[Schaeff]

Where would I look for the code to find the original hp of a 67 chevelle ss?

 

[Schaeff]

I see that there is only one code for manual trans, and that was the 375 hp. is this correct?

 

[Mike]

There's more than one code:
ED 67 396 Chevelle 325 L-35 4-Spd 4-Brl
EF 67 396 Chevelle 350 L-34 4-Spd 4-Brl
EG 67 396 Chevelle 375 L-78 4-Spd 4-Brl
EH 67 396 Chevelle 325 L-35 4-Spd 4-Brl
EJ 67 396 Chevelle 350 L-34 4-Spd 4-Brl Holley, A.I.R.
EK 67 396 Chevelle 325 L-35 Power Glide 4-Brl
EL 67 396 Chevelle 350 L-34 Power Glide 4-Brl Holley
EM 67 396 Chevelle 325 L-35 Power Glide 4-Brl A.I.R.
EN 67 396 Chevelle 350 L-34 Power Glide 4-Brl Holley, A.I.R.
ET 67 396 Chevelle 325 L-35 TH-400 4-Brl
EU 67 396 Chevelle 350 L-34 TH-400 4-Brl Holley
EV 67 396 Chevelle 325 L-35 TH-400 4-Brl A.I.R.
EW 67 396 Chevelle 350 L-34 TH-400 4-Brl Holley, A.I.R.
EX 67 396 Chevelle 375 L-78 4-Spd 4-Brl HP Solid cam, Holley

and here's the location at the top right of the pic

 

[DaleM]

I see that there is only one code for manual trans, and that was the 375 hp. is this correct?

Can't imagine where you found that...?

Mike is correct there were only 3 hp ratings for the 396 in 1967, 325hp, 350hp, and 375hp. The particular suffix code was dependant on transmission type and whether California destined or not (A.I.R.).

See http://macswebs.com/cddemo/67cd/etr/engines/idcodes.html for all 67 Chevelle engine codes.

{Edit}
By the way, you'll only find the horsepower code on the engine block itself. There's nothing in the VIN or on the trim tag that'll give the car's original engine's horsepower rating if that's where you're going.