new motor

looking to build a new motor. its for a class your are lemited on ci to 525 and a 4150 carb and a plate nos system and run on a 275/60/15 drag radial.what would be the best way to do a 525 big bore and short stroke or long stroke small bore.i have a set of p51 heads and the new trick flow 4500 intake going to run a spacer for the carb the car has to way 3300# and has a jet lemit on the nos system also needs to run 5.30 to 5.50 thank you for the help

Big bore for sure. What is the limit on the NOS jet? You could do a 4.625 bore, 3.85 stroke deal and it would be 517 inches and would make a ton of power up top, and the nitrous would supplement any torque loss on the bottom. Given the limited tire I think this would be a good option for you. I figure it will take 1150-1200hp to et at that weight. Get yourself a 7531 with a power grid and you should be in business.

the jet comes out to be like 210 i forgot the # sorry i can not use the 7531 or pwer grid limited to just a dig 6 and no digets or nos controllers

any rules on plate type? amount of spray bars? solenoid? line sizes etc?


There are also a lot of little things a guy can do with the rest of the car to make it faster also............



This sounds a lot like a similar class we have around these parts.

bluecoupe wrote:the jet comes out to be like 210 i forgot the # sorry i can not use the 7531 or pwer grid limited to just a dig 6 and no digets or nos controllers

A 210 is huge ... A 110 is like 350 so if that is indeed the rule then your good. Can you use a cross hair plate? Your suspension will be key. Hit up Yellowhorse on here, he's real good with the small tire stuff.

bluecoupe wrote:looking to build a new motor. its for a class your are lemited on ci to 525 and a 4150 carb and a plate nos system and run on a 275/60/15 drag radial.what would be the best way to do a 525 big bore and short stroke or long stroke small bore.i have a set of p51 heads and the new trick flow 4500 intake going to run a spacer for the carb the car has to way 3300# and has a jet lemit on the nos system also needs to run 5.30 to 5.50 thank you for the help

is there a rule on which deck height,block,or head you have to run? spacers under the carb sometimes cost power

its 210hp sorry.deck has to be stock and stock bore space has to be 1 nos and 1 fuel solenoid and no cross plate.

So a .080 jet then or there abouts. The above combo would work fine as long as you get it to hook, might be a touch easier with A heads, but if you have P51 heads I certainly would keep them. It's gonna be a big compression deal too, and the Q if it's allowed. Big shot, or Steve Johnson plate, probly the latter.