Some info about cams and grind patterns...
Delta Cams in Tacoma WA has several different 235/261 cam grinds to choose from.
Patrick's and Langdon's cams are from Delta.
Delta will regrind your existing cam to any spec for $50.
Very good phone customer service.
They recommend 254 duration max. for 3500 rpm and less, either 235 or 261.
The same cam in a 235 will move the power band a few hundred rpm higher compared to the 261.
McGurk's road and 3/4 race cam grinds always had longer duration for exhaust with shorter duration for intake.
They were all great at high rpm, but even the milder grinds lacked power at the lower rpm range.
Delta offers a similar but less extreme asymmetrical grind pattern with their popular 'Bulldog' grind giving much better low end torque.
Their cam grinds have different valve event timing with less overlap than stock and early performance cams.
These guys have ground cams for decades and really know how to get the best performance from these engines.
Cam grind depends on the rpm range the motor is supposed to give most power.
For mostly city driving and hauling, the stock cam grind will give highest torque.
For frequent freeway trips, a mid-range cam gives better performance.
Race cams get maximum hp starting at 4000 rpm.
The 261 link in my signature has some graphs I made showing the dyno results of the famous McGurk Article in Hot Rod magazine 1955.
