Nhratp

i am building a 13.5-14.5 compression. 525 bbc engine. i have 427 tall deck block and 4.375 stroke crank. any suggestions on the longest rod legnth i can use for max hp and torque for drag racing?.i am considering 6.7 or 6.8 rod length.i will ocasionally spray up to a 400hp shot of nitrous as well.thanks