CHEVROLET APPLICATION
Competition Series (Small Block V8)

SI Valves

This model features an undercut stem in the head area. In addition to reducing the valve weight (which provides benefits in opening rate and RPM limits) the radius of the head is such that it significantly improves air/fuel flow. This model enjoys great success when used with stock heads, as well as modified versions. Fully swirl-polished Chromed stems and Stellite tips.

Ideal for tough racing applications of all kinds. Now available for imports.

SI Valves

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APPLICATION
TYPE
INSTALL
HEIGHT
HEAD
DIA.
STEM
DIA.
GROOVE
TYPE
BLACK
KNIGHT
PRICE
$EA
PART
NUMBER
PRICE
$EA
SMALL BLOCK
302-350 C.I.D.
EX
STOCK
1.60
STOCK
2G
 
1002 Polished
12.06
350 Corvette 88-on
EX
STOCK
1.50
STOCK
1G
 
1007 No Polish
12.07
265-400 C.I.D.
EX
100
1.50
STOCK
1G
 
1007SG No Polish
13.62
265-400 C.I.D. ±
IN
STOCK
1.72
STOCK
2G
1051BK
11.28
1051 No Polish
11.39
265-400 C.I.D. ±
IN
STOCK
1.72
STOCK
1G
1051SGB
12.32
1051SG No Polish
10.77
327-400 C.I.D. ±
IN
STOCK
1.94
STOCK
2G
1052BK
11.59
1052 No Polish
11.59
327-400 C.I.D. ±
IN
STOCK
1.94
STOCK
1G
1052SGB
Call
1052SG No Polish
11.59
327-400 C.I.D.
IN
STOCK
2.02
STOCK
2G
 
1053 Polished
12.34
350 Corvette 88-on
IN
STOCK
1.94
STOCK
2G
 
1058 No Polish
10.77
350-400 C.I.D.
IN
100
1.94
STOCK
1G
1058SGB
Call
1058SG No Polish
11.45
265-400 C.I.D.
IN
100
1.72
STOCK
1G
 
1059SG No Polish
13.00
265-400 C.I.D.
EX
STOCK
1.57
STOCK
1G
 
1263SG Polished
13.00
265-400 C.I.D.
IN
STOCK
2.00
STOCK
1G
 
1264SG Polished
13.00
265-400 C.I.D.
EX
150
1.620
0.3445
1G
 
1266SG
13.18
265-400 C.I.D.
EX
150
1.625
0.3445
1G
 
1267SG
13.18
265-400 C.I.D.
IN
150
1.94
0.3445
1G
 
1268SG
13.08
265-400 C.I.D.
IN
150
2.02
0.3445
1G
 
1269SG
13.18
265-400 C.I.D.
IN
150
2.055
0.3445
1G
 
1270SG
13.18
265-400 C.I.D.
IN
150
2.08
0.3445
1G
 
1271SG
13.18
265-400 C.I.D.
IN
150
2.10
0.3445
1G
 
1272SG
13.18
265-400 C.I.D.
IN
150
2.125
0.3445
1G
 
1273SG
13.17
265-400 C.I.D.
IN
300
2.055
0.3415
1G
 
1265SG+300
13.87
265-400 C.I.D.
EX
STOCK
1.50
0.3415
2G
1201BK
12.09
1201E
11.45
265-400 C.I.D.
EX
STOCK
1.500T
0.3415
1G
Tulip 23°
Call
1301SGS
12.21
265-400 C.I.D.
EX
100
1.500T
0.3415
1G
Tulip 23°
Call
1304SGS
12.32
265-400 C.I.D.
EX
STOCK
1.60
0.3415
1G
1202SGB
15.35
1202SG
12.03
265-400 C.I.D.
EX
STOCK
1.625
0.3415
1G
1203SGB
Call
1203SG
11.53
265-400 C.I.D.
EX
50
1.625
0.3415
1G
 
1203SG+50
13.62
265-400 C.I.D.
EX
STOCK
1.65
0.3415
1G
 
1204SG-S
12.85
265-400 C.I.D.
EX
STOCK
1.687
0.3415
1G
1204SGB
15.47
1204SG
12.32
265-400 C.I.D.
EX
100
1.687
0.3415
1G
 
1204SG+100
15.47
265-400 C.I.D.
EX
100
1.65
0.3415
1G
 
1204SG-S+100
13.62
265-400 C.I.D.
EX
0.1
1.60
0.3415
1G
1210SGB
Call
1210SG
12.32
265-400 C.I.D.
EX
0.2
1.60
0.3415
1G
1214SGB
14.91
1214SG
12.32
265-400 C.I.D.
EX
STOCK
1.600F
0.3415
1G
 
