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Rover V8 Engine Cylinder Heads
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Page Contents
Cylinder Head Identification
Standard Cylinder Heads
Performance Cylinder Heads
Head Gaskets
Cylinder Head Bolts
Valves, Guides & Springs
Rocker Gear
Cylinder Head Identification
There are various types of cylinder heads available for the Rover V8, with only subtle differences between them. Not all are suitable for every application, so care must be taken when ordering replacement heads for your vehicle. Please note that reconditioned cylinder heads are only sold on an exchange basis (in pairs) and that we require similar type cylinder heads in return, otherwise a surcharge will apply.
Early Cylinder Heads
Early cylinder heads - as fitted to Rover P5B, P6, MGB V8 and early Range Rover - are fitted with small (38mm inlet, 33mm exhaust) valves and may not be suitable for use with unleaded fuel. These heads can be identified most easily by removing one of the spark plugs and measuring the length of the threaded section of the plug. If it measures 12.5mm, the cylinder head is an early type and is not suitable for exchange. If it measures 19mm, the cylinder head is post-1976 (SD1 or later).
Later Cylinder Heads
Identify later cylinder heads as follows:
1. Count the rows of cylinder head bolts. All cylinder heads have a row of head bolts inside the rocker covers; they also have a second row of 5 head bolts just below the spark plugs. Finally, cylinder heads up to around 1994 have a third row of 4 bolts just below the second row. 3.9, 4.2, 4.0 & 4.6 litre engines after this period have a total of two rows of head bolts.
2. Look at the ends of the cylinder heads, as fitted to the engine. There are tapped holes in the ends of each cylinder head, to which the ancillary component brackets are bolted. The number of holes determines which type you have, as follows:
3/3 bolt (3 bolt holes in each head)
3/4 bolt (3 bolt holes in one head, 4 in the other)
4/4 bolt (4 bolt holes in each head)
It is important that the cylinder heads you order are similar to the ones you have removed, otherwise your ancillary components may not fit.
Standard Cylinder Heads
Standard Cylinder Heads (pair)
Reconditioned. Exchange - all engines.
Complete with new valves, valve guides, springs & valve stem oil seals. Less rocker gear.
Reconditioned cylinder heads are sold only in matching pairs, with the actual combustion chamber size marked on them.
With 3 Rows of Head Bolts
Pre-’95 applications. 34-36cc combustion chambers.
3/3 End Bolt Type - (pr) - RB7095RA
3/4 End Bolt Type - (pr) - RB7095RB
4/4 End Bolt Type - (pr) - RB7095RC
With 2 Rows of Head Bolts - (pr) - RB7095RD
'95-on applications. 28cc combustion chambers. All 4/4 end bolt.
Standard cylinder heads are sold on an exchange basis: the old units must be serviceable and of a suitable type otherwise a surcharge will apply. If preferred, we can recondition your existing cylinder heads. Please note that early type (pre 1976) heads are not suitable as exchange units - please refer to Cylinder Head Identification.
Cylinder Heads - new;
Due to the numerous variations of cylinder heads and the complexity of part number supersessions, it would be too complicated to list a full range of new cylinder heads. However, if you require new cylinder heads, please contact our Sales Department for price and availability.
Performance Cylinder Heads
We offer three stages of modified Performance cylinder head, designed to suit different requirements and budgets.
Stage 1 - polished and lightly ported cylinder heads featuring bulleted guides and standard size valves. Suitable for standard and mildly tuned 3.5 to 4.6 litre engines.
Stage 3 - fully polished & ported, gas-flowed cylinder heads, featuring bulleted & shortened guides and fitted with Big Valves (41.45mm inlet, 36.5mm exhaust). Together with the right camshaft and fuel system, these heads offer a substantial power and torque increase, and are suitable for Performance engines up to 5.2 litres. See Comparison Chart.
Stage 4 - Ultra Big Valve heads. Fully polished & ported as Stage 3, but featuring 43.11mm inlet and 38.1mm exhaust valves. These cylinder heads are suitable for serious Performance applications, in engines of 4.6 litres and above, and require suitably modified fuel systems.
