 mahlmann
"12th Year" Platinum Supporting Member
Posts: 1922
Age: 78
Loc: Las Cruces, NM
Reg: 01-20-11
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 03-10-23 11:40 AM - Post#2855600
I need to replace the heat riser that goes into the exhaust pipe on our '58 348. What other engines use this same part? Would a heat riser from a '68 small block Camaro fit?
Any suggestions on where to find/order one?
Thanks folks!
Mike Ahlmann
Las Cruces, NM
'50 Tin Woodies (two) Ramon and Willard
'58 Impala Sport Coupe
'69 El Camino SS-396 (Soon going to NJ)
'16 Ford Explorer 3.5 EcoBoost - Red Rocket
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japete92
Posts: 2090
Loc: No. Virginia
Reg: 01-18-13
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03-10-23 04:26 PM - Post#2855606
In response to mahlmann
I need to replace the heat riser that goes into the exhaust pipe on our '58 348. What other engines use this same part? Would a heat riser from a '68 small block Camaro fit?
Any suggestions on where to find/order one?
Thanks folks!
I'm not familiar with the diameter of the 348 exhaust pipe. If it's 2 1/2", this should be an alternative:
https://show-cars.com/product/2841
If it's 2"; there's a different part # for that.
There is also a simple 'spacer', if you wish to look at that.
I do not know the diameter of that Camaro SBC exhaust pipe. But, match the diameters of the exhaust pipes.
Pete
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Tony1963
Frequent Contributor
Posts: 2046
Loc: Orlando Florida
Reg: 07-09-18
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03-10-23 05:23 PM - Post#2855609
In response to mahlmann
Looking at one of the heat riser gaskets on Rock Auto for a 58 Impala w/348 - there are a ton of GM vehicles that use the same gasket, so I'd imagine that other than the diameter of the pipe, nothing special about the 348 engine.
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 VIN 58
Silver Supporting Member
Posts: 128
Loc: ct
Reg: 03-23-10
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03-18-23 05:31 AM - Post#2855892
In response to Tony1963
Mike I bought one from show cars #1093 348 with 2” manifolds
Vin - 58 impala 348 3x2
- 2014 mustang convertible
- 2010 f 150 lariat
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DZAUTO
Member #51
Posts: 9191
Loc: Mustang, OK, USA
Reg: 12-25-99
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03-20-23 08:58 AM - Post#2855951
In response to VIN 58
Back in those days there were only TWO sizes of exhaust pipe which bolted to the exhaust manifold: 2in and 2 1/2in Period.
Thus, there were ONLY TWO sizes of exhaust heat riser flapper valves. Period
Small blocks (depending on which engine option) used both 2in and 2 1/2in.
W-motors (again, depending on engine option) used both 2in and 2 1/2in.
ALLLLLLLLLLLLLL Big block exhaust manifolds (396-402-427-454) ONLY had 2 1/2in outlets. Thus, alll BBs used the 2 1/2in heat riser valve.
This is what a Hi-perf (60-61) 348 manifold with 2 1/2in outlet looks like (top), and then in 63-64 is the 409 manifolds which sort of are made like headers (bottom).
ALLLLLLLLLL W-motor manifolds will bolt up to ANY W-motor head (348-409-427).
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mahlmann
"12th Year" Platinum Supporting Member
Posts: 1922
Age: 78
Loc: Las Cruces, NM
Reg: 01-20-11
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 03-20-23 09:45 AM - Post#2855953
In response to DZAUTO
Thanks for the detailed answer and pictures. Our 348 had the 2" exhaust system. I bought a heat riser for a '67 Camaro and it looks exactly like the original.
Mike Ahlmann
Las Cruces, NM
'50 Tin Woodies (two) Ramon and Willard
'58 Impala Sport Coupe
'69 El Camino SS-396 (Soon going to NJ)
'16 Ford Explorer 3.5 EcoBoost - Red Rocket
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