Valves & Guides

Pre-unit A Group

Model

Years

Valve guide

Valve

Inlet

Exhaust

Inlet

Exhaust

A7

1947-50 67-0031 67-0032 67-0029 67-0030

A7ST

1949-50 67-0031 67-0032 67-0189 67-0190

A7/ST

1951-57 67-0031 67-0031 67-0394 67-0395

A7

1958-62 67-0031 67-0031 67-0740 67-0741

A7SS

1954-55 67-1140 67-1140 67-0394 67-0395

A7SS

1956-57 67-1140 67-1140 67-0351 67-0532

A7SS

1958-62 67-1110* 67-1110* 67-0740 67-0741

A10/SF

1950-57 67-0031 67-0031 67-0323 67-0324

A10

1958-62 67-0031 67-0031 67-0742 67-0743

A10RR

1954-55 67-1140 67-1140 67-0323 67-0324

A10RR/SR

1956-57 67-1140 67-1140 67-0968 67-0967

A10RR/SR

1958-59 67-1110* 67-1110* 67-968 67-0967

A10RR/SR

1960-63 67-1110* 67-1110* 67-1551 67-0967
A10 RGS / SR 1960-63 – Oversize inlet 67-0961 67-0967

BSA actually fitted cast iron guides to the later aluminium alloy heads but we recommend the bronze as detailed above. We can of course supply the cast iron if preferred; they were fitted from engine numbers CA7SS 4024 and CA10R 5602.

We also have some oversize versions of 67-1110 valve guide – 0.002 and 0.004

Pre-unit B Group

Model

Years

Valve guide

Valve

Inlet

Exhaust

Inlet

Exhaust

B21/2

1937-39 65-0207

B20/23

1937-39 65-0042 (2) 65-0042 (lower)

B23 de Luxe

1939 65-0224

B24/25/26

1937-39 65-0152

B29

1940 65-1111 65-1110

B31/2

1946-48 65-1145 65-1144 65-1111 65-1110

B31

1949-60 65-1513 65-1514 65-1111 65-1110

B32 iron head

1949-53 65-1513 65-1514 65-1111 65-1110

B31/2 alloy head

1950-53 65-1511 65-1512 65-1111 65-1110

B32

1954-57 65-1595 65-1596 65-1759 65-1760

B33

1947-48 65-1241 65-1242 65-1239 65-1240

B33

1949-60 65-1515 65-1516 65-1239 65-1240

B34

1947-48 65-1241 65-1242 65-1239 65-1240

B34 iron head

1949-53 65-1515 65-1516 65-1239 65-1240

B33/4 alloy head

1950-53 65-1517 65-1518 65-1352 65-1353

B34

1954-57 65-1597 65-1598 65-1752 65-1753

M Group

Model

Years

Valve guide

Valve

Inlet

Exhaust

Inlet

Exhaust

M19

1937-38 66-0144 66-0143 66-0217 66-0215

M20/21

1937-39 66-0137 (2) 66-0137/8 66-0206 66-0208

M20/21

1940-63 66-0140 66-0139 66-0235 66-0236

M22/23

1937-40 66-0143 66-0142 66-0213 66-0211

M24

1938-39 66-0193 66-0194 66-0213 66-0211

M33

1948-57 65-1515 65-1516 65-1239 65-1240

Pre-unit C Group

Model

Years

Valve guide

Valve

Inlet

Exhaust

Inlet

Exhaust

C10/10L

1939-57 29-2109 29-2110 29-2120 29-2121

C11

1939-40 65-0037 65-0037 65-0208 65-0208

C11/11G/12

1946-58 65-0037 65-0037 29-2124 65-0208

C12

1940 29-2109 29-2110 29-2591 29-2592
17 Automatic or mechanical inlet valves “A mechanically-operated inlet valve is to be preferred, because it never sticks, no parts of it can get adrift in the cylinder, and the engine will run more slowly on a hill.”
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