LS1 valve spring install height
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
LS1 Valve System
Valve Lifter Hydraulic Roller
Valve Rocker Arm Ratio 1.70:1
Valve Lash Net Lash--No Adjustment
Valve Face Angle 45 degrees
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm (Maximum) 0.002 in (Maximum)
Valve Seat Width (Intake) 1.02 mm 0.04 in
Valve Seat Width (Exhaust) 1.78 mm 0.07 in
Valve Stem Clearance (Production--Intake) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Production--Intake) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Production--Exhaust) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Service--Intake) 0.093 mm (Maximum) 0.0037 in (Maximum)
Valve Stem Clearance (Service--Exhaust) 0.093 mm (Maximum) 0.0037 in (Maximum)
Valve Stem Diameter (Production) 7.955-7.976 mm 0.313-0.314 in
Valve Stem Diameter (Service) 7.9 mm (Minimum) 0.311 in (Minimum)
Valve Spring Free Length 52.9 mm 2.08 in
Valve Spring Pressure (Closed) 340 N at 45.75 mm 76 lb at 1.80 in
Valve Spring Pressure (Open) 980 N at 33.55 mm 220 lb at 1.32 in
Valve Spring Installed Height (Intake) 45.75 mm / 1.8 in
Valve Spring Installed Height (Exhaust) 45.75 mm / 1.8 in
Valve Lift (Intake) 11.99 mm 0.472 in
Valve Lift (Exhaust) 12.15 mm 0.479 in
Valve Guide Installed Height (Measured from the Cylinder Head Spring Seat Surface to the Top of the Valve Guide) 17.32 mm 0.682 in
Valve Stem Oil Seal Installed Height (Measured from the ValveSpring Shim to Top Edge of Seal Body) 18.1-19.1 mm 0.712-0.752 in
Valve Lifter Hydraulic Roller
Valve Rocker Arm Ratio 1.70:1
Valve Lash Net Lash--No Adjustment
Valve Face Angle 45 degrees
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm (Maximum) 0.002 in (Maximum)
Valve Seat Width (Intake) 1.02 mm 0.04 in
Valve Seat Width (Exhaust) 1.78 mm 0.07 in
Valve Stem Clearance (Production--Intake) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Production--Intake) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Production--Exhaust) 0.025-0.066 mm 0.001-0.0026 in
Valve Stem Clearance (Service--Intake) 0.093 mm (Maximum) 0.0037 in (Maximum)
Valve Stem Clearance (Service--Exhaust) 0.093 mm (Maximum) 0.0037 in (Maximum)
Valve Stem Diameter (Production) 7.955-7.976 mm 0.313-0.314 in
Valve Stem Diameter (Service) 7.9 mm (Minimum) 0.311 in (Minimum)
Valve Spring Free Length 52.9 mm 2.08 in
Valve Spring Pressure (Closed) 340 N at 45.75 mm 76 lb at 1.80 in
Valve Spring Pressure (Open) 980 N at 33.55 mm 220 lb at 1.32 in
Valve Spring Installed Height (Intake) 45.75 mm / 1.8 in
Valve Spring Installed Height (Exhaust) 45.75 mm / 1.8 in
Valve Lift (Intake) 11.99 mm 0.472 in
Valve Lift (Exhaust) 12.15 mm 0.479 in
Valve Guide Installed Height (Measured from the Cylinder Head Spring Seat Surface to the Top of the Valve Guide) 17.32 mm 0.682 in
Valve Stem Oil Seal Installed Height (Measured from the ValveSpring Shim to Top Edge of Seal Body) 18.1-19.1 mm 0.712-0.752 in
Last edited by Tin Indian; Dec 18, 2003 at 08:48 AM.
Staging Lane
Joined: Dec 2001
Posts: 90
Likes: 0
From: San Clemente, CA
stock spring install height is the stock install height of the LS1 valve spring at 1.800 or 1.750?
Hi,
The spec in 1.800" but both of my LS1 engines were setup at 1.780" from the factory. 1.750" is the old SBC spec which gets people confused. Even Manley has it wrong on there website for there 423 spring.
Steve
Hi,
The spec in 1.800" but both of my LS1 engines were setup at 1.780" from the factory. 1.750" is the old SBC spec which gets people confused. Even Manley has it wrong on there website for there 423 spring.
Steve
