i run 13.8 @ 102 on a crappy 2.3 60' foot time

had to let off the pedal 3-5 times trying to get it to stop spinning

low 13's are in this car no problem at all

so yeah low 13's are easy with an bolton lt1 , but almost ALL lt1 run low 14's stock

 

I just ran a 12.5 on my bolt on lt1 that weighs 3660 with me in it. I didn't even do roller rockers. Its all about traction. Here is my website with info.
http://members.fbody.com/furely/

 

Mods in sig... best N/A time is 13.472, broke my poly tranny mount on the next run so I know it was stressing on that run. My 60' could have been better on that run too, but my posi is toast, so I barely did a burn out because I didn't want to heat up just one tire. And if you look at the fluid in my rear, there is metal everywhere, gears are on there way out too.


With a good posi unit, I think I'd be good for 13.2xx N/A.

 

I ran a 13.59 @98.69 with a 1.82 sixty ft. last weekend with the serpentine belt on. I don't even have headers yet and have never been under the valve covers. Other impala guys told me that swapping to Tri-Y or Long Tube beaders are worth .2-.3. I do have a 3200 Vigilante and 4.10s and plenty of bolt-ons. Oh yeah, this is in my 4300# 96 Impala SS I have dyno'd only once and got 255rwhp/320rwtq before the 4.10s and aluminum driveshaft, but with the serpentine belt and air filter off. The iron head LT1 has a much smaller cam than the rest and only put out about 260hp/330tq from the factory

 

The headers (lt's) are going to give you 25-30hp and 30-35tq, the rockers are like 12-16hp and 8-10tq. So potentially your looking at a 50 hp/tq gain. That is a .5 off your 1/4 time. With very good traction it could be more. If you buy those two mods over winter your going to be a happy guy. go for it.

 

When I had-

K&N intake
Meziere waterpump
SLP single cat headers
Off road pipe
Flowmaster catback

13.5X @ 103.7

 

The longer the primary tubes, the lower in RPM that the headers become effective.

So long tubes are more effective at lower RPM than either shorties or mids.

Dan

 

I ran the time in sig with a 3000 foot density altitude. In the winter with nittos I'm shootin for high 12's at 105+.

 

Long tubes & roller rockers make a huge diff on a stock LT1
60ft = 1.80
ET = 12.61
MPH = 108.60

 

I ran 13.5 at 107. Stock exhaust, stock motor. Mods: UD Pulley, Madz OBDI tunning, 3.90 gear (m6 car), Electric Water Pump, K&N, Z06 MAF, Eibach Springs, Subframes, Spohn Driveshaft, Spohn 1" rear sway bar. Car is 97 WS6 M6 and was full weight on street tires.

 

97 M6 Formula w/ cat back, air foil, CAI = 13.62 @ 102.8 / 2.12 60ft

Same car, Mods above + LTs, Crappy ypipe= 13.40@ 104.98 /2.28 60ft

I cant launch the car for crap but with a nice rear and tire...12 are very posssible!!

 

so if lts produce more low end power how would lts with dumps before the rear axle work, what kinda power would i get from those

 

With the following mods, I went 12.82 @ 106 MPH with a 1.73 60 ft. with my '93 Z.

93,000 mile completely stock LT1
stock exhaust manifolds.
stock rockers
stock FPR
stock t-body
stock water pump

In other words, the only mods to the engine were:

Splitfire plugs
MSD 7AL-2
MSD "Blaster" coil
Taylor 8 MM wires
SLP throttle body airfoil
Hypertech "generic" chip
Moroso CAI

I did have a 10.5" 3200 stall ProTorque converter, and 4.10 gears.

The car was full weight (3448# with me in it) Still has A/C, back seat, and bumper supports. The only weight reduction was the front sway bar, and the wheels/tires.

Suspension? COMPLETELY stock! All 93,000 mile GM original stuff. I removed the sway bar, and bolted on a set of 26 x 10.5" M/T ET Streets.

Frank