Pics just found, I don't remember this.

HOW THE DODGE BOYS CHEATED
There's only a very few that know exactly how the Dodge Boys accomplished their cheating in NHRA PRO STOCK back in the 90s when they were winning so regular.
It was done using NITROUS OXIDE(Laughing Gas) as described here.
The Nitrous was carried in the block water jacket of the engine with water only in the heads. The water compartment which would contain the Nitrous was drilled into one of the main bearing saddles and on the exact opposite side another drilling was made thru the main cap and upwards into the intake ports.
The crankshaft main corresponding to the drilled main saddle was cross drilled so that when it rotated the drilled ports would line up and allow the pressurized Nitrous to flow through all these drillings and upward into the intake ports. How was it pressurized? Very simple, it was put in at normal temperature of about 80 degrees and when the engine fires and starts warming the Nitrous pressure rises and starts to flow.
Now there is also a spring loaded relief valve preset at a pressure which allows the Nitrous to flow only when the pressure rises from the engine heat.
So you might wonder how the supply is replenished. OK, a special charging gun is used that looks exactly like an ordinary grease gun and there is a special alemite fitting installed in the block with a drilled passage way to the water jacket. So when a pit crew member is putting in Nitrous it appears that he is simply greasing the engine.
You might also wonder about the Nitrous continuing to flow after each run; no problem it simply leaks away until it is all gone or until the pressure drops and the driver laughs all the way back to the pits.

:wtf::eek: