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different exhaust porting

  • Thread starter Thread starter texman51
  • Start date Start date
T

texman51

Guest
I am working on a 1982 gs1100L project, have two bikes , both 82 models. I recently put the better exhaust system on the bike I am going to use, and noticed the exhaust ports of the two heads are different. the one with a higher engine number has a hump cast into each exhaust port, and the lower engine number model has more straight ports. I was wondering if suzuki changed the castings for the heads during this model year? these are the 8 valve engines. Any thoughts, info on this?:)
 
The one with the humps would be called a "d" port head. It flows better with the hump. It is sought after by 8 valve tuners.
 
Thought the D-port head was released for the 1983 model year bikes?
 
Pretty sure you are right about 83 but the head could have been swapped at some point in the bikes life or it is a late 82 bike and the started to use the newer casting. I would guess head swap myself.
 
Another possibility is that his second bike is actually an '83, but has an '82 production date, therefore, somebody labelled it as an '82.

Common mistake at the title office.
icon_shrug.gif


.
 
that could be the thing, one may be a late 82 bike with the new head or a possible head change. I need to go look at the build date on both again. thanks for the insight on the heads!
 
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