CAM LOBE PROFILE CATALOG - Crane Cams Australia

MECHANICAL ROLLER PROFILES
PROFILE CODE
DUR. AT .050”/
LOBE LIFT
ADVERTISED DUR.
AT TAPPET LIFT
DEG. IN.
DUR. AT
.200”
TAPPET LIFT
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
Continued on next page.
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DESIGN
LOBE SIZE
CODE
1.50 1.60 1.70 1.76 SEE PAGE 3
R2 Continued from previous page.
R-296/4778 328 .0225 209 .200 .161 .717 .764 .812 .841 B C
R-300/4778 332 .0225 213 .207 .167 .717 .764 .812 .841 G
R-300/5098 332 .0225 215 .213 .173 .765 .816 .867 .897 C
4706
4706 roller series created for drag racing applications for engines like the big block Chevrolet and
Chrysler engines, where stable exhaust valve motion is required. Recommended lash is .030”.
R-280/4706 320 .0198 192 .165 .126 .706 .753 .800 .828 C
R-282/4706 322 .0198 194 .169 .129 .706 .753 .800 .828 C
R-284/4706 324 .0198 196 .173 .133 .706 .753 .800 .828 C
R-286/4706 326 .0198 198 .178 .137 .706 .753 .800 .828 C
R-288/4706 328 .0198 200 .182 .141 .706 .753 .800 .828 C
R-290/4706 330 .0198 202 .186 .145 .706 .753 .800 .828 C
R-292/4706 332 .0198 204 .190 .149 .706 .753 .800 .828 C
R-294/4706 334 .0198 206 .195 .153 .706 .753 .800 .828 C
R-296/4706 336 .0198 208 .199 .157 .706 .753 .800 .828 C
R-300/4706 340 .0198 212 .205 .163 .706 .753 .800 .828 C E
R-302/4706 342 .0198 214 .212 .169 .706 .753 .800 .828 E
R-304/4706 344 .0198 217 .218 .175 .706 .753 .800 .828 C E
R-308/4706 348 .0198 219 .224 .182 .706 .753 .800 .828 C E
R-310/4706 350 .0198 221 .228 .186 .706 .753 .800 .828 C E
R-312/4706 352 .0198 223 .232 .190 .706 .753 .800 .828 E
R-314/4706 354 .0198 225 .236 .194 .706 .753 .800 .828 C E
R-316/4706 356 .0198 227 .240 .198 .706 .753 .800 .828 E
R-318/4706 358 .0198 229 .245 .203 .706 .753 .800 .828 C E
R-320/4706 360 .0198 231 .249 .207 .706 .753 .800 .828 E F
R-322/4706 362 .0198 233 .252 .211 .706 .753 .800 .828 C E F
R-326/4706 366 .0198 237 .257 .215 .706 .753 .800 .828 C
490
490 roller series created for drag racing applications for engines like the big
block Chevrolet and Chrysler engines, where stable exhaust valve motion is
required. Recommended lash is .026" intake and .030" exhaust.
R-292/490 328 .0200 210 .204 .160 .735 .784 .833 .862 C
R-302/490 338 .0200 219 .224 .180 .735 .784 .833 .862 C
R-306/490 342 .0200 223 .232 .189 .735 .784 .833 .862 C
R-312/490 348 .0200 228 .244 .201 .735 .784 .833 .862 C
NOPOP2
NOPOP2 roller series created for various drag race applications where stable
high RPM valve motion is required. Recommended lash is .026”.
R-264/4334 304 .0162 176 .132 .103 .650 .693 .737 .763 C
R-268/4834 308 .0162 180 .139 .109 .725 .773 .822 .851 C
R-274/4334 314 .0162 197 .176 .130 .650 .693 .737 .763 C
R-278/413 318 .0162 187 .157 .125 .620 .661 .702 .727 B C
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