[Mertz]

I have my 72 Chevy truck 350 set up with the Qjet all dialed in and get great accelleration. I tried powerbraking it and doing a full throttle takeoff and it launches rather slow and then once it gets going it goes great. At one point I had it standing on its wheels but I haven't been able to reproduce that since. I don't have the 350 trans kick down installed and I have a stall converter set up for towing. 2500 if I remember correctly. I can do a nice burnout if I am turning when I take off with or without the power brake. It just seems like it doesn't have much power as I hit full throttle but as I get going I hear the secondaries working. 50 to 70 takes just a few seconds without the secondaries. The truck does not have a posi.
Is the problem the kickdown?

[turchiac]

What is your timing set at?

[Mertz]

12 initial 34 with mechanical and about 50 total all in at 3000. MSD Ready to Run. Tall 16" Uniroyal LT tires

[b00tz]

just hold the brake and feather the throttle like this:

http://www.youtube.com/watch?v=HCaj2gFXnfU

that was my truck with a 350 and a q-jet,mines got a 4-speed though.

[turchiac]

What is your gear ratio? Could be your gear ratio isnt low enough with your tall tires.

[Mertz]

I think the gears are 3:08 or 3:28 but I don't know for sure.

[b00tz]

you should still be able to do a burnout with 3.08's are you leaving it in 1st gear or tryiing it in drive? mine had 3.08's in that video.

[Mertz]

I am leaving in drive. Shouldn't it automatically be in low taking off? It feels like it shifts while I'm holding the brake. I tried rolling backwards and hit the gas yesterday and got it to let go for a short distance.

[68NovaSS]

Originally Posted by Mertz

12 initial 34 with mechanical and about 50 total all in at 3000. MSD Ready to Run. Tall 16" Uniroyal LT tires

And you haven't hammered the pistons out yet? Fifty degrees in at 3k?

[1ownerT]

[QUOTE=Mertz]I am leaving in drive. Shouldn't it automatically be in low taking off? It feels like it shifts while I'm holding the brake. I tried rolling backwards and hit the gas yesterday and got it to let go for a short distance.[/QUOTE]

I won't take too many of those and the drive shaft will drop out of it or the diff will let go.

[Mertz]

Yes I know this is not good practice but I wanted to see if it would work. I barely had it rolling backward when I put it in gear and hit the gas. I know now how those rice burner make those J burnouts that look like they were going backward while doing a burnout then forward leaving a track like a J.

The 50 is all in with mechanical and vacuum. It is not likely that I have the vacuum advance when I step on it since it goes to almost zero but the mechanical is picking up with the rpms. If I hold it at 3000 and it has vacuum and mechanical advance it is at 50 which I understand is correct for a 350. I am running the vacuum advance off manifold vacuum.

[dinger]

If you want to do a hairy burnout, do it like the pros do, start on water. it will save on equipment. Pull it down into low, pull the back wheels into a good wet spot, power brake it til the rpms hit about 3000 and let off the brake and bury the throttle. You should be able to fry the tires pretty good!

[American Muscle]

Whats the purpose of you wanting to do this.

[Mertz]

I don't think I am ever getting it to rev to 3000. It seems to bog down when I power brake it. The main reason for wanting to do a burn out is so I know I have enough low end torque to pull my 5000 lb trailer. I figure if I can break the tires loose I should be good on torque. I figured that with 1.5 roller tip rockers, Edelbrock 2101 manifold, ceramic coated headers with dual flow through exhaust and H pipe, rebuilt transmission with stall kit, timing at the optimal 36 initial + mech, MSD Ready to Run distributor, new Moroso spiral core wires and dailed in qjet (couldn't do it with the 1406 Edelbrock either). I think I should be at about 290 hp and should be able to break them loose. I have been trying to build low end torque and it would appear that I haven't been successful if I can't do a burnout from a standing start.

[matts37chev]

Whats the purpose of you wanting to do this.

now dont tell me you've never just wanted to do a big smokey burn out