Race Flo / Race Master & Pro Flo / Severe Duty Valves
- Chrome Stems and Hard Tips
- Intakes are "Pro Flo" for Improved Flow
- Swirl Polished and Machined
- O.E. Style Radius Keeper Grooves
|
 |
| Part No. |
Type |
Head Diameter |
Stem Diameter |
Installed Height |
O/A Length |
Tip Length |
Underhead Angle/Radius |
Margin |
Seat Width |
Top of Head |
Wgt/Grams |
 |
| RACE FLO / RACE MASTER VALVES |
|
| 12359-8 |
Exh. |
1.560 |
.3136 |
Stock |
5.208 |
.160 |
25° x 7/16" |
.065 |
.110 |
18° |
TBA |
|
| 12356-8* |
Int. |
1.930 |
.3133 |
Stock |
5.232 |
.160 |
Pro Flo 12° x 3/8" |
.050 |
.100 |
7° |
TBA |
|
| * Valves 12356 and 12358 have a back cut of .050" x 30° |
|
PRO FLO SEVERE DUTY VALVES / EXTREME DUTY VALVES
- XH-432 XtremeAlloy Material
- Swirl Polished and Machined
- Chrome Stems and Hard Tips
- O.E. Style Radius Keeper Grooves
|
|
| Part No. |
Type |
Head Diameter |
Stem Diameter |
Installed Height |
O/A Length |
Tip Length |
Underhead Angle/Radius |
Margin |
Seat Width |
Top of Head |
Wgt/Grams |
|
| Chevy Small Block 5.3L LS/L83 2014-Up - Severe Duty |
|
| 12361-8 |
Exh. |
1.560 |
.3136 |
Stock |
5.208 |
.160 |
25° x 7/16" |
.065 |
.110 |
18° |
TBA |
|
| 12358-8* |
Int. |
1.930 |
.3133 |
Stock |
5.232 |
.160 |
Pro Flo 12° x 3/8" |
.050 |
.100 |
7° |
TBA |
|
| Chevy Small Block 5.3L LS/L83 2014-Up - Extreme Duty |
|
| 12363-8 |
Exh. |
1.560 |
.3136 |
Stock |
5.208 |
.160 |
25° x 7/16" |
.065 |
.110 |
18° |
TBA |
|
| * Valves 12356 and 12358 have a back cut of .050" x 30° |
|
