Chevrolet Small Block Headers
YES! Thornton designed headers for small block Chevy. Made for an easy fit with out the hassle of exhaust leaks. 
These headers were designed from a 1969 Camaro cast iron GM manifolds 3942529 and 3932376. They are a stock replacement for factory manifolds.
They will A, F, G and X bodies; Chevelle, Camaro, Z28, Nova, Malibu, 2WD Chevy P/U, El Camino, 4 speed and automatic cars with or without air conditioning.
  • These headers will fit in the same cavity as factory exhaust manifolds 
  • No need to move brake lines 
  • Mini starter is not needed
  • 1 5/8” primary tubes, 3” collector with factory fit 2 ½ exit flange (same as big block) with stock style exit flange and fits standard stock big block down pipe
  • They work with factory heat riser valve  
  • They work with air conditioning and power steering alternator  
  • Stock style exit flange with 3 bolt design with donut for no leak design
  • Uses stock big block down pipes
  • Thick, flat flange at cylinder head that will not warp 
  • They are designed to fit in tight spaces, same as the stock manifolds
  • Exit flange is located in same spot as the original but with a much larger outlet
A short spark plug is needed, this is common for headers.
We have test fitted them to a 70 Chevelle with a 350, power steering and ac. The #2 header tube is very close to the steering shaft but clears. Minor modification was needed for AC compressor support bracket and the power steering pump needs a spacer.

Chevrolet Small Block Headers


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