This classic thread seems the right place for this question since Jay you noted the Cammer SOHC specs at 4v=616hp, 8v=657hp.
Nobody on fordfe.com seems to know.
See link below with specs.
But also, note that in the original SAE 650497 paper, the specs at the back say
Torq 515 at 3800
Power 616 at 7000
But then lists TWO 4v carbs.
The graphs arenc conclusive either, they do show a peak about 620hp for the 8v in Figure 42, but clearly it's not even near peaking.
Peak 8v torque looks a lot more like 530 vs 575 in the Motor Trend link below.
Any idea of the real factory SOHC ratings & how they were obtained? A-Curve conditions maybe (blueprinted engine, steel tube headers etc?)
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I was searching for a possible 1968 NHRA 427 SOHC entry for SS/A racing.
Came across this cool article from June 2012:
https://www.motortrend.com/how-to/mdmp- ... he-mighty/
"Weighing in at a hefty 680 pounds, the new engine served notice that the competition had something to fear when dynamometer numbers revealed that the single four-barrel version produced 616 hp at 7,000 rpm and 515 lb-ft of torque at 3,800 rpm. And as if it couldn't get any better, the addition of the dual four-barrel carburetors stepped the horsepower up to 657 at 7,500, and torque numbers jumped to a stump-pulling 575 lb-ft at 4,200 rpm. "
Do those specs seem high?
Especially the 60 ftlb Torq gain just by adding dual quads?
Somehow I have down 4v=575hp and 8v=616hp which jives a lot better in the Gonkulator (for a nominal factory rating with iron manifolds) vs eg Jay's SOHC dyno tests.
Anybody have any other specs & sources on SOHC Torq & HP?