Some Safari browsers are failing to connect secured pages Try the following: - refresh the page a few time to see if the page loads, if this fails please update the browser or try to browse the page in Firefox or Chrome. - Read more.
Minispares.com uses cookies to give a better browsing experience. Read more 
 
12G1963

VALVE GUIDE IN CAST IRON

That tell tale puff of blue smoke when you first start is an indicator of worn guides or seals. Valve guides should be replaced with every valve job. Sold individually these are the original quality Cooper S guides for use in any head that is leaded petrol or uses chrome stemmed valves.

Also suitable for any of our plasma or heat treated competition valves when using unleaded petrol.

Not for Turbo exhaust valves as they have a 8mm internal diameter.
  • £1.15 exc vat
  • £1.38 inc vat

 Out of stock

  • share
 
 

Recommended products

Showing 1 to 0 of 0 products
VALVE STEM TOP HAT SEAL A PLUS (Single)
ADU4905
£0.55
(inc VAT) £0.66

VALVE STEM OIL SEAL AS USED ON MPI MODELS
LJQ101160
£1.52
(inc VAT) £1.82

 

Alternative products

Showing 1 to 0 of 0 products
VALVE GUIDE SET (8) MANGANESE BRONZE TYPE
C-AJJ4037
£23.00
(inc VAT) £27.60

Manuals with this product

Showing 1 to 7 of 7 manual pages
 
 
 
Cylinder Head 850CC, 998CC & 1100CC Pre 'A' Plus

Engine

Classic Mechanical Parts Manual
997CC & 998CC Cooper Cylinder Head

Engine

Classic Mechanical Parts Manual
Cylinder Head, 998CC, 'A' Plus 1980 on

Engine

Classic Mechanical Parts Manual
Cylinder Head Cooper 'S' 970CC, 1071CC & 1275CC

Engine

Classic Mechanical Parts Manual
1275 Except Cooper 'S' & Turbo

Engine

Classic Mechanical Parts Manual
Cylinder Head 1275 Turbo & Heads with Triple Coll

Engine

Classic Mechanical Parts Manual
Cylinder Head

Engine

Classic Mechanical Parts Manual
 

Kits containing this product

Showing 1 to 0 of 0 products
HEAD UNLEADED 25cc CHAMBER SIZE FOR 1380cc
C-AHT133
£513.26
(inc VAT) £615.91

HEAD UNLEADED 35.7x29.2mm 9 STUD HEAD plus su......
C-AHT135
£513.26
(inc VAT) £615.91

HEAD UNLEADED MPI PERFORMANCE WITH ROAD VALVE......
C-AHT136
£487.08
(inc VAT) £584.50

HEAD UNLEADED ROAD/RALLY GAS FLOWED,92 ON ( +......
MSE6
£533.76
(inc VAT) £640.51

CYLINDER HEAD 5 PORT 940 ALLOY ROAD / RALLY
C-AHT347
£835.32
(inc VAT) £1,002.38

 

People also bought

Showing 1 to 0 of 0 products
VALVE STEM OIL SEAL AS USED ON MPI MODELS
LJQ101160
£1.52
(inc VAT) £1.82

VALVE INLET 295 CASTING
12G296
£5.50
(inc VAT) £6.60

VALVE EXHAUST TURBO
AHU1976
£7.00
(inc VAT) £8.40

OIL FILLER CAP RED LATE CARS/METRO
GFE6007
£6.80
(inc VAT) £8.16

VALVE EXHAUST 12G295 HEAD LARGE COLLET
AEA400
£3.55
(inc VAT) £4.26

INLET VALVE EARLY COLLET TYPE
2A877
£4.70
(inc VAT) £5.64

ROCKER SHAFT WASHER (10 THOU WIDE)
AEG169
£0.21
(inc VAT) £0.25

VALVE SPRING TWIN SET STD USE
C-AEA525
£19.50
(inc VAT) £23.40

ROCKER POST SPACER SINGLE PLATE
2A515
£2.37
(inc VAT) £2.84

VALVE INLET 88G459 COLLET TYPE
CAM6391
£7.00
(inc VAT) £8.40

EXHAUST VALVE WITH LARGE COLLET GROOVE 850 99......
AEA434
£3.71
(inc VAT) £4.45

ROCKER COVER GROMMET NEOPRENE CONTENT FOR LON......
12A1358MS
£0.55
(inc VAT) £0.66

31mm RIMFLOW EXHAUST VALVE
C-RIM107
£17.46
(inc VAT) £20.95

VALVE INLET 35.7 TRIPLE GROOVE RACE QUALITY H......
C-AEG543
£11.89
(inc VAT) £14.27

ROCKER COVER BLUE T BARS
SAC71BLUE
£7.50
(inc VAT) £9.00

VALVE SPRING SEAT SHIMS SET OF FOUR 0.060"
SS4
£6.60
(inc VAT) £7.92

VALVE GRINDING PASTE (LARGE)
MSA1005
£3.81
(inc VAT) £4.57

ROCKER COVER T BARS
SAC71
£4.50
(inc VAT) £5.40

VALVE INLET 33MM STD 1300 race quality
C-AEG569
£13.38
(inc VAT) £16.06

ROCKER COVER T BARS WITH CHROME FITTINGS
SAC71C
£7.00
(inc VAT) £8.40

Fitting instructions / Articles

C-AHT133 - Pre 1992 BUDGET UNLEADED STAGE 2 (ROAD ROCKET)


Modified to give maximum performance gain for cost.

