BBC mark and genV solid roller
 

Cams ,Crane part # R 258-420 specs are

420 Series created for oval track racing applications including sprint
cars. A .020" recommended lash allows for a tight cold setting on
aluminum engines.
Profile Advertised Dur. At Tappet Lift Gross Valve Lift Min. Tappet
Type Duration .200” At TDC With Zero Lash Dia./Design
Duration At At Tappet Tappet 104° 114° With Theoretical Lobe Size Code
.050” Lift Deg. In. Lift Int. Exh. Rocker
Ratio
1.5 1.6 1.7 1.76
R-244/420 276 .0200 166 .105 .070 .630 .672 .714 .739 B
R-246/420 278 .0200 169 .109 .073 .630 .672 .714 .739 B
R-248/420 280 .0200 169 .113 .081 .630 .672 .714 .739 A B
R-252/420 284 .0200 173 .121 .087 .630 .672 .714 .739 A B
R-256/420 288 .0200 176 .129 .094 .630 .672 .714 .739 A B
R-258/420 290 .0200 178 .133 .098 .630 .672 .714 .739 B
R-260/420 292 .0200 180 .137 .101 .630 .672 .714 .739 A B
R-262/420 294 .0200 182 .141 .105 .630 .672 .714 .739 B G
R-264/420 296 .0200 183 .145 .109 .630 .672 .714 .739 A B G
R-266/420 298 .0200 185 .150 .113 .630 .672 .714 .739 B
R-268/420 300 .0200 187 .154 .116 .630 .672 .714 .739 A B F
R-270/420 302 .0200 189 .158 .120 .630 .672 .714 .739 B
R-272/420 304 .0200 191 .162 .124 .630 .672 .714 .739 A B
R-274/420 306 .0200 193 .166 .128 .630 .672 .714 .739 B
R-276/420 308 .0200 195 .170 .132 .630 .672 .714 .739 A B
R-278/420 310 .0200 196 .174 .136 .630 .672 .714 .739 B
R-280/420 312 .0200 198 .178 .140 .630 .672 .714 .739 B
R-282/420 314 .0200 200 .182 .145 .630 .672 .714 .739 B
R-284/420 316 .0200 202 .186 .147 .630 .672 .714 .739 B
R-286/420 318 .0200 202 .190 .149 .630 .672 .714 .739 B
R-290/420 322 .0200 203 .198 .154 .630 .672 .714 .739 B






$75.00 each + the ride