Performance Cylinder Heads (pair);
Exchange - all engines.
Complete with new valves, valve guides, springs & valve stem oil seals. Less rocker gear.
Performance cylinder heads are sold only in matching pairs, with the actual combustion chamber size marked on them.
Stage 1
With 3 Rows of Head Bolts
Pre - '95 applications. 34-36cc combustion chambers.
3/3 End Bolt Type - (1) - RB7467RS1A
3/4 End Bolt Type - (1) - RB7467RS1B
4/4 End Bolt Type - (1) - RB7467RS1C
With 2 Rows of Head Bolts - (1) - RB7467RS1D
'95 on applications. 28cc combustion chambers. 4/4 end bolt type.
Stage 3
With 3 Rows of Head Bolts
Pre - '95 applications. 34-36cc combustion chambers.
3/3 End Bolt Type - (1) - RB7467RS3A
3/4 End Bolt Type - (1) - RB7467RS3B
4/4 End Bolt Type - (1) - RB7467RS3C
With 2 Rows of Head Bolts - (1) - RB7467RS3D
'95 on applications. 28cc combustion chambers. 4/4 end bolt type.
Stage 4
With 3 Rows of Head Bolts
Pre - '95 applications. 34-36cc combustion chambers.
3/3 End Bolt Type - (1) - RB7467RS4A
3/4 End Bolt Type - (1) - RB7467RS4B
4/4 End Bolt Type - (1) - RB7467RS4C
With 2 Rows of Head Bolts - (1) - RB7467RS4D
'95 on applications. 28cc combustion chambers. 4/4 end bolt type.
Performance cylinder heads are sold on an exchange basis: the old units must be serviceable and of a suitable type otherwise a surcharge will apply. If preferred, we can modify your existing cylinder heads. Please note that early type (pre 1976) heads are not suitable as exchange units - please refer to Cylinder Head Identification.
Head Gaskets
Head Gasket Set;
3.5 Litre (88.9mm bore)
Tin Head Gaskets
To 1976 (pre SD1) - (1) - GEG165
1976 on - (1) - GUG1066HS
Composite Head Gaskets * - (1) - GUG1066HSCOM
3.9/4.2 Litre (94mm bore)
3 rows of cylinder head bolts.
Tin Head Gaskets - (1) - RB7447
Composite Head Gaskets * - (1) - RB7447COM
3.9/4.2/4.0/4.6 Litre (94mm bore)
2 rows of cylinder head bolts.
Composite Head Gaskets * - (1) - RA1233
5.2 Litre (96mm bore)
Composite Head Gaskets * - (1) - RB7684
Head Gasket Only;
3.5 Litre (88.9mm bore)
Tin Gasket - (2) - GEG340
Composite Gasket * - (2) - GEG340COM
3.9/4.2 Litre
3 rows of cylinder head bolts.
Tin Gasket - (2) - RB7448
Composite Gasket - (2) - RB7448COM
3.9/4.2/4.0 & 4.6 Litre
2 rows of cylinder head bolts.
Tin Gasket - (2) - ETC7819
Composite Gasket * - (2) - ERR7217
5.2 Litre (96mm bore)
Composite Gasket * - (2) - RB7685
*Composite head gaskets are thicker than standard tin gaskets and will therefore lower the engine's compression ratio. Ideal for correcting compression ratio when heads/ block faces have been skimmed. (Not applicable 1995 on).
Approximate gasket thicknesses are as follows:
Standard (tin) gaskets 0.5mm
Composite gaskets 1.2mm
Typical effect on compression ratio:
Standard (tin) gaskets 3cc
Composite gaskets 10cc
Cylinder Head Bolts
Bolt - cylinder head;
All engines up to 1995 (except late 3.9, 4.0 & 4.6)
Long (7/16" UNC x 3.9") - (6) - 602193A
Medium (7/19" UNC x 2.7") - (14) - 602192A
Order 13 if your engine has a dipstick retainer clamp on the head bolt adjacent to the dipstick.
