| Chev SB |
|
| Intake |
Size, Stem, Length |
| 19401 |
1.940 (int), 11/32”, Stock |
| 19411 |
.940 (int), 11/32”, +.100” |
| 20201 |
2.020 (int), 11/32”, Stock |
| 20211 |
2.020 (int), 11/32”, +.100” |
| 20501 |
2.055 (int), 11/32”, Stock |
| 20511 |
2.055 (int), 11/32”, +.100” |
| 20801 |
2.080 (int), 11/32”, Stock |
| 20811 |
2.080 (int), 11/32”, +.100” |
| 21001 |
2.100 (int), 11/32”, Stock |
| 21011 |
2.100 (int), 11/32”, +.100” |
| Exhaust |
Size, Stem, Length |
| 15001 |
1.500 (exh), 11/32”, Stock |
| 15011 |
1.500 (exh), 11/32”, +.100” |
| 16001 |
1.600 (exh), 11/32”, Stock |
| 16011 |
1.600 (exh), 11/32”, +.100” |
| 16201 |
1.625 (exh), 11/32”, Stock |
| 16211 |
1.625 (exh), 11/32”, +.100” |
| Chev BB |
|
| Intake |
Size, Stem, Length |
| 20603 |
2.065 (int), 3/8”, Stock |
| 21911 |
2.190 (int), 11/32”, +.100” |
| 21903 |
2.190 (int), 3/8”, Stock |
| 21913 |
2.190 (int), 3/8”, +.100” |
| 22511 |
2.250 (int), 11/32”, +.100” |
| 22513 |
2.250 (int), 3/8”, +.100” |
| 23011 |
2.300 (int), 11/32”, +.100” |
| 23012 |
2.300 (int), 11/32”, +.250” |
| 23003 |
2.300 (int), 3/8”, Stock |
| 23013 |
2.300 (int), 3/8”, +.100” |
| Exhaust |
Size, Stem, Length |
| 17203 |
1.720 (exh), 3/8”, Stock |
| 18811 |
1.880 (exh), 11/32”, +.100” |
| 18803 |
1.880 (exh), 3/8”, Stock |
| 18813 |
1.880 (exh), 3/8”, +.100” |
| 19011 |
1.900 (exh), 11/32”, Stock |
|
These one-piece stainless steel valves were developed for applications requiring excellent reliability in a race environment. Ideal for both oval track and drag racing with big lifts and high spring pressures. Fully machined 21-4N material. Hardened tips and hard chrome stems. Undercut stems. Sold as each.
Engineered for high rpm and high horsepower applications. Extreme Black™ feature a gloss black nitride and are perfect for high temperatures (they run cooler which improves valve life), nitrous, turbo and supercharger applications. For naturally aspirated motors these valves will give you a much greater cylinder flow for good horsepower gains. They start as a one piece forged, high temperature, high nickel, stainless steel alloy. CNC finished to strict tolerances making these valves the choice for the most demanding race classes. The black nitride micro-hardness is higher than the stainless steel base material. No process can match it for surface hardness. Surface finish is smoother than with chromed stems, having less friction between stem and guide. The black nitride reduces power loss due to less valve-guide friction. Nitriding is not a coating, it is a process where it actually becomes part of the steel. Sold as each.
