Normally Aspirated 337 STC's

[hharney]

HERE'S A LIST FROM OWEN BELL AT AVIATION ENTERPRISES
HIS WEB SITE IS LISTED ON THE WEB SITE TAB ON THE HOME PAGE

STCs for Skymasters:
Mechanical cowl flap conversion
for 336 and 337
Gross weight increase to 5120 lbs
Performance Package
40 gallon Auxillary Fuel tanks
Rocket Winglets (performance enhancements)
STOL kit
Tail boom to vertical fin fairings (large/medium)
Flap gap seals for 336
Fuel jettison system
Additional Items:

3 bladed propellers for all Skymasters
2000 hour TBO
30 lbs lighter per propeller
5 db quieter
Up to $2500 trade in credit for your 2 bladed propellers
Air conditioning for all Skymasters
310-375hp engine conversions for all Skymasters
Inflatable door seals for all Skymasters
Air stair doors for 63-72 Skymasters
up to 140 gallon aux tanks
Intercoolers for T337s
Composite spinners and bulkheads for all Skymasters
New replacement cowl flap motors for all Skymasters (Up to $500 trade in credit for your motor. Up to 60% off OEM prices.)
Turbocharger support brackets for all Skymasters
Custom STCs