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08-29-2009 05:47 PM #1
454 fiero
high this is my first post on here so i First thought I would introduce my self. Im percy, I just bought a pontiac fiero with a 454 mounted on a 71 eldorado tranny. the car has been done up really well the motor is a late 70's truck motor. It has been redone. has a .30 bore mild cam roller rocker kit. jackson peters drive gears hi flo oil pump. oval port heads an i belive it has a 750 holly 4 barrel carb. I dont know much about motors. but at first thought when I bought the car i thought that the motor would be scarry in the car. I thought that it would have tons of power an low end torque. but I would have to say i have been very disaponted in the motor. it is 100 % new an rebuilt. The owner said that it would need to be tuned said the valves an timming would have to be done.
Ok so I have got the timming so that there is no pingin or tinging sounds when I drive down the road with the car.It doesnt sound like there is any valve noise really coming from the heads. There is a stutter in the throttle when you step on it from a stop an try an get on it. it kinda gets doggy. it comes out of it but I can help but think that there should be alot more pull in the set up then what it has.
So my question is this. How would i adjust the carb on it is there a way to reduce the fuel going in to the motor. The car gets about 7 miles to the gallon. everyone says that it should be more like 12-15. So i think that the motor is getting to much fuel. If that was the case could that make the car run at a lot less or the motors over all potential. also could valves being off also create a lot of power loss. the motor should have I would think like 330 350 Hp an in the 400 range of torque which sould burn a tire at the very least. an I cant even burn a tire. If you have an ideas please help me out.
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance