Tying the frame.

[Pancho79]

I'm tossing ideas around for an LS build for my 79 Firebird Trans Am. Some builds run higher HP numbers than others and I want to know how much I can put down without needing to stiffening up the frame and body so I don't twist the car. So far I'm tossing it between a 5.3L base and building the top end for ~400-450HP, or a 6.0L base and doing a 408 stroker build for ~500+HP.

One of the guys at my shop has been doing high horsepower drag racing for decades and he says putting down ~500+HP means I would most likely need to get frame connectors. I don't plan on racing the car I just want a good 'n nasty street car. Does anyone have experience with a 2nd Gen F-Body running these numbers?

[Z06vet]

I would install subframe connectors regardless of weather you change the motor. Probably one of the best mods I have ever made.

[bryant]

subframe connectors make everything better on the car. it will stop better, turn better and accelerate better. the doors usually close better.
less flex in the car makes for better response from the car.

[Pancho79]

Understood. Thanks, guys!

[astroracer]

Weld in connectors work better then bolt ins but either method will provide benefits. Just have the car sitting on the tires when you put them in. You want the car to be as close to it's "at rest" attitude when doing the install because any tweaks in the attitude will tend to remain there after the connectors are installed. Especially with welded connectors.
Build a stack of 4 x 4's to set the car on when doing the work. Astack of thre or four will raise it a foot or so and provide the room to work under the car comfortably.
Mark