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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2014 Posts: 1,293 Moderator for Tons o' Fun , Co-Moderator Driveline Forum | | Moderator for Tons o' Fun , Co-Moderator Driveline Forum Joined: Jul 2014 Posts: 1,293 | Exhaust manifold heat riser shaft has a lot of slop in it. What methods have others used when "rebuilding" the heat riser ?
Remove the shaft and bush the holes to the nearest size possible with shaft clearance of .010 on the diameter or other?
Make a new shaft to fit the worn holes in the manifold ? Making a new shaft looks to have some difficulties.
Any and all advice appreciated. I have a friend with a "machine shop" . If anyone has a "how to" written up, please share it. Thanks!
Ron - - Dusty53 1954 Chevy 3604In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell."
"They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel." | | | | | Joined: Feb 2004 Posts: 29,886 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,886 | Alternative solution- - - -unless you're getting a noisy exhaust leak, ignore the sloppy fit. Carbon buildup will cause even a moderately close fitting shaft to lock up pretty quickly. If you absolutely must replace the shaft and flap valve, drill and tap the manifold for brass bushings made from 1/4" NPT thread fittings, and drill and line ream the holes for a stainless steel shaft and flap valve. I've reworked several heat risers that way. That's the time consuming, E$$$$PENSIVE way to do it, but it will outlive your grandkids.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2014 Posts: 1,293 Moderator for Tons o' Fun , Co-Moderator Driveline Forum | | Moderator for Tons o' Fun , Co-Moderator Driveline Forum Joined: Jul 2014 Posts: 1,293 | Thanks Jerry! I don't know it it will have an undesirable exhaust leak or not. I guess we will find out. Thanks for the common sense approach suggestion. I tend to overthink just about everything.
Ron - - Dusty53 1954 Chevy 3604In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell."
"They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel." | | |
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