GM Factory
L83                                  193 / 199      .502 / .493          115          5.7mm
L86/LT1                           200 / 207      .551 / .524          116          5.7mm
LT4                                  189 / 223      .502 / .561          120          6.0mm
LT5                                  189 / 223      .502 / .561          120          ?? mm      *Non-AFM

Comp Cams VVT Series 
624-500-13                      210 / 222      .572 / .529          115
624-512-13                      214 / 226      .572 / .529          116
624-524-13                      218 / 230      .572 / .529          117
624-536-13                      222 / 234      .572 / .529          118

Texas Speed
25-LT1216228                 216 / 228       .572 / .529          116

Lingenfelter
GT30                               217 / 229       .576 / .576          116

21968 - Comp Cams 38% fuel lobe 7.85mm

6L80 gearing
(1) 4.0267  (2) 2.3635  (3) 1.5319  (4) 1.1522  (5) 0.8521  (6) 0.6667