If I recall, the 428s in '68 were in the Grand Prix and optional in most the other "big" cars; Bonneville, Catalina, Ventura, etc. but not available in the Lemans/GTO or Firebird.
Rumor has it Royal Pontiac did the "Bobcat" treatment to some Firebirds and swapped in 428's.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
Just curious, why is there hood emblems out there that are 428 and 455? Is that just for guys who swap out their motors and drop those beasts in,goat hoods or do these repop makers know something that we don't? Not exactly on topic but not too far off topic
David
http://FirstGenFirebird.org/show/closeup.mv?CarID=571 If i don't get this car back on the road soon i'm gonna go postal! On a quest for FGF knowledge 1968 Pontiac Firebird Convertible 1969 Oldsmobile Cutlass "S" Convertible *Sold*
They are also being reproduced to fit in the Firebird's mounting holes. These are aftermarket reproducitons, and they DO know that a lot of us are putting bigger-than-factory displacement motors in our birds.
Back in the 80's I bought 428 emblems for 69 Firebird. They were almost an inch thick and looked ridiculous on the hood. I ended up putting one on my air cleaner. Jim
Not exactly on topic but not too far off topic 
