Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Valve Spring

Valve Spring Compression Pressure (lbs) at Specific Height
Intake (allowable limit 10% loss pressure) 74-82 (lbs) at 1.78 inch
Intake (allowable limit 10% loss pressure) 196-212 (lbs) at 1.36 inch
Exhaust 76-84 (lbs) at 1.60 inch
Exhaust 190-210 (lbs) at 1.20 inch
Valve Spring Free Length (Approximate)
Intake 2.04 inch
Exhaust 1.85 inch
Valve Spring Assembled Height
Intake 1-49/64 - 1-51/64 inch
Exhaust 1-37/64 - 1-39/64 inch
Valve Spring Out of Square (Maximum) 5/64 (0.078) inch