The stock 261 cam has a lift nearly identical to the 56-62 235 cam of .404 (some books have it as .405). There are slight differences in the duration and ramps (hydraulic vs solid applications) but in all a pretty mild cam. Power and torque begins at about 1700/1800 and runs up through 3800 or so. If you want a basic truck cam, no fuss or muss, that is the baby.

Tom Langdon's cam is similar in specification to the cams offered by Clifford, Isky, Howards from back in the day. Clifford's cam was .444 lift 264 degree duration and was advertised as a high torque cam with a smooth idle that started its curve just a speck higher at 2000 rpm and made power through 4000 rpm. So not overly aggressive by any means. Langdon's cam, which Tom Lowe at 12bolt.com now sells, is similar at .435 lift.

On a 235, the motor will see that cam as a larger cam, the 261 smaller. Tom used that grind because it was not over aggressive, sounded good, and did not require clearance the pistons. Install it and go.

For comparison, what does an aggressive street cam for a 261 look like, well in one of my 261 motors I have a schneider cam that is .492 lift and 284 duration.

Mike