Engine Specs - S65 ValveTrain

Factory Camshaft Specifications

	MM	SAE
Base Circle	30.000	1.1811
Lift	11.400	0.4488

Intake Open	-1.000	ATDC
Intake Close	102.000	ABC
Exhaust Open	81.500	BBC
Exhaust Close	14.000	ATC

Schrick '284' Camshaft Specifications

	Base Circle: MM (SAE)	Lift: MM (SAE)	Opening Angle (° CA)	Spread	Intake Opens	Intake Closes	Exhaust Opens	Exhaust Closes
Intake Cam	30.000 (1.1811)	12.000 (0.4724)	284	132-74	12	90	68	36
Exhaust Cam	30.000 (1.1811)	12.000 (0.4724)	284	134-86	96	8	48	56

Schrick '292' Camshaft Specifications

	MM	SAE
Base Circle	30.000	1.1811
Lift	11.400	0.4488

Intake Open	-1.000	ATDC
Intake Close	102.000	ABC
Exhaust Open	81.500	BBC
Exhaust Close	14.000	ATC

Valve Guide Specifications

	MM	SAE
Intake Guide	5.017	0.1975
Valve Stem	4.971	0.1957
Clearance	0.046	0.0018

	MM	SAE
Exhaust Guide	5.017	0.1975
Valve Stem	4.966	0.1955
Clearance	0.051	0.0020

Cam Follower Specifications

Factory Cam Followers

	MM	SAE
Type	Hydraulic
Cup Type	Radius
Diameter	28.000	1.596
Weight	29.50 g	1.041 oz

Del West Cam Followers

	MM	SAE
Type	Mechanical
Cup Type	Radius
Diameter	32.000	1.260
Weight	25.00 g	0.882 oz

Valve Spring Retainer Specifications

Factory Valve Spring Retainers

Weight	TBD	TBD
Measured Specs	MM	SAE
Diameter	TBD	TBD
Thickness	TBD	TBD
Spring Perch Diam.	TBD	TBD

Valve Spring Specifications

Factory Valve Springs

Measured Specs	MM	SAE
Free Height	41.850	1.648
Weight	TBD	TBD
Wire Diameter	TBD	TBD
Coil Diameter (top)	TBD	TBD
Coil Diameter (bot)	TBD	TBD
Installed Height (L1)	39.00	1.535
Lift Height (L2)	11.430	0.450
Seat Pressure @ L1	245	55
Seat Pressure @ L2	778	175
Lift (L2 to Coil Bind)	2.413	0.095
Maximum Lift	TBD	TBD
Spring Rate	46.632	266.666
Spring Rate (lbs/mm)	10.500

Eibach Valve Springs (Originally Sold* by BE, Dinan, RD Sport)

Measured Specs	MM	SAE
Free Height	48.500	1.909
Weight	40.53	1.430
Wire Diameter	4.000	0.157
Coil Diameter (top)	22.000	0.866
Coil Diameter (bot)	26.200	1.031
Installed Height (L1)	41.75	1.644
Lift Height (L2)	11.430	0.450
Seat Pressure @ L1	400	90
Seat Pressure @ L2	1045	235
Lift: L2 to Coil Bind	3.566	0.140
Maximum Lift	13.000	0.512
Spring Rate	56.460	322.222
Spring Rate (lbs/mm)	12.686

NOTE *: These valve springs are no longer available.

Supertech Valve Springs (Currently Sold by BE)

Manufacturer Specs	MM	SAE
Free Height	50.500	1.988
Weight	42.92	1.514
Wire Diameter	3.900	0.154
Coil Diameter (top)	22.800	0.898
Coil Diameter (bot)	27.700	1.091
Installed Height (L1)	40.10	1.579
Lift Height (L2)	10.000	0.394
Seat Pressure @ L1	176	77
Seat Pressure @ L2	801	180
Lift: L2 to Coil Bind	TBD	TBD
Maximum Lift	12.200	0.480
Spring Rate	62.500	261.421
Spring Rate (lbs/mm)	10.300

Schrick Valve Springs

Manufacturer Specs	MM	SAE
Free Height	52.500	2.067
Weight	38.200	1.347
Wire Diameter	3.800	0.150
Coil Diameter (top)	26.000	1.024
Coil Diameter (bot)	26.000	1.024
Installed Height (L1)	39.000	1.535
Lift Height (L2)	13.000	0.512
Seat Pressure @ L1	396	89
Seat Pressure @ L2	980	220
Lift: L2 to Coil Bind	TBD	TBD
Maximum Lift	13.000	0.512
Spring Rate	44.923	255.859
Spring Rate (lbs/mm)	10.077