Just Add The Code and The Value To self setClientDvar( if You Dont no how to do that, you dont deserve to have a Jtag.
For Lazy People Here:

self setClientDvar( "scr_heli_loopmax", 999 ); //LukeUK
self setClientDvar( "scr_heli_armor", 9999 ); //LukeUK
self setClientDvar( "scr_heli_rage_missile", 99 ); //LukeUK
self setClientDvar( "scr_heli_maxhealth", 9999 ); //LukeUK
self setClientDvar( "scr_heli_missile_max", 999 ); //LukeUK
self setClientDvar( "scr_heli_turretClipSize", 99 ); //LukeUK

Unlimited Helicopter and Shoots Alot
But You can Add Alot More!
You Can Do Alot of Your Helicopter Here
These are Default Values, Make teh Values To Your Liking

"scr_heli_loopmax", "1" );// how many times helicopter will circle the map before it leaves
"scr_heli_missile_rof", "5" );// missile rate of fire, one every this many seconds per target, could fire two at the same time to different targets
"scr_heli_armor", "500" );// armor points, after this much damage is taken, helicopter is easily damaged, and health degrades
"scr_heli_rage_missile", "5" ); // higher the value, more frequent the missile assault
"scr_heli_maxhealth", "1100" ); // max health of the helicopter
"scr_heli_missile_max", "3" ); // max number of missiles helicopter can carry
"scr_heli_dest_wait", "2" ); // time helicopter waits (hovers) after reaching a destination
"scr_heli_debug", "0" ); // debug mode, draws debugging info on screen
"scr_heli_targeting_delay", "0.5" ); // targeting delay
"scr_heli_turretReloadTime", "1.5" ); // mini-gun reload time
"scr_heli_turretClipSize", "40" ); // mini-gun clip size, rounds before reload
"scr_heli_visual_range", "3500" ); // distance radius helicopter will acquire targets (see)
"scr_heli_health_degrade", "0" );// health degradation after injured, health descrease per second for heavy injury, half for light injury
"scr_heli_target_spawnprotection", "5" );// players are this many seconds safe from helicopter after spawn
"scr_heli_turret_engage_dist", "1000" ); // engaging distance for turret
"scr_heli_missile_engage_dist", "2000" ); // engaging distance for missiles
"scr_heli_missile_regen_time", "10" ); // gives one more missile to helicopter every interval - seconds
"scr_heli_turret_spinup_delay", "0.75" );// seconds it takes for the helicopter mini-gun to spin up before shots fired
"scr_heli_target_recognition", "0.5" ); // percentage of the player's body the helicopter sees before it labels him as a target
"scr_heli_missile_friendlycare", "256" );// if friendly is within this distance of the target, do not shoot missile
"scr_heli_missile_target_cone", "0.3" );// dot product of vector target to helicopter forward, 0.5 is in 90 range, bigger the number, smaller the cone
"scr_heli_armor_bulletdamage", "0.3" ); // damage multiplier to bullets onto helicopter's armor
"scr_heli_attract_strength", "1000" );
"scr_heli_attract_range", "4096" );