Engine Specs - S65 ValveTrain

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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 (Original Hydraulic)

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

Factory Cam Followers (Mechanical Conversion)

MM SAE
Type Mechanical
Cup Type Radius
Diameter 28.000 1.596
Weight 30.13 g 1.063 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

Measured Specs MM SAE
Material TBD
Outer Diameter TBD TBD
Inner Diameter TBD TBD
Thickness TBD TBD
Weight TBD TBD

Schrick Valve Spring Retainers

Measured Specs MM SAE
Material Titanium
Outer Diameter 25.85 1.018
Inner Diameter 18.300 0.720
Thickness 7.500 0.295
Weight 6.00 g 0.212 oz

Valve Spring Specifications

Factory Valve Springs

Measured Specs MM SAE
Free Height 41.850 1.648
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
Weight TBD TBD

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

Measured Specs MM SAE
Free Height 48.500 1.909
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
Weight 40.53 g 1.430 oz

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
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
Weight 42.92 g 1.514 oz

Schrick Valve Springs

Manufacturer Specs MM SAE
Free Height 52.500 2.067
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
Weight 38.20 g 1.347 oz