Hello, I have an 83 Grand Prix with a GM 305 LG4. I was made to understand that the LG4, doesnt breathe that well, so I am considering getting headers (acutally, mostly for more meaner sound, but power too ). I have been told however, that adding headers will make the car sound alot better, but that I would lose some power, because the enigine doesnt breathe well to begin with. Only power adders I have are a K&N air cleaner, dual high flow cats and dual Flowmaster 40 series, everything else is bone stock. Does this sound right to you techies? Do you feel I would lose low end power? Thanx in advance.....

 

I dont feel the you would lose power. Your engine doesn't breathe well to begin with, and isnt the concept behind headers making the engine breathe better?? So therefore, wouldn't you gain power?? Seems to make sense to me, the only argument that I could see is you may lose some back pressure. Right now your engine is taking in enough air to run well in the stcok trim, but when you add headers it will flow the air out better, but still be taking in the "factory" amount of air, causing you too lose back pressure and therefore losing horsepower?? Does that seem right to anyone else??

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88 GTA
L98 350
700R4
3:27 axle
MODS,
Edelbrock TES headers, 3" straight pipe, Flowmaster 80 series, K&N filter, Accel 8.8mm wires, Bosch Platinum plugs, Wells cap and rotor button, Wells ignition module, MAF screens removed, Hypertech TB air foil, Thermomaster stage II chip, 180* Powerstat, Hypertech cool fan switch, B&M shift kit, B&M power clutch pack, B&M servo, GM fuel filter

 

Yes, the headers will make it faster. I put edelbrock headers and Y-pipe on my LG-4 and lost about 2-3tenths in the quarter. They claim that it drops your 0-60 by .55 seconds. I would do it agian in a heart beat. The whole setup cost me $317 after taxes.

 

whoever told you that needs a brain transplant. how would increasing breathing ability hurt an engine that doesnt breath well to begin with. There's a moron amongst your ranks- buy the headers

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104

 

Moving this topic to the Exhaust board