Quote:
Originally Posted by blykins
Well, maybe.... 
A Roush 427R is basically a Dart block, aluminum heads that flow somewhere around 300 cfm, a hydraulic roller cam, a Victor Jr. intake, and a carb. ---, Roush rates their 427R at 550 hp.
Logically speaking, the displacement is the same, but factory FE head/intake parts are not on the same platform as modern SBF parts, and that's where the difference lies.
Not saying you're wrong, but I think there's a discrepancy somewhere that is being left out. No way a factory 427 will beat a new Roush 427 R (or any 427 Windsor by any manufacturer) by 30-50 hp. |
Well, a factory 1964 FE crate motor did beat out a modern roush crate 427R, so I guess you are wrong.
Long before Roush and you were building crate motors, Ford was, and around 1964-65 Ford offered a crate 427 Hi-Riser , dual plane, single four barrel I believe rated at 485hp. Don't forget, NASCAR banned Hi-Riser heads from racing. I built my engine to replicate this crate motor.
I built my motor to replicate this engine, with an original intake from 1964, original Holley carb that came on that motor, and original pattern aluminum 1964 Hi-Riser heads from Dove. 1968 427 service block bored 0.017" over, cast crank. Actually, I believe there was literature from Shelby that you could have gotten this motor as an option for your 427 cobra, although I'm not sure how many, if any did, although I know a couple cobra's came from Shelby with Hi-Riser heads.
So, my 1964'ish Ford crate 427 did out perform a modern Roush 427R motor. I guess the Ford engineers back then knew a little?