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Username Post: Heat riser - '58 348 - what fits?        (Topic#372726)
mahlmann 
"12th Year" Platinum Supporting Member
Posts: 1922
mahlmann
Age: 78
Loc: Las Cruces, NM
Reg: 01-20-11
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


 


japete92 

Posts: 2092
japete92
Loc: No. Virginia
Reg: 01-18-13
03-10-23 04:26 PM - Post#2855606    
    In response to mahlmann

  • mahlmann Said:
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






 
Tony1963 
Frequent Contributor
Posts: 2072

Loc: Orlando Florida
Reg: 07-09-18
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.

People fear change because it threatens what they know, or what they claim to know.


 
VIN 58 
Silver Supporting Member
Posts: 128
VIN 58
Loc: ct
Reg: 03-23-10
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



 
DZAUTO 
Member #51
Posts: 9193

Loc: Mustang, OK, USA
Reg: 12-25-99
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).


Attachment: W-motor_hi-perf_2_12in.jpg (728.63 KB) 0 View(s)




Attachment: W-_motor_63-64_409_manifolds.jpg (219.36 KB) 0 View(s)






 
mahlmann 
"12th Year" Platinum Supporting Member
Posts: 1922
mahlmann
Age: 78
Loc: Las Cruces, NM
Reg: 01-20-11
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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