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83 84 85 86 87 88 G body 442 Cutlass 455 powered stainless tubular headers fit

Price: 749.00 USD

83 84 85 86 87 88 G body 442 Cutlass 455 powered stainless tubular headers fit

BThornton design for that factory fit big block Oldsmoible tubular header made of polished stainless steel with a 1/2″ stainless steel flange to prevent warping.

Sold with a pair with gaskets and 3/8″ x 1″ bolts

Headers are made of stainless and weigh 20 pounds. Stock cast iron exhaust manifolds weigh 40 pounds.

These headers are fitted to replace your factory exhaust manifolds with tubular headers with no modifications needed. There are no issues with clearance with the starter, frame, Z-bar, dip stick, steering shaft, etc. All accessories will fit without modifications; all air conditioning, power steering, alternator brackets all attach to the engine as original

We have test fitted to 1965 442 with 455 and it is a very close fit to steering but clearance is perfect

These headers will only fit big block Oldsmobiles with 455, 425 & 400 engine from 1965 to 1976 and will fit all Oldsmobile powered cars as long as the steering box is mounted forward on the frame and not back toward the firewall like in the 1965-1970 B&C body cars such as Dynamic 88, Starfire, Delta 98 and Toronado.

These headers will fit all A body cars plus the G and F body cars equipped with big block Oldsmobile.

The exhaust outlet is best fitted to 2 1/2″ head pipes with factory style flair and will fit 2 1/4″ standard head pipes. Flowmaster will fit perfect but may require a down pipe, which your exhaust shop can make, for the 455 Oldsmobile.

Special torque sequence is needed…..do not tighten top center bolt until the other 4 bolts are tight, 25 pounds, start at the center 2 bolts then the 2 outer bolts then the center top bolt last

Please feel free to ask questions before purchasing. We stand behind all of our parts we sell on eBay so returns are not a problem. Your satisfaction is guaranteed!

Thornton Muscle Cars

832 Mine Rd

Quakertown, PA 18951

Due to supply chain demands and issues some items such as hardware, color etc may vary