Yeah I got an '85 TA pretty must stock, it has a 305 4bbl. I know generally you should run high octane in these engines, but would it make much of a difference to have higher octane like adding NOS racing booster, and if so is it safe to add more than 1 bottle per tank?

 

that motor need no higher than 87 octane...I don't think the compression in that motor is higher than 9:1, don't waste your money on high octane stuff, you will not see or feel a difference.

 

87, 92, 100 octane gasoline all have the same BTU per gallon so there's no more energy in a higher octane. Octane is the fuel's resistance to detonation. Running high compression or a power adder can cause low octane fuel to ignite under compression before the spark plug tries to ignite the fuel. A higher octane keeps that fuel from igniting under compression.

You will make more power from a higher octane if the engine doesn't like low octane but you only need as much octane as to keep the fuel from detonating. If you don't get knocking with 87 octane, anything higher will just make your wallet lighter.

Those "octane boost" bottles raise the octane level 2-3 points. That means it raises 87 octane to 87.3. By the time you spend enough on those additives to increase the octane levels up high enough, it's cheaper to just buy the higher octane fuel.

Very few standard production cars are made that need to run premium fuel. There are a few specialty cars that need it but generally, any production car will run fine on 87 octane. At least until you start doing changes.

 

Couldnt have said it better. Alot of people have the general idea that since it is more expensive, it has to be better. Higher octane is not cleaner, it is not more pure, it does not make your car perform better (unless it NEEDS it, which your car doesnt). It is just harder to detonate. I just wish the general public knew this, the amount of money wasted on gas you do not need to run must be rediculous.