What Header for a '71 GMC 4X4 3/4 ton 350 V8 4 speed Fits/Works best?
 

What Header for a '71 GMC 4X4 3/4 ton 350 V8 4 speed Fits/Works best?
Jeggs is recommending Headman Elite Series.

When I put headers on the JImmy, Heddman was the only one that fit without modifying clutch linkage. Someone else had problems but they may have had a big block. My recommendation is the 2 1/2" Corvette Rams Horns. I 86-ed my headers for the manifolds, 2 1/2" aluminized exhaust and Dynomax Hemi Turbo Mufflers. Not only does it feel just as powerful as the headers and 2 1/4" exhaust, it is QUIET and leak free. Speak softly and carry a big stick...

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70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable