[NHRASuperStock455SD]

Horsepower = cfm x HPfactor x 8

HP Factors
reg Bracket Eng .240
Good Bracket Eng .250
Super Stock engines .270 to .295
NHRA Comp style engines .300 to .320(some single carbs some duel carbs)

My 455SD is .280(low compression)
HP = .280 x 8 x 305 = 683HP

Stacy's 428 is .310(13 to one)
HP = .311 x 8 x 305 = 759HP

Turbo engines are built for handling boost, heavy pistons, billet rods, piston below the deck causing severe quench trying to run nomally aspirated. They also have small headers limiting HP without the turbos on so typically peak torque is higher than peak HP. Tony's flow bench is a little off so we use the corrected values per Tom Vaught's awesome flow plates for a correction curve for more accurate results. It is spot on!

HP = .320 x 8 x 400 cfm = 1024HP
HP = .320 x 8 x 470 cfm = 1203HP

Higher cubic inch engines make more power. So we are hoping for a bit more on the 620 eng. We have seen Tony show big numbers, we are up big time. Langer is up big time. Phil Monteith is up big time. Tony gets numbers higher than most. We cant wait to get these engines on the dyno/track.