Mechanical changes: '73-'74

[MaineShark]

I've seen several mentions of mechanical upgrades being made to the '74 model year vs. the '73 (other than the obvious exterior differences). I was wondering if anyone knew what got changed?

Joe

 

[RMS73]

New in 74;
one piece seatbelt
different fan clutch
fan shroud, seal & mounting
two horns and relay moved to interior
alarm horn switch moved to front fender
evaporative emission canister connected differently
carb jets/metering rods different - smaller opening
heads & intake manifold different
wiper motor
master cylinder &booster
AIR not on cars with THM400
FE7 suspension offered
that is all I can think of now. Get the NCRS judging Guide it will lists alot of info.
Roger

 

[Tom73]

New in 74;
AIR not on cars with THM400

roger,
The A.I.R. system was not used on the L48 with Federal Emissions and the automatic. Calif, high altitude, and 4-speed L48s had the A.I.R. along with all L82's and LS4's.

tom...

 

[basilio]

74 improvements over 73

Here are some more improvments of the '74 over the '73:

Improved TH400
Magnets in PS system
Larger inside rear view mirror
Muffler resonators
Improved Astro ventilation
Improved radiator
Fully Electric Oil Pressure gauge--no worries about oil leak into passenger compartment