Cylinder Head / Valves


 

Performance Cylinder Heads

On Friday May 4th 2007, the final version of the “Merlin F85” heads were dyno tested. The heads were fitted to a 5 litre engine, which had been converted from a 3.9, using our 5litre stroker kit. The heads performed very well, we obtained 353ft lbs of torque. Also, the torque exceeds 321ft lbs between 2500 & 5500rpm. These figures were obtained using 10.5:1 compression, and our new “Tornado” camshaft, 224/231 degrees @ .050” lift, .508”/.512” lift. The cylinder heads are much stiffer than the standard Rover unit, which can distort easily, and the rocker gear is not very stable. Two extra rocker pedestals are supplied for each head. Rocker covers are supplied, complete with bolts. Valve guides are manganese bronze, and the valves are stainless (1.73 & 1.45”). The exhaust seats are very hard, and will withstand most fuels including LPG. As supplied, the heads are good for .520” lift. Use an PP-BYRC9YC spark plug to begin with. Exhaust ports are raised slightly. Regular inlet manifolds fit.
SMALL BATCHES MADE AT A TIME SO ALLWAYS A WAITING LIST. PLEASE ASK FOR AVAILABILITY

PP-DW1917 Merlin F85 cyl heads for 3.9ltre & above, price for pair.
£1610.18

 

Inlet Valves


PP-CX2250 1.568” Head 4.602” Length
SUH3 magnetic material, HD
£4.26

PP-DW500 1.630” Head 4.595” Length
Stainless steel [21-4N]/tuftrided with a wafer tip
£6.83

 

Exhaust Valves


PP-CX2220 Head Dia: 1.312”
Overall Length: 4.612”
£8.81

PP-DW555 Head Dia: 1.356”
Overall Length: 4.613”
Stainless steel [21-4N]/tuftrided with a wafer tip
Waisted stem
£6.74

PP-DW501 Head Dia: 1.400”
Overall Length: 4.595”
Stainless steel [21-4N]/tuftrided with a wafer tip
£7.67

 

Cylinder Head Plugs


PP-CX2750 Cup plug
£0.85

PP-CX2254 Threaded plug
£1.47

 

Valve Seat Inserts


PP-CX2204 .010” oversize for SD1 inlet valve. Price each.
£18.08

PP-DW535 Exhaust seat RS Merlin head. Price each.
£4.45

PP-DW530 Inlet seat RS Merlin head. Price each.
£3.36

PP-AZ1500 Unleaded/LPG exhaust seat
O.D. 1.5075”. Depth .3265”. Throat (narrowest point) 1.14”. Price each.
£4.55

 

Valve Guides

The modified guides have their tops shortened for a higher lift cam and have their noses modified for better gas flow.

PP-DW135 Modified exhaust guide. Pirce each.
£1.88

PP-DW125 Modified inlet guide
£1.88

PP-CX2300 Std-early plain type. Price each.
£1.01

PP-DW200 Std-late type for hooded seal. These guides are semi-finished and need reaming to size. Price each.
£1.50

 

Valve Springs


PP-CX2264 Inner v/spring for Pre SD1.
Price for set.
£3.59

PP-CX2274 Outer v/spring for Pre SD1. Price for set.
£3.83

PP-CX2284 Single spring for SD1. Price for set.
£2.16

 

Valve Spring Shims

Packet of Iske shims to go under the valve spring. 1.25”O.D. and .625” I.D. Contents- 16 of .010”: 16 of .015”: 16 of .020”: 16 of .030”

PP-BY6 Shim kit
£51.70

 

Spring retainers/top caps


PP-DW520 Dual spring assys [PP-DW550]. Price for set.
£75.93

PP-CX2230 SD1 single spring. Price each.
£2.97

 

Alternative Valve Springs

The fitted length for each cam varies, check the sheet supplied with each cam.

PP-DW550 Dual Assembly. Price for set. Use top cap- PP-DW520
£88.33

PP-DW060 TLR50 spring
Pirce for set. These springs have less coils, eliminating spring binding with higher lift cams. For use with cams DW262/DW270/DW268 with SD1 cylinder heads, not for Racing.
O.D. 1.212” Press. 75lbs @ Check Ht. 1.54” Press 200lbs @ 1.04”
£40.33

 

Valve Locks/Colletts


PP-AZ6705 Race 8620 for 10 degree SB Chevy cap - Set
£50.61

PP-AZ6700 Race 8620 HD steel-std SD1 top cap- set
£50.61

PP-CX2194 Standard for top cap. Each
£2.04

 

Valve Stem Seals


PP-CX4580 Late type-full hooded style - each
£1.57

PP-CX2286 Rubber seal for SD1 inlet valve - each
£1.00

 

Cylinder Head to Block Bolts

For Merlin Heads only

PP-BYAJG605 Long bolt 10req - price each
£3.98

PP-BYAJG600 Short bolt 10req - price each.
£3.38

 

ARP - Rover - Head Studs 7/16”
ARP

Rover - Head Studs 7/16”

ARP Head Studs ensure more consistent torque values, enhance cylinder head sealing, and help prevent damage to the threads in the block. The kit comes with aerospace-quality hex nuts and parallel ground, hardened washers. Tensile strength of 190,000 psi. (14 per head) Torque 65 ft lbs using ARP Moly lube [BY100-9903].

PP-AZ510 ARP Head stud set
£173.14

 

Cylinder Head to Block Bolts


PP-CX2334 2-1/4” (7/8 per engine) - price each
£5.58

PP-CX2354 2-11/16” bolt (14 per engine) - price each
£2.58

PP-CX2314 3-7/8” bolt (6 per engine) - price each
£3.60

PP-CX2344 Dipstick bolt (1 per engine)
To attach the dipstick bracket on some models. 1/4” x 2.28”
£22.91

 

Moroso - Moroso Head Bolt Washer

Moroso Head Bolt Washer

The washers are machined from 4130 chrome moly steel, heat-treated and parallel ground. They will not bend or gall. The washers will promote accurate torque readings and more evenly distribute stress loadings. Also good for main bearing caps, rocker arm stands, etc. Note: washers are a must when using aluminium heads. Chamfered side of washer should be toward the head of the bolt.

PP-BY38300 For 7/16” (28 per engine) - Price each
£0.90