have headers woken up your 305?
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Car: 88 GTA Notch/01'WS-6 VERT
Engine: 5.0 LB-9/5.7 LS-1
Transmission: 700R-4/4L60
Axle/Gears: borg warner 3.27's
have headers woken up your 305?
just wondering if anyones noticed a significant hp gain in there stock 305 tpi with just adding headers and a cat back system? I have a full stainless SLP tol cat back and coated air tube headers.
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: have headers woken up your 305?
Headers and 3in exhaust will wake up any engine in a 3rd gen because the stock exhaust is strangling the engine. I had an Lg4 once I put headers on it and it went from barely spinning tires on a launch to lighting them up. Headers cut a half second in the 1/4 on a 350 build I had in an 87 GTA.
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Car: 1986 Iroc Z28
Engine: 305 TPI
Transmission: 700R4
Re: have headers woken up your 305?
I'm with the above post- I installed hooker shorties and 3in all the way back, removed the cat and noticed a much better preforming engine. I installed a cutout in place of the cat and other than for the sound, I'd skip that if I did it again...you notice a good drop in torque with it open. But it screams when its open.
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Car: 1987 Trans am
Engine: 305 TPI
Transmission: 700r4
Re: have headers woken up your 305?
Headers will help a little. Usually about 7-10 hp only but they will make it sound much throatier.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: have headers woken up your 305?
Not sure where you came up with the 7-10 HP number. Its more like 15-20 HP with decent headers on a decent exhaust system. I have seen even mild 305s and 350s pickup over 40 ft/lbs of torque in parts of the torque curve as well.
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