got a 97ta with a golen 383 with lloyd elliot ported lt4 heads with an ati procharger (d1sc) target goal is 750fwhp chad said the engine alone is worth 500hp i've done my research i'll be running 14psi of boost now i've converted my car to auto with a th400 BUILT !! with transbrake, reverse manual valve body, ultrabell and a hand built torque converter ! i was told the car will be good to 6500 rpm i've got a 3000 stall converter in right now my car has 4:10's out back but i think that may be too much gear ! the car will be driven around town trailered to the track .QUARTER MILE ! what other info is needed ?

 

i'm thinking 3.73, but if you get some good trap speeds (and you probably will with that kind of power) you may even need to drop to a 3.42.

3.73 will have you topping out at 133mph.

 

Use this link www.f-body.org/gears to play with some numbers.

With stock tires (25.66"), 4.10's, and a 6500 RPM redline, you're looking at ~121 mph top speed in 3rd. With your engine, you'll likely surpass that. A lot!!

27" tires will get you to ~127 mph. 28" tires will run to ~132 mph.

If you go with 3.73's, you're good to ~133 mph with stock size tires! (~26") If you still needed more top end out of 3rd, you could do 27" or 28" tires and get as much as ~145 mph out of the car.

I honestly don't know how fast to expect your car to be, but you "might" even have to consider 3.42's possibly??

 

He will trap much lower than what the calc shows due to slippage at the tranny. This is not considered in the calculator.