betcha618]

Im having problems with my power accesories from my cam. I have a Comp Cams 279THF7 cam. It has a .479/.465 lift and adv duration is 279/297 and @.050 duration is 227/241..

Im running a Comp Cams XE284H in my 350
.507/.510 lift
284/296 advertised duration
240/246 @.050
Lobe Center Angle 110

 

[Betcha618]

Holleys have power valves that open under a certain vacuum. If you had a 13 power valve in there n ur engine only pulls 11.5 inches at idle your power valve will be open at idle thus flooding the pi$$ out of your engine. when you put it in drive ur vacuum might drop, thus opening the power valve prematurely and making it idle like crap.

 

[gbodyera]

I dont think it was flooding at all.

 

[Betcha618]

why do you think it was running like sh*t in gear then ??

 

[gbodyera]

You have a point my friend!

Thats why I come on here to you guys with all the experience.