When the Pontiac Grand Prix was introduced in 1962, it was a new personal-luxury model based on the Catalina but equipped like a sporty version of the Bonneville. Throughout the years, the Grand Prix developed a reputation of high style, but by the time the 1968 Grand Prix was introduced, it became bloated and overwrought. Still, they are an unusual full-size cruiser, and this one on eBay is even more unusual due to its engine.
The standard motor for the 1968 Grand Prix was a 4-barrel 400 rated at 350 horsepower. Buyers could spec a delete-option 400 2-barrel or move up to two 428s. The first 428 was rated at 375 horsepower, while the second was the 390-horse 428 HO. As the most powerful motor in the Pontiac stable (at least on paper), the HO consisted of a high-performance camshaft, special exhaust manifolds, and chrome air cleaner, rocker covers, and oil cap, among other things.
As usual, the Grand Prix also had unique styling compared with the usual Catalina/Executive/Bonneville models. Most noticeable are the hidden headlights and flowing rear from backlight to bumper. The Grand Prix also received unique taillights, almost a precursor to the taillights used on 1970-72 A-bodies like the GTO. However, the overall effect did not win the hearts of consumers and little over 31,000 were built for 1968.
But out of those cars, only 100 were built with the 428 HO backed by an automatic transmission, according to the GM Heritage Center. This motor is rare for any Pontiac (only available in full-size models since General Motors had an edict restricting cubic inches in smaller car lines) so you aren’t likely going to find one in any model anytime soon. Currently at $12,100 and not yet meeting reserve, this GP possibly could be an affordable collector car that isn’t seen at every show.