[Steve C.]

Here are numbers from a early Old Faithful cam as reported directly from a cam card:

Grind number P8 3122B / 3120B HR112.0
Rated 289 / 306 at .006" tappet lift
236 / 245 at .050"
112 LS / 108 ICL
Lobe lift .3800" and .3830"

Note the lobe numbers have the "B' suffix code.
Note the .006" numbers, 289 & 306, are slightly different than stated in the Comp Cams lobe section, 290 & 304

Roller cam lobe suffix codes

If ordered with a "B" suffix code after the lobe number the specs can be, but not always, slightly different.
Example, If you look at Dave Bisschop's custom grinds they are typically ordered with that code, and
it doesn't matter if it's a Magnum Hyd lobe or a Xtreme Energy hyd lobe.

And another thing to understand often the duration numbers that show up on the cam card are ever so slightly different than what the catalog lobes show, as the Pontiac cams are typically ground on a slightly different base circle than the sbc/bbc typically use, and that can result in minor changes.


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