2026 KPMI Full Catalog V1 - Flipbook - Page 358
SEATS (POWDERED METAL)
TOOLS & COMPONENTS
In an e昀昀ort to develop valve seats that 昀椀t our exacting standards, Kibblewhite® tested and chemically separated
several iron based valve seats. We speci昀椀ed a combination of materials that gave us a seat with good uniform
hardness and resistance to microwelding, wear, and recession. Casting a seat with this combination of alloys
was not possible, and only with the latest in Powdered Metal Technology were we able to blend t hese alloys
creating a high density seat with exceptional wear resistance, machinability, and thermal qualities. This material
is compatible with all types of fuel blends, resists corrosion and burning, and is machinable with standard tooling.
These seats have been thoroughly tested on the track and street, in high RPM multi-valve applications, high spring
load V-twin applications, with leaded and unleaded gasoline, ethanol, methanol, and in naturally aspirated and
forced induction applications. In each case they have performed 昀氀awlessly, making these the seats of choice for
cylinder head builders everywhere.
340
KPMI Part Number
10-SC250
10-SC260
10-SC270
10-SC280
10-SC290
10-SC300
10-SC310
10-SC320
10-SC330
10-SC340
10-SC350
10-SC360
10-SC370
10-SC380
10-SC390
10-SC400
10-SC410
10-SC414
10-SC420
10-SC430
10-SC440
10-SC446
10-SC446S
10-SC450
10-SC460
10-SC462
10-SC470
10-SC478
10-SC490
10-SC494
10-SC500
10-SC510
10-SC523
10-SC525
10-SC541
10-SC550
10-SC557
10-SC573
order 650-557-2046
Outside Diameter
Inside Diameter
Height
25.00mm
0.984”
17.00mm
0.669”
9.00mm
0.355”
26.00mm
1.024”
18.00mm
0.709”
9.00mm
0.355”
27.00mm
1.063”
19.00mm
0.748”
9.00mm
0.355”
28.00mm
1.102”
20.00mm
0.787”
9.00mm
0.355”
29.00mm
1.142”
21.00mm
0.827”
9.50mm
0.375”
30.00mm
1.181”
22.00mm
0.866”
9.50mm
0.375”
31.00mm
1.220”
23.00mm
0.906”
9.50mm
0.375”
32.00mm
1.260”
24.00mm
0.945”
9.50mm
0.375”
33.00mm
1.299”
25.00mm
0.984”
9.50mm
0.375”
34.00mm
1.339”
26.00mm
1.024”
9.50mm
0.375”
35.00mm
1.378”
26.00mm
1.024”
11.00mm
0.434”
36.00mm
1.417”
27.00mm
1.063”
11.00mm
0.434”
37.00mm
1.457”
28.00mm
1.102”
11.00mm
0.434”
38.00mm
1.496”
29.00mm
1.142”
11.00mm
0.434”
39.00mm
1.535”
30.00mm
1.181”
11.00mm
0.434”
40.00mm
1.575”
30.00mm
1.181”
11.00mm
0.434”
41.00mm
1.614”
31.00mm
1.220”
11.00mm
0.434”
41.43mm
1.631”
30.15mm
1.187”
11.43mm
0.450"
42.00mm
1.654”
32.00mm
1.260”
11.00mm
0.434”
43.00mm
1.693”
33.00mm
1.299”
11.00mm
0.434”
44.00mm
1.732”
34.00mm
1.339”
11.00mm
0.434”
44.62mm
1.757”
35.00mm
1.375”
11.43mm
0.450”
44.62mm
1.757”
35.00mm
1.375”
8.13mm
0.320”
45.00mm
1.772”
34.50mm
1.358”
11.00mm
0.434”
46.00mm
1.811”
35.50mm
1.398”
11.00mm
0.434”
46.20mm
1.819”
34.93mm
1.375”
11.43mm
0.450”
47.00mm
1.850”
36.50mm
1.437”
11.00mm
0.434”
47.78mm
1.881”
36.50mm
1.437
11.43mm
0.450”
49.00mm
1.929”
38.50mm
1.516”
11.00mm
0.434”
49.40mm
1.945”
38.10mm
1.500”
11.43mm
0.450”
50.00mm
1.969”
39.00mm
1.535”
11.50mm
0.453”
50.98mm
2.007”
39.67mm
1.562”
11.43mm
0.450”
52.32mm
2.060”
39.67mm
1.562”
11.43mm
0.450”
52.53mm
2.068”
42.85mm
1.687”
11.43mm
0.450”
54.15mm
2.132”
42.93mm
1.690”
11.43mm
0.450”
54.97mm
2.164”
44.45mm
1.750”
11.43mm
0.450”
55.73mm
2.194”
45.72mm
1.800”
11.43mm
0.450”
57.30mm
2.256”
47.50mm
1.870”
11.43mm
0.450”
