Racer brown vrs ultradyne

[Don Dulmage <big-d@xxxxxxxxxxxx>]

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Ok you asked I will tell you. First ,more lift in an iron headed engine does not produce more power. , Usually less. . 
What makes you so sure, Don? you ask . (I can hear what your thinking)
Well if you have been to my website you know I told you I tested everything  first so it is not opinion. I have run 23 cams in these motors . 
I bought an untradyne 613 cam  after i had old reliable running strong. Our head flow was in the mid 280 for CFM  at 540 lift. We knew that head flow did not improve above that and in fact would go backwards above those figures  We knew we could port the heads so they would sustain lifts to 600 but they still wouldnt flow as much air as the real good heads did at 540. (Dvorak did a real good "honest" test of all heads in the 90s in Chrysler power magzine and it is one of the best  i have seen Our own tests bore it out exactly )
So still not sure i ordered the 613 cam as it was advertised as the most powerful solid  racing cam currently available for the BB mopar (Muscle motors ad from the early days. )
I replaced the racer brown which was running 11.50s at the time  in a 4150 lb car. (I am not kidding that is fact it weighs that much)
The car immediately slowed down. I ran shift loops at a different track so know one would bother me for two days , tried jettting , tried 1/2 inch fuel line  and bigger pump. Different timing settting , moved the cam etc etc . Could just get the car into the 11s with 11.76 being the best on an extremely good run with awesome hook.  MPH was also down so I took the engine apart to see if all was well. It was. I retested the heads on my flow bench and came again up against the limited lift abilty of the heads. I took another head and ported each intake port different including one  bronzed up and holding a 2.3 inch valve made from a reworked BB chey valve.Still was unalble to get flow above what my heads flowed (I still have this test piece by the  way.)
So i contacted  cam manufacturers and asked for a cam with similar opening and closing durations as the Ultradyne but reduced lift. Lunati was able to supply a cam that had exactly the same specs except it was 520 lift. This will be the perfect test i thought to see if my tests were correct or if i was just dreaming. I installled the cam and immeditaely the car ran 11.51 and the miles per hour returned . The Lunati was an excellant cam but hard on valve springs. It ran exactly to the tenth of a second what the STX 20  racer brown ran and the racer brown was very easy on parts so I eventually reinstalled it. 
Mr Dvorak by the way draws the line at 530 lift while I stretch it to 540 . but even if I am an idiot he is no fool when it comes to these motors. So bottom line is would  a car with a j high lift ultradyne or Hughs cam and ported iron heads run faster with a STX 20 racer brown or the 520 Lunati listed in my book? The answer is YES.  Because the cam more suits the design of the iron cly heads. 
I believe however with after market heads the ultradyne would do the job if the heads support flow above say 615 to 629 lift. 
As for the rocker ratios. I would like so see a controlled test back to back runs  with 1.5s 1.6s and 1.7 on an iron head engine. I suspect the actual results would be "dissappointing" to say the least however me and Wagar are going to try that this summer. to find out for sure because there is nothing like actually testing the stuff. I asked my cam grinders what they thought and they both said "sometimes it works, sometimes it doesnt. There are many factors involved "
We made a set of 1.7s in the seventies and tried them on my 440 dart. there was 0 difference  but times have a changed and i want to try it again. 
Having said all that if you love your cam just enjoy it and dont worry about what i think.. You car is running real strong and that is all that matters. 
My only intent is to help us all go faster with fewer bucks spent.
Don

 
Author of
Return to Deutschland (True Adventure)
Old Reliable (Mopar)
http://stores.ebay.ca/Don-Dulmage-Enterprises
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