The Crosman model 454 was made between 1977-1982, in two variations it was modeled after the Colt Woodsman. It is a 16 shot BB C02 pistol. It good condition it is worth between $25 - $30.
The model 454 was made between 1972 - 82. you did not state the condition of the pistol so it is not possible to answer you as to the value,
Model 454 Mfg 1972-82. Crosman no longer repairs this model but you can search the web under "Air Gun repair" and find a location near you to repair it. However remember that this gun in PERFECT condition is only worth about $50 at best.
See the link below for the Crosman 454 Owners Manual.
It was made between 1978-82. State the condition of the pistol to get an estimate of value. Is it still working? Rate it poor to excellent or like new?
This pistol was made between 1978 and 1984. Crosman no longer supplies parts for this model, But the offer a free service to locate shops that repair older Crosman air guns. See the link below
it depends on what year and model the motor is? the 90' silverado ss 454 had 230hp
There is no way to know how much it is worth. Lets look at it this way it is worth however much the buyer is will to pay for it.
On order to give you an answer, you need to give more information about the BB guns condition. Give it some sort of rating like Poor, fair, good, very good or Excellent. Then I may be able to give it an estimate of value.
Crosman stopped making this gun in 1982. They no longer have parts available, however you can still get it repaired by an outside source. Try checking the Web. Search using "Airgun repair." find someone near you and contact them. See the link below. The seal kit is $13.99.
Try nada.com
According to one site, a US bill weighs 1 gram. There are 454 grams in a pound, so a pound would haven 454 notes. 454*200 would give you 90,800 $20 bills which would be worth $1,816,000.