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#1 |
Registered User
Join Date: May 2016
Location: Debary, FL
Posts: 46
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Heat Riser Mod?
Original 1978 350 on k5 Blazer
Does it appear from these pics that the PO got rid of operational heat riser? If so, could I replace air cleaner with aftermarket one and valve cover breather (that doesn't connect to air cleaner) and get rid of the riser tube altogether? I'm in central Florida so doesn't get real cold. The PO hacked up the stock air cleaner pretty good to fit on edelbrock carb so I wanted to replace. The sensor has been removed from air cleaner. From reading other threads it seems purpose is to heat up carb when cold but someone also mentioned removing could contribute to fuel percolation in carb due to lack of air flow? Any other reason to keep? Thanks. |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,615
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Re: Heat Riser Mod?
Sure you can take the tube and the connector on the manifold off and install a different air cleaner.
You'll still need a breather on one cover and a pcv on the other cover. THe heat riser diverted exhaust heat under the intake plenum below the carb to help warm ups. With no heat riser you won't get much (if any) heat there but you might want a heat spacer under the carb to keep it cool during the hotter temps of summer. The fuel can boil out of the eddy carbs under high heat conditions. |
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#3 |
Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,736
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Re: Heat Riser Mod?
I removed a lot more than the tube on mine http://67-72chevytrucks.com/vboard/s...d.php?t=622936
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#4 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Heat Riser Mod?
Yeah, you dont need any of that stuff especially in Florida. What's important is maintaining the "positive crankcase ventilation" like Geezer99 indicated. One valve cover should support the PCV valve piped to the base of the carb, the opposing valve cover needs a "vented cap" similar to the chrome cap in this pic. You can still use that cool chrome breather assembly to, or sell it to me!
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#5 | |
Registered User
Join Date: May 2016
Location: Debary, FL
Posts: 46
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Re: Heat Riser Mod?
Quote:
That is cool |
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#6 | |
Registered User
Join Date: May 2016
Location: Debary, FL
Posts: 46
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Re: Heat Riser Mod?
Quote:
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