CAM LOBE PROFILE CATALOG - Crane Cams Australia

PROFILE CODE
DUR. AT .050”/
LOBE LIFT
ADVERTISED DUR.
AT TAPPET LIFT
DEG. IN.
38 cranecams.com | 866.388.5120
DUR. AT
.200”
TAPPET LIFT
MECHANICAL ROLLER PROFILES
MECHANICAL ROLLER PROFILES
TAPPET LIFT AT
TOP DEAD CENTER
104 DEG.
INTAKE
114 DEG.
EXHAUST
GROSS VALVE LIFT WITH ZERO LASH AT
THEORETICAL ROCKER RATIO SHOWN
DESIGN
LOBE SIZE
CODE
1.50 1.60 1.70 1.76 SEE PAGE 3
LH3 Continued from previous page.
R-304/520 304 .0200 220 .231 .183 .780 .832 .884 .915 F
R-308/520 342 .0200 224 .240 .192 .780 .832 .884 .915 F
R-310/520 344 .0200 226 .244 .196 .780 .832 .884 .915 F
R-312/500 347 .0200 222 .232 .187 .750 .800 .850 .880 E F
R-312/520 346 .0200 230 .250 .202 .780 .832 .884 .915 F G
R-318/5001 352 .0200 227 .241 .197 .750 .800 .850 .880 E F
LH4
LH4 roller series, a collection of low harmonic lobes used in large cubic inch engines that are
slightly more aggressive than the LH3. Recommended lash is .020" intake and .022" exhaust.
R-255/5002 285 .0200 174 .125 .089 .750 .800 .850 .880 G K
R-258/5002 288 .0200 177 .130 .094 .750 .800 .850 .880 K
R-266/5002 296 .0200 185 .147 .108 .750 .800 .850 .880 G
R-270/5002 300 .0200 189 .156 .115 .750 .800 .850 .880 F K
R-272/4171 304 .0200 185 .151 .113 .626 .667 .709 .734 C
R-272/5002 302 .0200 191 .160 .119 .750 .800 .850 .880 F
R-274/5002 304 .0200 193 .164 .123 .750 .800 .850 .880 F
R-276/5002 306 .0200 195 .169 .126 .750 .800 .850 .880 B F
R-276/5201 306 .0200 195 .169 .126 .780 .832 .884 .915 G
R-278/4201 310 .0200 191 .163 .124 .630 .672 .714 .736 C
R-278/5002 308 .0200 197 .173 .130 .750 .800 .850 .880 F
R-278/5402 308 .0200 200 .179 .138 .810 .864 .918 .951 G
R-280/4401 312 .0200 193 .167 .128 .660 .704 .748 .774 C F
R-280/5002 310 .0200 198 .178 .134 .750 .800 .850 .880 F K
R-282/4201 314 .0200 194 .172 .132 .630 .672 .714 .736 C
R-282/5002 312 .0200 201 .182 .138 .750 .800 .850 .880 F
R-282/530 312 .0200 201 .182 .138 .795 .848 .901 .933 E
R-284/5002 314 .0200 202 .187 .143 .750 .800 .850 .880 F
R-284/5153 314 .0200 203 .187 .143 .773 .824 .876 .906 F
R-286/5002 316 .0200 205 .192 .147 .750 .800 .850 .880 F
R-286/5152 316 .0200 205 .192 .147 .773 .824 .876 .906 F
R-288/5002 318 .0200 206 .197 .151 .750 .800 .850 .880 F
R-288/5152 318 .0200 206 .197 .151 .773 .824 .876 .906 E F G
R-290/5002 320 .0200 208 .202 .155 .750 .800 .850 .880 F G
R-290/5152 320 .0200 208 .202 .155 .773 .824 .876 .906 F
R-292/5002 322 .0200 210 .207 .160 .750 .800 .850 .880 F
R-292/5152 322 .0200 210 .207 .160 .773 .824 .876 .906 F
R-294/5002 326 .0200 207 .198 .155 .750 .800 .850 .880 F
R-294/5152 324 .0200 212 .211 .164 .773 .824 .876 .906 E
R-294/525 324 .0200 212 .212 .164 .788 .840 .893 .924 E
R-296/5151 327 .0200 212 .209 .164 .773 .824 .876 .906 E
R-298/5002 330 .0200 211 .207 .163 .750 .800 .850 .880 F
Continued on next page.