1215SG
11.63
265-400 C.I.D.
EX
STOCK
1.600T
0.3415
1G
1301SGB
15.48
1301SG
12.38
265-400 C.I.D.
EX
STOCK
1.625T
0.3415
1G
1302SGB
15.48
1302SG
13.18
265-400 C.I.D.
EX
STOCK
1.625T
0.3415
1G
1303SGB
15.48
1303SG
13.18
265-400 C.I.D.
EX
0.1
1.600T
0.3415
1G
1304SGB
13.93
1304SG
13.18
265-400 C.I.D.
EX
0.1
1.625T
0.3415
1G
1305SGB
15.48
1305SG
13.18
265-400 C.I.D.
EX
0.1
1.687
0.3415
1G
 
1204SG+100
15.47
265-400 C.I.D.
EX
STOCK
1.600TF
0.3415
1G
1306SGB
Call
1306SG
12.32
265-400 C.I.D.
IN
STOCK
1.94
0.3415
1G
1251BK
12.09
1251SG
12.01
265-400 C.I.D.
IN
200
1.94
0.3415
1G
 
1251SG+200
12.23
265-400 C.I.D.
IN
STOCK
2.02
0.3415
1G
1252SGB
15.48
1252SG
12.34
265-400 C.I.D.
IN
200
2.02
0.3415
1G
 
1252SG+200
12.34
265-400 C.I.D.
IN
STOCK
2.020F
0.3415
1G
 
1252SGF
12.34
265-400 C.I.D.
IN
STOCK
2.055
0.3415
1G
1253SGB
Call
1253SG
12.32
265-400 C.I.D.
IN
STOCK
2.055
0.3415
1G
1351SGB
16.48
1351SG
11.63
265-400 C.I.D.
IN
0.1
2.055
0.3415
1G
1356SGB
16.69
1356SG
12.32
265-400 C.I.D.
IN
200
2.055
0.3415
1G
 
1351SG+200
12.32
265-400 C.I.D.
IN
50
2.055
0.3415
1G
 
1265SG
12.32
265-400 C.I.D.
IN
STOCK
2.08
0.3415
1G
1352SGB
13.76
1352SG
11.63
265-400 C.I.D.
IN
50
2.08
0.3415
1G
 
1352SG+50
11.55
265-400 C.I.D.
IN
0.1
2.08
0.3415
1G
1353SGB
16.74
1353SG
11.55
265-400 C.I.D.
IN
0.2
2.08
0.3415
1G
1354SGB
13.78
1354SG
12.38
265-400 C.I.D.
IN
0.1
2.10
0.3415
1G
1355SGB
Call
1355SG
13.18
265-400 C.I.D.
IN
STOCK
2.15
0.3415
1G
 
4002SGS
13.18
265-400 C.I.D.
IN
100
2.15
0.3415
1G
 
4002SGS+100
13.18
265-400 C.I.D.
IN
100
2.20
0.3415
1G
 
1355SGS
13.87
5/16" STEM - These valves have a 5/16 stem for those who want a light valve without going to titanium. All valves are swirl polished with hard tips and chrome stems.
265-400 C.I.D.
EX
STOCK
1.6
0.3085
1G
 
1501SG
15.35
265-400 C.I.D.
EX
0.1
1.6
0.3085
1G
 
1502SG
15.35
265-400 C.I.D.
EX
0.1
1.625
0.3085
1G
 
1503SG
15.35
265-400 C.I.D.
EX
STOCK
1.625
0.3085
1G
 
1504SG
15.35
265-400 C.I.D.
EX
STOCK
1.600T
0.3085
1G
 
1505SG
15.35
265-400 C.I.D.
IN
0.1
2.02
0.3085
1G
 
1551SG
15.48
265-400 C.I.D.
IN
0.1
2.055
0.3085
1G
 
1552SG
15.48
265-400 C.I.D.
IN
STOCK
2.055
0.3085
1G
 
1553SG
15.48
265-400 C.I.D.
IN
0.1
2.125
0.3085
1G
 
1554SG
15.48
265-400 C.I.D.
IN
STOCK
2.02
0.3085
1G
 
1558SG
15.48
UNDERCUT- These valves have undercut stems for improved flow with stock heads or slightly ported heads. Recommended for modified engines. For street and strip. All valves are swirl polished with hard tips.
265-400 C.I.D.
EX
STOCK
1.625
0.3415
1G
 
1400SG
12.21
265-400 C.I.D.
EX
STOCK
1.6
0.3415
1G
 
1401SG
10.52
265-400 C.I.D.
EX
50
1.6
0.3415
1G
 
1401SG+50