R 3500 P/U 2WD V8-454 7.4L VIN W 4-bbl (1988)
Valve Spring: Specifications
Intake
Exhaust
Closed
74-86 lbf at 1.80 in
74-86 lbf at 1.80 in
open
195-215 lbf at 1.40 in 195-215 lbf at 1.40 in
GMC Workshop Service and Repair Manuals
Pressure Values|Page 1734 >
< Seat Dimensions|Page 1729
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