Hedman Hedders has been putting together its world famous headers using mild steel tubing and flanges for more than 50 years. Although Hedmans are extremely durable, the mild steel material used by all header manufacturers is no match for the harsh conditions of an engine compartment. Even coated headers will fall victim to environmental conditions over time. Hedman 304 Hedders virtually neutralize the power of nature and the heat of the engine compartment. Built entirely of type 304 stainless steel (flanges, tubes, collectors), Hedman 304s are considered "the best of the best". As this video states, the 304 stainless steel used for 304s withstands heat better, and resists corrosion far better than mild steel materials.
All Hedman 304 stainless hedders are available HTC (ceramic-metallic) Coated for vehicle owners who prefer a polished look in their engine compartment. To find out what applications are available in Hedman's 304 line, click here: http://www.hedman.com/categories/?id=6620.
Hedman Hedders SEMA 2010
Marc Lewis and Chris Vandergriff showcase Hedman's new products to Xceleration Media at SEMA '10. Jeff Georges also joins them to talk about the partnership and products between Muscle Rod and Hedman Hedders.
Pontiac 350/421 Heads 1-3/4" Hedman Headers Flowmaster 2.50" Crossflow:
First fire-up video of my 1975 Firebird Formula with Pontiac 350 using '092' 421, small chamber/small valve heads. Camshaft is a custom ground UD with .466"/.467" lift - 220°/226° @ .050" on a 111.5° LSA. Cranking compression is 185-190 psi. Headers are 1-3/4" primary, 4-tube Heddmans #28150 with mandrel-bent, full-length 2.50" Exhaust system. Muffler is a Flowmaster #42585 Transverse-mounted crossflow with mandrel-bent 2.50" tailpipes and factory-style, 2.50" stainless steel hockey-stick tips. Carb is n 800cfm Q-Jet with .070" main/idle air bleeds, .074" main jets, .045" primary metering rods, 8 in/Hg power piston spring, .037" idle tube restrictions, .046" idle channel restrictions, 'G' secondary metering rod hanger with .029" (CC) metering rods. Transmission is a M-20 Muncie with a 8.5" disc brake 10-bolt with 3.23:1 gears. Car went on to produce 311 RWHP and 325 lbs/ft RWTQ on pump gas through the mufflers. Ignition is HEI with zero ohm carbon button, .080" AC R46SZ plugs .080" gap and 20° BTDC at idle, 8° of manifold vacuum advance (28° total @ idle) 16° centrifigal, 44° total timing.
1966 New Yorker with Flowmaster Super 44's and X pipe
This is how it sounds after being tuned.
'452 heads, rebuilt by Aerohead
Comp XE268H cam
Edelbrock Performer RPM intake
Edelbrock 750 Carb
Carter electric fuel pump
High output alternator
Rebuilt 727 trans with TCI shift kit
3.55:1 rear end in '489 housing
Fresh brakes all around (disc swap in front)
Fresh front end rebuild
New tires (really big ones)