ive seen 2 different types of air cleaner decals that have 400 on them. one is a big block turbo jet style and the other is a small block turbo fire style. which stlye came on a 400 small block? the turbo fire decal has 300 horse power. what were the various horse power ratings for 400 small blocks?

I wonder the same thing. I didn't remember the 400's not having a whole lot of HP but ....
Here is a link with some decals. They have a 300HP and a 255HP and a generic 400.

http://www.harmons.com/main2.asp?urlcatid=Decals&urlsubcatid=Air+Cleaners&PaintLitApparel=yes

tht site lists the 400 turbo jet style as a 400 big block. im guessin maybe some 402s had a 400 decal.

Turbo-Fire = Small Block

Turbo-Jet = Big Block

-Mark.

i wonder if the 400 turbo jet style is even an original gm decal. does anyone know the various horse power ratings for 400s over the years?

I had one of the "Turbo Fire" 400 SB's in my 1970 Pick-up! It developed a woppin' 265HP! :eek:
My roommate had the 330Hp 4 Barrel version in His Monte Carlo with a 4-speed - that was a one year only offering. It was a real tire-frier! That was the Highest Output 400 available from the factory in either a Car or Truck. Torque was @ 415 on his and 400 for mine - if I remember right.
The engine in my truck was a great torque producer and worked very well for the towing duties I used it for.
The full size car and truck versions all had 2 Barrel Rochesters, std 4 Barrel (versions didn't come along until the mid 70's and were rated @ 170~175 HP.
My truck had a Turbo 350 and it's my understanding that many of these engines used the lighter duty 350 v.s a TH 400 except in Taxi/Police/HD applications.
The first 3 years (70~72) used 4-Bolt Mains, 73 and later were 2-Bolt.
The cranks were all cast.
HP ratings for most of the standard car/truck engines were;
1970 = 265
1971 = 255
1972 = 170
73~74 = 150
75~80 = @170/175

I've built a couple 400's for people and have always been impressed with their torque and performance in low to mid RPM range.