[decooney]

Jerry,

I run a 428 as well, with a 1/2 point more compression using aluminum heads, and a bit bigger cam, and have the extra 100hp you are looking for. You might try working with your heads, intake, cam, porting/port-matching, and carb matching a bit more first before trying NOS. Getting your FE to pump air is the key.

If you must try NOS, you might give Tom Lucas at FE Specialties a call. He builds FEs for all sorts of applications (mild to wild), including race/NHRA. He has a 15:1 FE/427 motor going in one of his two race Mustangs he is working on this year. He'll be able to help you. FE Specialties contact #: 916-339-0427.

One other item to consider is TIRES - when adding more horsepower. You can add 100hp, but will need to make provisions for tires that will actually put it to the ground - especially on twistie roads. My last Unique with a 428 with a bit less horsepower was actually more (manageable) driveable in some ways - off the line, twisty roads, etc. On my current ERA, with more HP, I jumped up to stickier tires - and it can be a bit scary at WOT. To me, anything over a "true" 450hp+ starts to become a handful at times. I'd vote for the HP heads/cam/carb route vs. doing NOS. Good Luck.