Pontiac Firebird

Year	Total Produced	Engine availability in cubic inches/Horsepower
1967	82,560	230six/165-215hp, 326V-8/250-285hp, 400/325hp
1968	214,224	230six/175-215hp, 350V-8/265-320hp, 400/330hp

Year	Total Produced	Engine availability in cubic inches/Horsepower
1969	87,708	250six/175-230hp, 350V-8/265-325hp, 400/330-345hp

Year	Total Produced	Engine availability in cubic inches/Horsepower
1970	48,739	250six/155hp, 350V-8/255hp, 400/265-335hp
1971	53,124	250six/145hp, 350V-8/250hp, 400/300hp, 455/325-335hp
1972	29,951	250six/110nhp, 350V-8/160-175nhp, 400/250nhp, 455/300nhp
1973	46,313	250six/100nhp, 350V-8/150hp, 400/170hp, 455/250-310nhp
1974	73,729	250six/100nhp, 350V-8/155hp, 400/175-225hp, 455/250-290nhp

Note: Starting in 1972, the "net" horsepower rating system went into effect and meant that the motors were tested with all their equipment attached, which resulted in lower horsepower numbers, making them appear to have less power than they actually had. The auto makers had to start lowering compression ratios in 1971 and this resulted in some horsepower loss, but it wasn't until 1975 that muscle cars were dealt their final blow. Compression was lowered even more to allow cars to run on unleaded fuel. Big block engines became extinct, and the smaller engines were so underpowered it was pathetic.