1967 Pontiac Firebird H.O.

1967 Pontiac FirebirdTRUE BARN FIND VERY NICE VERY ORIGINAL SEEMS TO BE WITH YK BLOCK 428  AUTO TRANS POWER STEERING POWER BRAKES SUPER CLEAN RUST FREE RALLY WHEELS FACTORY PALE YELLOW ALL PONTIAC HISTORICAL SOCIETY We Finance For More info please call 631-620-3330or email hollywoodmotors@yahoo.com Visit Hollywood Motors online at www.hollywoodmotorsusa.com to see more pictures of this vehicle or call us at 516-CAR-GUYS today to schedule your test drive.
In 1967 the basic 421 design's bore was increased to 4.12 in (105 mm). this gave a displacement of 426.61 cubic inches (6,990.9 cc) or a 427. The 428 had the same 4 in (100 mm) stroke as the 421, yet retained the 421's 3.25 in (83 mm) Main journal, and was produced from 1967 to 1969. This engine produced 360 and 376 hp (268 and 280 kW) in 1967, 375 and 390 hp (280 and 291 kW) in 1968 and 360, 370 and 390 hp (270, 280 and 290 kW) in 1969. The crankshaft in the 428 also had a "N" cast on them as opposed to the 421's Armasteel. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. This new material had stronger alloys in the iron. All 428 engines were factory installed in large cars only. However, there were a few dealers that would install a 428 in a customers GTO or Firebird for higher power levels. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up.

It was replaced by the 455 for the 1970 model year.