Cams for 318's

OK Hyd rollers
Lets assume that careful analysis indicates that a 270 @ .006 duration is optimal
I'm going to pick the lobe- the more radical may not be street, they may take more and more often spring changes


First 3 Ultrdyne lobes
Ultradyne UD Harold Lobes 1.5 rocker
HR5 270 206 111 0.401
HR27 271 217 138 0.516
HR23 272 218 141 0.530

Then 4 bullet lobes
Bullet lobes lobe
HR270/330 270 218 138 .3300 .000 CTS
HR270/313 270 218 132 .3130 .000 CRA
HR270/3175 270 212 130 .3175 .000 CTA
HR270/2775 270 214 119 .2775 .000 CRA

and some Inverse radius lobes- 3 268 lobes to compare with the flat flank 270 lobes if you wanted more Horsepower and then one size shorter seat and two sizes shorter seat
ERH Series
268 222 143 .340 .510
264 218 149 .340 .510
260 211 126 .316 .474


HR series

268 218 136 .325 .487
268 210 126 .312 .469
264 212 128 .310 .465
260 210 132 .313 .469
260 208 128 .327 .490

note how well the .200 can hold up with the shorter seat durations
If you get a custom cam from anyone be sure to get the optimum radicaliness for your use
do not buy from the bottom of the catalog-

UD Harolds comments are from
Mopar stroker cam selection? Please help! - Don Terrill’s Speed-Talk
Mopar stroker cam selection? Please help!

you will notice how the .200 is more useful than .050 for power
but again do not just specify the big number= it may be race only
and seat timing for dynamic compression- low end punch