paul_huryk Mar 31 2006 - 4:42pm
In another section,I explained how cams work,powerbands based on duration and how important vavle lift is.There are two other areas of camshaft specs you need to know before you buy:Lobe Seperation and hoe to figure out the duration you need in engines larger or smaller than 350ci. Lobe seperation is the amount of degrees between the intake and exhaust lobes of a camshaft.Knowing about the seperation is important because it directly affects midrange (and low end to a degree) torque,it also affects how much vacuum a motor will pull at idle(more vacuum means a better idling-less racy motor).Most stock cams from chevy motors have a seperation of between 114 and 118 degrees,these cams are not optimized for power,but for economy.If you make the centerline 112 degrees,the motor will idle and make more midrange torque than a stock cam with the same durations and lift.If you want even more midrange,you can use a cam with 108 degrees seperation,but it will idle like shit,and the computer will think something is wrong because the vacuum is low.Most street cars work extremely well with a cam of 112 degrees seperation.One word about seperation and supercharging:superchargers like cams with 115 or more degrees of seperation.Why?Because you use the supercharger to force more air in than it can without,having a small seperation makes the boost go in the intake vavle and straight out the exhaust(because it is open longer into the intake stroke). The way to calculate the duration needed on a smaller or larger motor is easy;for every 25 cubic inches above a 350,add 5 degrees of duration to make power at the same peak as a 350.If the motor is smaller than a 350,subtract 5 degrees of duration for every 25 cubic inches the motor is smaller than a 350.
This is a list of every replacement roller cam for small block chevys (factory roller).
| Competition Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 08-300-8 |
206/210 |
.450/.480 |
.480/.512 |
112deg |
None |
| 08-302-8 |
210/220 |
.480/.480 |
.512/.512 |
112deg |
None |
| 08-304-8 |
210/220 |
.500/.510 |
.533/.544 |
112deg |
None |
| 08-306-8 |
230/244 |
.510/.540 |
.544/.576 |
112deg |
None |
| Crane Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 104101 |
184/194 |
.384/.407 |
.410/.434 |
106deg |
None |
| 104104 |
184/204 |
.384/.429 |
.410/.458 |
108deg |
None |
| 104111 |
194/204 |
.407/.429 |
.434/.458 |
111deg |
None |
| 104121 |
204/214 |
.429/.452 |
.458/.482 |
116deg |
None |
| 104125 |
208/214 |
.438/.452 |
.467/.482 |
112deg |
None |
| 104124 |
214/220 |
.452/.456 |
.482/.486 |
112deg |
None |
| JVR4 |
210/224 |
.516/.516 |
.551/.551 |
112deg |
None |
| 10HR00022 |
206/214 |
.497/.497 |
.530/.530 |
112deg |
None |
| Lunati Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 50160 |
213/218 |
.446/.468 |
.476/.499 |
110deg |
None |
| 50155 |
215/218 |
.489/.503 |
.521/.536 |
113deg |
None |
| 50156 |
232/242 |
.510/.525 |
.544/.560 |
108deg |
None |
| 50162 |
242/252 |
.525/.540 |
.560/.576 |
108deg |
None |
| SLP Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 51002 |
206/214 |
.470/.490 |
.501/.522 |
112deg |
None |
| 51006 |
214/224 |
.470/.490 |
.501/.522 |
115deg |
1992 Firehawk OE |
| 51010 |
224/232 |
.490/.510 |
.522/.544 |
112deg |
None |
| Accel/Lingenfelter Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 74211 |
211/219 |
.503/.525 |
.536/.560 |
112deg |
None |
| 74216 |
216/218 |
.462/.470 |
.493/.501 |
112deg |
None |
| 74219 |
219/219 |
.525/.525 |
.560/.560 |
112deg |
None |
| TPIS Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 700-136 |
212/226 |
.483/.520 |
.515/.554 |
112deg |
ZZ9 Cam |
| 700-137 |
210/218 |
.492/.492 |
.525/.525 |
112deg |
None |
| 700-150 |
218/219 |
.415/.433 |
.443/.462 |
108deg |
Super Profile L98 |
| GM High-Performance Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 10134334 |
235/235 |
.480/.480 |
.512/.512 |
114deg |
ZZ1 motor cam |
| 10185071 |
208/221 |
.474/.510 |
.510/.544 |
112deg |
ZZ3 motor cam |
| 24502586 |
218/228 |
.492/.492 |
.525/.525 |
112deg |
LT4 motor cam |
| GM Stock Cams |
| Model Number |
.05" Duration |
1.5:1 Lift |
1.6:1 Lift |
Lobe Sep. |
Notes |
| 14093643 |
202/207 |
.404/.415 |
.431/.443 |
114.5 |
87 350,305man |
| 10088155 |
179/194 |
.350/.384 |
.373/.410 |
109deg |
87 305 auto |
| 10066049 |
207/213 |
.415/.430 |
.443/.459 |
117deg |
88-89 350,305 |
| 10111773 |
202/207 |
.413/.428 |
.441/.457 |
114.5 |
90-92 350,305 |
