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How To Install Summit Headers

  • Disconnect negative battery cable.
  • Remove the exhaust manifolds. (6 bolts on each side)
  • Remove the starter and clutch linkage if applicable.
  • On 1975 Lemans remove the starter heat shield and throw away.
  • Remove the oil filter from engine. you may want to replace it with an AC45 or Fram PH3429 for better clearance when done.)
  • Remove shift linkage, steering lockout device, and chassis support rods on later models.
  • Remove the center bolt from both engine mounts.
  • Place jack with a wood block under engine oil pan and raise motor. Be sure to check for clearance while raising motor.
  • Replace any worn out motor mounts.
  • Slide in headers and start the bolts on the ends first.
  • Cut slots in gasket to drop in onto the two bolts started.
  • With header still loose put clutch linkage back in.
  • Put in remaining header bolts, start with most difficult ones first.
  • Tighten header bolts while "easing" header down.
  • Lower engine down and check header clearance while aligning motor mounts up
  • Reform lockout linkage and install.
  • Install starter and oil filter, again the AC45/Fram PH3429 or equivalent allow more room to work with.
  • Replace any lost fluids.
  • Check around headers for proper clearance of fuel, transmission, brake lines, and etc.
  • Bolt up reducers to exhaust pipes.
  • Re-attach battery ground wire.
  • After a couple of days to "break in" re-torque all bolts
  • Header specs: they are four tube with 1/4" flange and on my 78 T/A with 255/60/15 BFG Comp T/A's the lowest point is 4-1/2" from the ground.

    Look here for you Pontiac Headers



Feel free to drop me a note. * I am looking for some good articles for the third and fourth gen birds. If you have any that you would like to see on this site send them to me and I will post them on my site.     

  • The information in here is just an outline.
  • The author claims no responsibility for the info contained in these pages. 
  • If unsure of any tip or modification seek a professional for the job.
  • In some states this may violate pollution laws
  • Check with your state on the laws.
  • Not affiliated with Pontiac or General Motors