Indexing your spark plugs is another way of gaining you a few extra horsepower. The object is to get the open-end of the gap facing the intake valve, or at least facing the open area of the cylinder. If a spark plug's ground strap is facing the intake valve or the cylinder, it kind of blocks the flame travel, which impairs the burn path thus causing a loss in power. By facing the open end of the gap towards the intake valve, it faces the spark right at that charge and promotes a better burn. It can be a 6 - 8 horsepower difference in some engines by indexing the plugs. Now, index a set of side gapped plugs and you just made an additional 10 - 12 HP (in most cases) for free. Little things like this is what makes one guy faster (or quicker) than the others. It all adds-up!
Another thing you can do is to not run a high volume oil pump. Most street and street / strip guys believe you just HAVE to run a high volume oil pump. The reality is, you don't! Standard oil pumps pump plenty of oil and have plenty of pressure to support most mild performance engines up to 6,000 RPM. By installing a high volume oil pump you increase the drag on the engine while it is trying to turn that pump to push that additional oil which robs you of power you didn't need to lose.
Another way to gain a substantial amount of power is to remove your power steering pump and convert your car over to manual steering. I don't recommend this for daily drivers because the steering will become harder. Most stock power steering pumps can easily suck-up 20 to 30 horsepower. Don't believe me? Turn your steering wheel a little, side to side, while your engine is idling and hear the idle drop a hundred or so RPM. How much horsepower do you think it takes to lug your engine down that far? Yeah... about 20 or 30. So you say you aren't "steering" while you're driving down the drag strip? Well, every time your car gets squirrelly off the line, you have to "correct" it by steering, and there went 20 to 30 horsepower. If your car doesn't get squirrelly, maybe you should call us and order a BAD-ASS Engine and then you’ll be fish tailing! LOL
Another way of gaining about 8 to 10 HP is by draining about 1 quart of oil out of your oil pan. Most cranks dip into the oil a little which is why windage trays work so well and get you more power at RPM. They keep the oil away from the crank which makes less drag. When the engine is full of oil, it is like wading through knee deep water. Try to run while in knee deep water. It isn’t that easy because of the drag the water puts on your body. When you drain out 1 quart, this makes the crank less deep in the oil as it spins. It’s now like walking in ankle deep water. Try to run now, it’s a LOT easier than it was when it was knee deep, right? Well the same principals are at work here as well and will make you free power. Switching to a slightly thinner oil is another way of gaining power. This puts less drag on the crank as it dips through it in the pan as well as makes the oil pump spin easier and much more free which in turn, takes less power to spin.
Only do the power steering belt trick at your own risk. If you crash because you couldn’t steer because your steering was too hard while the belt was off, that is your fault, not ours. If you don’t know exactly what you are doing, then don’t do it!