PERFORMANCE NITRO BLACK VALVES
21-4N high strength stainless alloy
Swirl polished for improved flow characteristics
Fully undercut stem
Hard wafer tip
NITRO
One piece forging
B L A C K
NITRIDED HIGH PERFORMANCE VALVES
Proprietary liquid nitriding process that creates a valve that is smoother,
stronger and more corrosion resistant than traditional chromed valves
Deep nitriding provides better ductility under the hard nitrided layer as
proven in rotating-bending fatigue tests
Valve is less likely to break even if contacted by the piston
Greater surface hardness means less valve guide wear
Improved corrosion resistance even with exotic fuels
Our nitriding process is much cleaner than chroming- it's better for the environment
HEAD
STEM
INSTALLED
OVERALL
TIP
PART #
TYPE
DIAMETER
DIAMETER
HEIGHT
LENGTH
LENGTH
ENGINE PRO'S
CHEVROLET SMALL BLOCK
Nitro Black racing
01-3000-8
EXH
1.500
11/32"
STOCK
4.910
.250*
valves are smoother
01-3001-8
EXH
1.600
11/32"
STOCK
4.910
.250
than chrome.
01-3001.100-8
EXH
1.600
11/32"
+100
5.010
.250
01-3002-8
INT
1.940
11/32"
STOCK
4.910
.250*
01-3003-8
INT
2.020
11/32"
STOCK
4.910
.250
01-3003.100-8
INT
2.020
11/32"
+100
5.010
.250
01-3007.100-8
INT
2.055
11/32"
+100
5.010
.250
01-3008.100-8
INT
2.080
11/32"
+100
5.010
.250
* NO UNDERCUT
CHEVROLET BIG BLOCK
01-3004-8
EXH
1.880
3/8"
STOCK
5.352
.250
01-3014.100-8
EXH
1.880
11/32"
+100
5.452
.250
01-3014.150-8
EXH
1.880
11/32"
+150
5.502
.250
01-3015.100-8
EXH
1.880
11/32"
+100
5.452
.250*
01-3005-8
INT
2.190
3/8"
STOCK
5.228
.250
01-3012.250-8
INT
2.250
11/32"
+250
5.478
.250
01-3013.250-8
INT
2.300
11/32"
+250
5.478
.250
01-3013.300-8
INT
2.300
11/32"
+300
5.525
.250
* 20 NO UNDERCUT
CHEVROLET LS1-- BEAD LOCK
01-3200-8
EXH
1.570
0.313"
STK
4.890
.160
01-3201-8
EXH
1.600
0.313"
STK
4.890
.160
01-3202-8
INT
2.020
0.314"
STK
4.880
.160
01-3206-8
INT
2.041
0.314"
STK
4.880
.160
01-3207-8
INT
2.055
0.314"
STK
4.880
.160
Scanning Electron Microscope Comparison
Laboratory tests prove that NITRO BLACK nitrided performance
valves are more than 21% smoother than traditional
chrome plated valves. Scanning electron microscope images
125X
125X
back that up.
Nitro Black
chrome
Smoother valve stems mean less valve and valve guide friction.
Surface Texture Tests (Roughness measurement)
Nitro Black Rp: .................38.5 micro inches
Less friction means more power, less wear and less chance
Chrome Rp:.......................48.8 micro inches
of breakage.
NEW NUMBERS SHOWN IN BOLD FACE TYPE
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