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08-16-2012, 12:27 PM
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#1 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Quick exhuast question
When coupling the pipe to stock rams horns and using the beveled donut gaskets, do you use a short thin tube piece inside the donut to keep it centered? I took apart my 72k20 and it had these in there but I don't see why they would be needed, it would just create a little more restriction I'd think? Seems like the 3 stud mount and donut itself would center everything just fine.
thanks, Jud
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore  )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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08-16-2012, 02:33 PM
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#2 |
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Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,701
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Re: Quick exhuast question
They have also seemed unnecessary to me. I've always left them out when replacing donuts and it looked like the donuts were lined up pretty well. I kind of assumed that the factory manufacturing process required them but since we can take our time we don't.
I've also seen posts showing quite a restriction with them in some cases and then a significant performance increase with them removed.
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"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
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08-16-2012, 04:01 PM
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#3 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,600
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Re: Quick exhuast question
The amount of 'restriction' would be immeasurable. With everything moving around, getting hot/cold. I use the sleeves myself, keeps 'em centered
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08-16-2012, 04:37 PM
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#4 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,228
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Re: Quick exhuast question
The sleeve keeps the hot gases off the packing. If driven hard the packing will burn out in short time without it.
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08-16-2012, 10:04 PM
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#5 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Quick exhuast question
I'm with wrenchbender.I like them.The donuts last a lot longer with them in.I do need to find a source since mine needs one.I guess I can get a pre-flared exhuast fitting and cut it.....
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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