April 5, 2026: LEMON Manuals is launched! Read the announcement.

Valve Arrangement

E-I-I-E-E-I-I-E (both banks, front to rear).

Fig 1: Pontiac & Tempest V8 Engines Firing Order

G09362246

Courtesy of GENERAL MOTORS COMPANY

SPARK PLUGS

Gap (All)	.035" (.033-.038")
Torque (All)	15-25 Ft. Lbs.

Spark Plug Type

421" & Tempest with 389" Engine

AC 44S

All Others

⁽¹⁾ AC 45S

⁽¹⁾	Use AC 44S with trailer package and Police. Use AC 43S for heavy duty service.