Hi to all I am currently in the process of deciding what to do. I am thinking of running a smaller single stage shot of nitrous. Possibly a NOS sniper nitrous system adjustable between 100 to 150 hp. I am working on building a 455 for the swap and just want a little juice for the hell of it mainly. I don't think I'll use it very much but just in case I want it to be functional and not take a chance on ruining the engine. Are there any internal parts that are required to be changed to run nitrous. I am thinking stock crank H-Beam forged rods, forged speed pro pistons and rings. Is there any spechial tips when building the engine ring gaps or anything spechial for the use of nitrous? My second problem, does anyone have any experience with steel sleeves I am affraid that I may have to sleeve one of the cylinder walls is it better to do all or just one or throw the block away, would it affect regular use without nitrous, with nitrous? The last and fianl answer how do I go about installing the nitrous kit anything to be super careful about? SORRY for the long post I hope some people can help with my ?'s Thanks alot James

i wish someone had the energy to write a tech article on this.. or a 'read this before you post' type thing.. maby there is and i missed it(along with everyone else). grab a summit magazine, order a book in the back of it that talks about nitrous. its a better reference than you will get most other places. you dont need an exotic engine to run nitous, it needs to be tuned right: ie. you need enough fuel. also a book by david shelby, something like 'hot rodding thirdgen camaro's'. i have the book, just cant remember the name. it is very good.

I would get a cheater level nitrous system for a street 455
Even to run at the lower power levels. It only costs a little more
and you'll probabily soon tier of the 150 hp level of a base kit.
That's just a tune up on a 455. ( 175hp and higher need high octane fuel for best performance Install a separate fuel pump and fuel line from tank to plate for a Cheater level system) The forged pistons and good rods are a good idea on a stout 455, nitrous or not. Ring gaps
vary acording to piston material and manufacturer, They are the best source for a recomendation. Generally a 150 hp shot is fine with the recommended N/A performance ring gap provided by the piston manufacturer. Large doses of nitrous need extra ring gap.
The gap will be as normal while under power because of the extra heat of combustion. I would pass on a block that needed to be sleeved, for a Pontiac 455 build up. There are lots of these blocks in the wreckers.