LARGE-BORE HEAD, 24.5c chambers for large bore motors.

Inlet Valves: 35.6mm(1.401") dia. Original equipment type P/No. TAM1059
Exhaust Valves: 29.2mm(1.150") dia. Original equipment type P/No. TAM1061
Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides: AE Hepolite cast iron P/No. 12G1963
Valve Springs: Nominal 180lb. Max actual valve lift 0.400" P/No. C-AEA526
Stem Seals: Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905

Chamber Volume: Nominal 21cc Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished - to minimise drag. Multi-angle valve seats in head..

Cylinder Head - Unleaded Fuel Use


The specter of 'unleaded fuel only' - instigated in UK on January 1st 1999 and seemingly from decades ago across the rest of the world - seems to be forcing more and more folk into frightened, panic orientated action. And Mini owners are featuring heavily in this.

See bottom for useful part numbers.

The situation not at all being helped by all sorts of conflicting information from 'leaned' sources, such as lead levels in humans has declined greatly since 1935 - despite the rapidly expanding ownership of petrol-burning vehicles. And benzene and toluene used in unleaded fuels are cancerous.

Still, the powers that be are relentlessly forcing through the 'no heavy metals in fuel' bills, not being at all put off by such trivia. Not surprising bearing in mind the complete debacle on the catalytic converter front - the type decided on for world wide and universal use was developed and tested in California! As a consequence...

Valve Guides - Materials and Useage


Material choices for guides are down to two distinct types - cast iron and bronze. Yes, cast iron. NOT steel as described in many adverts and by vendors.

Never have been, never will be. These are as fitted to the various A-series cylinder heads as standard in all applications. Cast iron is used because it is a very dissimilar metal from any used in valve manufacture - important to eliminate galling that causes seizure of the valves in the guides - is softer, yet resilient enough to wear well. Bronze, on the other hand, is a very general description as there are a variety of 'bronzes' used by various folk. In days gone by, the bronze base type used was 'PB1' (also known as 'Navy Bronze') - a phosphor-bronze alloy that was very orange in colour, and very soft, used primarily in race engines. Unfortunately they wore out very quickly. Silicone-brass content bronze is probably the most popular now - often with a high aluminium or manganese content - is very yellow/gold in colour...

MSE6 - POST 1992 Unleaded Stag


Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow.

 MSE6 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE6, TAM1059, TAM1061, TAM2069, 12G1963, 12G1015, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Original equipment type    P/No. TAM1059
Exhaust Valves:  29.2mm(1.150") dia. Original equipment type  P/No. TAM1061
Exhaust seats: Latest type Beryllium-based for lead-free fuel    P/No. TAM2069
Valve Guides: AE Hepolite cast iron       P/No. 12G1963
Valve Springs: Nominal 140lb. Max actual valve lift 0.400"    P/No. 12G1015

MSE6 - POST 1992 Unleaded Stag


Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow.

 MSE6 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE6, TAM1059, TAM1061, TAM2069, 12G1963, 12G1015, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Original equipment type    P/No. TAM1059
Exhaust Valves:  29.2mm(1.150") dia. Original equipment type  P/No. TAM1061
Exhaust seats: Latest type Beryllium-based for lead-free fuel    P/No. TAM2069
Valve Guides: AE Hepolite cast iron       P/No. 12G1963
Valve Springs: Nominal 140lb. Max actual valve lift 0.400"    P/No. 12G1015

C-AHT135 STAGE TWO SPEC BUDGET LARGE BORE CYLINDER HEAD


Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively reworked. Stone-ground finish in ports promotes ultimate atomisation. Three angle valve seats in head. Standard Cooper ‘S’ size valves used. Combustion chamber volume used to boost standard compression ratio slightly for given application. Head mods applied greatly increase Volumetric efficiency, boosting actual working compression ratio. Compression ratio needs to be increased on lower compression engines where modified cam is used to maximise potential. Seek advice on what is needed...

Valve guides - Materials and usage


Never have been, never will be. These are as fitted to the various A-series cylinder heads as standard in all applications. Cast iron is used because it is a very dissimilar metal from any used in valve manufacture - important to eliminate galling that causes seizure of the valves in the guides - is softer, yet resilient enough to wear well. Bronze, on the other hand, is a very general description as there are a variety of 'bronzes' used by various folk. In days gone by, the bronze base type used was 'PB1' (also known as 'Navy Bronze') - a phosphor-bronze alloy that was very orange in colour, and very soft, used primarily in race engines. Unfortunately they wore out very quickly. Silicone-brass content bronze is probably the most popular now - often with a high aluminium or manganese content - is very yellow/gold in colour; modern technology facilitating very controlled manufacture of these specialist alloys.

Valve materials are very varied, but essentially there are three groups. The first is the old-style standard road spec, second up-rated standard road spec, and lastly race spec.