Tapped Bolt (7/16" x 2.7") - (1) - 602450
For dipstick retained, if fitted.
Double-Ended Bolt - (1) - 602200
Fitted to some Range Rovers.
Short (7/16" x 2 1/4") - (8) - 602191A
1995 onwards (late 3.9, 4.0 & 4.6)
Note: These bolts can be identified by their flanged head. They do not need a separate washer and can be used on earlier engines.
However, they are not re-useable and must be replaced once removed.
Long (96mm) - (6) - ERR2944A
Medium (66mm) - (14) - ERR2943A
Note: The outer row of short bolts, or 'outrigger' bolts, has not been used since the introduction of the Series 2 Range Rover.
Washer - cylinder head bolts - (28) - 602098A
Cylinder Head Stud Kit - (1) - RB7680
Engine set of ARP cylinder head studs, washers and nuts to replace original bolts. Studs improve cylinder head sealing & prevent damage to block threads.
Valves, Guides & Springs
All parts listed are suitable for saloon, sport & 4x4 applications unless otherwise stated.
Various different valves have been used since the Rover V8's introduction; most having the standard 'Rover SD1' head diameter: inlet - 40mm, exhaust - 34mm. However, early engines (pre 1976) were fitted with smaller diameter valves - 38mm inlet, 33mm exhaust - which are less efficient. In order to benefit from the larger valve sizes, it would be more practical to fit a pair of later cylinder heads than to attempt to fit the larger valves to early heads.
Vitesse specification valves are of standard SD1 head diameter, with waisted stems just behind the valve head.
The largest valves that can be fitted to the existing valve seats (later heads only), without the need for extensive machining, are our Big Valves (Inlet - 41.4 mm, exhaust - 35.5 mm, with waisted stems). These valves are particularly suited to large capacity engines. (Note: some machining is required to the valve guide and seat).
Finally, the latest factory valves, as fitted to 3.9 & 4.2 engines since 1993, as well as the Series 2 Range Rover (4.0 & 4.6 engines), feature the same head diameter as SD1-type valves.
Note: All parts supplied are suitable for unleaded applications.
Inlet Valve;
Carburettor Engines -
Early Engines (pre 1976) - (8) - 602166
Head diameter: 38mm.
1976 on - (8) - 614088
Head diameter: 40mm.
Efi Engines - 3.5, 3.9 & 4.2 litre -
Head diameter: 40mm.
SD1 - (8) - ERC9088A
Range Rover -
Up to engine nos. 35D06576A, 36D14149A, 37D00751A & 38D23045A - (8) - ERC9088A
From the above engine nos. on - (8) - ERR1780
Series 2 Range Rover - (8) - ERR1780
'Big Valve' - (8) - RB7460
Head diameter: 41mm. With waisted stem.
Machining required to valve guide and seat.
Exhaust Valve;
Carburettor Engines -
Early Engines (pre 1976) - (8) - 602165
Head diameter: 33mm.
1976 on - (8) - 614089
Head diameter: 34mm.
Efi Engines -
Head diameter: 34mm.
SD1 - (8) - ERC9089
Range Rover
3.5 Litre - (8) - 614089
3.9 & 4.2 Litre - (8) - ERR7338
Series 2 Range Rover - (8) - ERR7338
'Big Valve' - (8) - RB7461
Head diameter: 35.5mm. With waisted stem.
Machining required to valve guide and insert.
Valve Seat Insert - inlet;
Early Engines -
Pre 1976.
Standard Size - (8) - 602052
Oversize +0.010" - (8) - 602223
All Other Engines - 1976 on -
Including Series 2 Range Rover.
Standard Size - (8) - ERC224A
Oversize +0.010" - (8) - ERC225A
Valve Seat Insert - exhaust;
Early Engines -
Pre 1976.
Standard Size Only - (8) - 614639
All Other 3.5 Litre Engines - 1976 on -
Standard - (8) - ERC210A
Oversize +0.010" - (8) - ERC211A
3.9, 4.2 litre & Series 2 Range Rover -
Standard - (8) - ETC8596A
Oversize +0.010" - (8) - ERC211A
Valve Guide - standard;
For use with standard cam.
