VW / Audi 1.8T 20V

8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi

Athena Racing 330 series Cooper Ring cylinder head gasket.
For specific high horsepower applications, engine performance can be significantly improved by using Athena Cooper Ring gaskets, that are supplied with INOX steel ring. This technology outperforms conventional fire ring solutions.
Cooper Rings are oversize (also fits for oversize bores).

Part number starting with 330
Athena advantages
Reinforced material	Asbestos free composite raw material OE approved
Stainless steel ring (AISI304)	Separate stainless steel rings assure maximum sealing around cylinder bore also on NOS and/or turbo charged engine where boost is over 2 bars. No head and block machining required
Silicon beading	Silicon-based beading is applied on critical areas to improve sealing around all cooling water and oil passages

Bore diameter - 82.50mm
Thickness - 1.22mm
Reinz part number - 61-31955-10
OE part numbers:
058 103 383 Q
058 103 383 M
06A 103 383 AK
058 103 383 K
058 103 383 H

ARP is a manufacturer of fasteners/bolts found in engines and drivelines, ranging from OEM replacement parts to specialty hardware for racing applications. ARP is the world leader in fastener technology.

ENGINE BEARINGS
	CON ROD BEARING SET
	Part#
	4B1606H	4B1606HX
Sizes	STD, .025, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Identical Halves
Material	Tri-metal Hardened steel backs
Min Std Shaft Size	1.8802" /47.758mm
Max Std Shaft Size	1.8810" /47.778mm
Min Std Tunnel Size	1.9921" /50.600mm
Max Std Tunnel Size	1.9929" /50.619mm
Max Wall at Crown	0.0553" / 1.405mm	0.0548" /1.392mm
Max Overall Length	0.748" / 19.00mm
Notes	Bearing has 1.65mm oil hole at crown
Diagram        (Top View)

CT-1 is a Dry Film Lubricant coating that helps reduce friction and abrasive wear. It provides intermittent dry lubrication and is not affected by dust or dirt. CT-1 is specifically engineered to withstand the extreme conditions of today's high performance engines. Professional engine builders enjoy a higher level of confidence with increased embedability, strength and durability.

ENGINE BEARINGS
	CON ROD BEARING SET
	Part#
	4B1606H	4B1606HX
Sizes	STD, .025, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Identical Halves
Material	Tri-metal Hardened steel backs
Min Std Shaft Size	1.8802" /47.758mm
Max Std Shaft Size	1.8810" /47.778mm
Min Std Tunnel Size	1.9921" /50.600mm
Max Std Tunnel Size	1.9929" /50.619mm
Max Wall at Crown	0.0553" / 1.405mm	0.0548" /1.392mm
Max Overall Length	0.748" / 19.00mm
Notes	Bearing has 1.65mm oil hole at crown
Diagram        (Top View)

CT-1 is a Dry Film Lubricant coating that helps reduce friction and abrasive wear. It provides intermittent dry lubrication and is not affected by dust or dirt. CT-1 is specifically engineered to withstand the extreme conditions of today's high performance engines. Professional engine builders enjoy a higher level of confidence with increased embedability, strength and durability.

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1644H	5M1644HX
Sizes	STD, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.1243in / 53.958mm
Max Std Shaft Size	2.1251in / 53.978mm
Min Std Tunnel Size	2.3228in / 59.000mm
Max Std Tunnel Size	2.3236in / 59.019mm
Max Wall at Crown	0.0985in / 2.502mm	0.0980in / 2.489mm
Max Overall Length	0.728in / 18.49mm
Notes	Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.
Diagram        (Top View)

Engines VAG group 4 cylinder engines 1.6 1.8 2.0 16-20V (KR, PL, AEB, etc.)

Spring data:
Seat pressure: intake - 60lbs @ 36.60mm, exhaust - 91lbs @ 33.20mm
Spring coil bind: intake - 23.00mm, exhaust - 18.50mm
Max lift: intake - 13.60mm, exhaust - 14.70mm
Rate: intake - 6.70lbs/mm, exhaust - 12.50lbs/mm
Intake single spring:
Outer diameter - 20.60mm
Inner diameter - 14.40mm
Exhaust double spring:
Outer spring outer diameter - 30.20mm
Outer spring inner diameter - 22.20mm
Inner spring outer diameter - 22.20mm
Inner spring inner diameter - 16.80mm

Set includes:
Intake springs - 12 pcs. SPR-A2095
Exhaust springs - 8 pcs. SPR-H1002DR-AU
Titanium retainers: 12 pcs. intake RET-AU5VI-T2, 8 pcs. exhaust RET-AU5VE-T1
Seats - 8 pcs. exhaust SEAT-H1000

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.

The Super Alloy Engine valves represent the highest level of sophistication in valve technology. These valves are designed to handle the extreme heat requirements and punishment of today’s Nitro Fuels, Supercharged, Turbocharged, Nitrous Oxide, and Marine race motors.