H1F8-86
Spark plug for GM engine
Spark plug:
Thread diameter: 14mm
Sleeve size: 13/16" (20.63mm)
Reach: 0.372" (9.45mm)
Gap: 0.035" (1.1mm)
For engines:
Pontiac:
V8: 287 - 316 - 326 - 347 - 350 - 370 - 389 - 400 - 455
Chevrolet:
L6: 217 - 236
V8: 265 - 283 - 307 - 327 - 348 - 350 - 400
Mopar (Chrysler)
V8: 239 - 259 - 260 - 270 - 273 - 299 - 303 - 317 - 318 - 383 - 400 - 440
Cadillac:
V8: 331
Buick:
L6: 263