I HAVE A NICE RARE 360 OFFENHAUSER INTAKE AND A 750EDELBROCK CARBURETOR.AND I WOULD LIKE TO ADD HEADERS FOR A BETTER FLOW.IS THIS A WISE CHOICE.MY CAR IS A 4DR OLDS DELTA88.425 SUPER ROCKET ULTRA HIGH COMPRESSION.450 TORQUE AND 310 HORSE.PLEASE ALSO TELL ME HOW MUCMORE HORSE AND TORQUE WILL I GET FOR ADDING ALL OF THIS.AND I DONT WANT TO TAKE AWAY FROM THIS STYLISH SLEEPER.BUT I DO WANT MORE POWER.

 

should be about 350 horse 470 lbs of tourqe.try a perfomace cam and doulble roller timing chain and steel gears.

 

The year of car was not given but seems like you have a 65,66, or 67 Olds....therefore headers cannot be bought for your car. The best you can do is factory dual exhaust manifolds and a dual exhaust system. It will help HP greatly. The left side manifold you need is often sold on Ebay. It is being reproduced. The passenger side manifold remains and the center crossover hole plugged.

 

As Oldsmaniac said "after-market Headers" are NOT an option unless you are a Die-hard Olds nut. My Brother, Nephew and I like the B(big)Bodies. We did put G-Body 455 headers on his 67 Delta 88 Custom, a "little" modification" was required. Do away with the rear steering box, put a rack & pinion from a Capri, Mustang II won't work, they are different, one header tube goes out-side drivers' frame rail and frame was notched. It is a "streetable" but drag=race only car. I take Toro exhaust headers,cut them. rotate 180 degrees and Ni-weld, very good flowing "factory" header. My 67 LS 98 has this system, 4680# and runs 14:18 @ 100 mph. #3 option, this is your EASIEST choice. Factory drivers-side, decent flowing but there is some "roundy-roundy" but not a bad price. Good Luck, Ken http://cgi.ebay.com/ebaymotors/1965-...79929798QQrdZ1

 

Eggzactly what I did for my '69 Delta, worked out great with 3" exhausts pipes but in retrospect probably would go with 2.5".