Hi, can anyone give me a rough estimate on how much horsepower a 67 Firebird with a 400ci engine would have, aswell as an estimate on the gas mileage.

Thanx in advance
~ Andyman :grinno:

Hi, can anyone give me a rough estimate on how much horsepower a 67 Firebird with a 400ci engine would have, aswell as an estimate on the gas mileage.

Thanx in advance
~ Andyman :grinno:

My 78 T/A dyno tested stock 400 american gave 218Hp
and 273ft/Lbs

my 69 firebird 400 has 640 HP and 540 trq... nto exactly stock though... maybe 6 miles gallon. MAYBE

That's alot of horsepower Meyaht... drag racer?

Hi, can anyone give me a rough estimate on how much horsepower a 67 Firebird with a 400ci engine would have, aswell as an estimate on the gas mileage.

Thanx in advance
~ Andyman :grinno:If it's the original high compression engine with 2 barrel, around 260hp. with 4 barrel 290hpif it's the rare Ram air 400 360hp. When my Firebird was stock with 2 barrel, 400 2:72 gearing auto I got almost 21 MPG. now with a 427 BBC, 4:10's 4 spd. closer to 10 MPG.

Latest issue of Hemmings Muscle Cars has a review of the 68 Firebird 400 H.O. It lists stock rating at 335 horsepower and 430 lbs of torque. Also, it states that the 4 barrel on Firebirds has a restrictor to prevent 4 barrel from opening completely. No mention of M.P.G. rating. That is very dependant on the rear gear.