All Engines up to 1994 - (16) - 603554
Plain topped; oil seals on inlet only.
Late 3.9, 4.2, 4.0 & 4.6 (1994 on) - (16) - ERR3648
Stepped top, for use with neoprene seals (ERR1782) and matching valves.
Valve Guide - performance;
Shortened & bulleted, for use with performance cam.
Suitable for all valves.
Car Set (inlet/exhaust) - (1) - RB7453
Individual -
Inlet - (8) - RB7463
Exhaust - (8) - RB7464
Valve Stem Oil Seal;
All Engines to 1994 (inlet only) - (8) - ERC7865A
'Tap washer' type, slips over valve stem.
1993 onwards (inlet & exhaust) - (16) - ERR1782
Neoprene type - not suitable for earlier engines (pre 1994): requires stepped valve guide (ERR3648).
Valve Spring - standard;
Double - early engines (up to 1976) -
Inner - (16) - 602241A
Outer - (16) - 602240A
Singles - 1976 on - (16) - UKC8137
Valve Spring - uprated (engine set);
Single - (1) - RB7454
Suitable for all engines with mild road camshaft. Uses standard retaining caps (ERC573).
Double (see note below) - (1) - RB7455
Suitable for all engines with fast road or road/rally camshaft.
Special retaining caps required (ERC573S)
Note: Machining may be required to spring platform when fitting double valve springs to engines previously fitted with singles.
Retaining Cap - valve springs;
Early Engines - (16) - 90602451
Fitted with double valve springs.
Single Valve Springs - (16) - ERC573A
UPrated Double Valve Springs - (16) - ERC573S
Split Cotter - (32) - ERC1637A
All models.
Rocker Gear
What is Lifter Preload
Lifter preload refers to the position of the pushrod seat in the lifter (cam follower) when the engine has been assembled and the lifter is positioned on the heel of the cam. Lifter preload must be checked whenever a non standard component which alters the distance between the rocker arm and the lifter - such as a high lift camshaft or performance cylinder head - has been fitted. Incorrect lifter preload will cause poor running, premature wear or, at worst, engine failure.
Check the lifter preload as follows:
With the lifters empty of oil, assemble the rocker shaft & pushrod components, making sure there is no wear in the rocker shafts, rocker arms & pushrods.
Checking each lifter in turn, positioned on the heel of the cam, measure the gap between the pushrod seat and the bottom of the circlip groove. There must be a clearance of .020" minimum and .060" maximum at this position.
If the clearance is greater than .060", use pedestal shims (603734SH) to decrease. Remember to use equal thickness shims under each pedestal of a shaft to avoid distortion or breakage.
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Rocker Shaft Assembly - (2) - 611660
Assembled, ready to fit.
Rocker Build Kit - (2) - 611660KIT
Includes parts ready for assembly.
Rocker Shaft Only - (2) - 606661
Pedestal - rocker shaft - (8) - 603734
Pedestal Shims - (1) - 603734SHIMS
Includes three sets of shims of different thickness.
Use to set lifter preload when fitting a new cam with higher lift than standard. See also adjustable push rods, below.
Use to set 'lifter preload' when fitting a new cam with higher lift than standard.
Rocker Arm;
Original Spec (alloy) -
Right Hand - (8) - 602153
Left Hand - (8) - 602154
Spacer Spring - rocker shaft - (6) - 602142A
End Spring - rocker shaft - (4) - 602148A
Wavy washer.
End Washer - rocker shaft - (4) - 602186A
Split Pin - rocker shaft - (4) - PC34
Push Rod;
Standard - (16) - 603378
Heavy Duty - (16) - 603378HD
Larger diameter shaft. Cylinder head guide holes may need enlarging accordingly.
Adjustable (set) - (1) - 603378ADJ
Set of pushrods, adjustable for length at the rocker end, allowing the lifter preload to be precisely set without shims.
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Fri, 25 Jul 2008
