408 on the dyno friday

[maze2525]

Well its been over a year now since the 5.3 took a dump on me but the 408 is in and ready for tune. Went all forged, Afr heads, with this cam
INTAKE EXHAUST
DURATION @ .050" 23* 24*
ADVERTISED DURATION 28* 29*
LOBE LIFT 0.38* 0.35*
GROSS VALVE LIFT 0.649 0.609

LOBE SEPARATION 111
ADVANCE GROUND IN 1

OPEN CLOSE
VALVE TIMING @ .050"

INTAKE 8 BTDC 51 ABDC
EXHAUST 52 BBDC 10 ATDC
hopen good #s ill keep posted on this for ya

[maze2525]

well its at 464 but its not geting enough air up top. so im guessing the cold air i got for the 5.3 isnt big enough along with the stock mass air... Its also throwing a code at 6200 and i cant fig out why any help on this. i cant remeber code off topof my head ill get it tomarrow

[NAREJEPP]

are you running the stock 5.3 MAF? that might be the problem. need to go bigger!

[George C]

so a MS4 in a 408?

im betting torque is around 415-422

your numbers are about right for that combo,enjoy your combo

[GraniteBlueNNBS]

I would think a bigger cam would be in order for those cubes.

[maze2525]

so a MS4 in a 408?

im betting torque is around 415-422

your numbers are about right for that combo,enjoy your combo

Yes you are correct. The tq was 424, but still can't understand why its throwing a code one time at 6200 then the next time its not. And yes its still the 5.3 maf who makes a bigger one? Im not getting enough air threw it for the top end

[George C]

all the mafs are the same for the gmt800 trucks. if maf size is restriction time to go SD

Yes you are correct. The tq was 424, but still can't understand why its throwing a code one time at 6200 then the next time its not. And yes its still the 5.3 maf who makes a bigger one? Im not getting enough air threw it for the top end

[maze2525]

So no one makes a bigger one for these trucks..... and y sd thought they went away from that for a reason.... just askn questions cause this kind of build is all new to me. Is it cause its n.a? I plan on turbo and cam for turbo later on. Is the sd what everyone doing for trunk also?

[George C]

you can get a 100mm maf but what is the point? youre not going to gain performance from it, if you want to spend another few hundred dollars on a part that isnt going to gain you anything then go right ahead.

So no one makes a bigger one for these trucks..... and y sd thought they went away from that for a reason.... just askn questions cause this kind of build is all new to me. Is it cause its n.a? I plan on turbo and cam for turbo later on. Is the sd what everyone doing for trunk also?

[flaco]

i was about to say the same on cam, being an ms4...like quik mentioned.....lol

good # enjoy your new found power