Heat Riser
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Senior User
Joined: Jan 2003
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From: willamette valley ore
Heat Riser
I'm swapping out the 352 engine in my '66 for another 352 from a donor '66. At some point my original engine had the heat riser disabled by removal of the butterfly plate in the casting. The donor engine has a heat riser with the butterfly plate intact but the spring holds the plate open when cold instead of closed. The picture shows the springs of the two units and that they are installed opposite from each other. The unit on the right is the intact unit with the plate open when cold. Has someone removed and reinstalled the spring the opposite way? I am still running with single exhaust. I disabled the riser in my '65 when I went to duals but I know it's there for a purpose in the single exhaust system. Any thoughts? Steve
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Steve, it was to aid the carb while using the choke in cold weather and has no real value beyond that. No modern carbs use it at all.
Get your truck running, then if you want to go back and fiddle with it for kicks & giggles you can have at it, otherwise...................
John
Get your truck running, then if you want to go back and fiddle with it for kicks & giggles you can have at it, otherwise...................
John
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Steve, I disabled mine (when I still had one) with no problems also. You probably will never really need it, given where you live.
I would HIGHLY recommend you consider changing the exhaust over to the later style without the heat riser valve. While you have the engine(s) out, it is much easier to solve problems such as extracting broken bolts.
Word of advice: Be sure to consider the issues it presents when working on exhaust.
The exhaust manifold for the valve is unique - the exit port is cast with a flat surface, not a rounded one. You cannot use an exhaust donut there.
If you replace the exhaust manifold, use one from a 360/390 to get the donut shaped casting.
However, this means you will need to change the downpipe, as the original one is too short.
When I changed mine out, I used the left and right side pipes from Advance Auto, specifying those from a '76 F-150 with a 390.
They fit my 352 perfectly.
I left it that way until I changed to a 460 dual exhaust.
I would HIGHLY recommend you consider changing the exhaust over to the later style without the heat riser valve. While you have the engine(s) out, it is much easier to solve problems such as extracting broken bolts.
Word of advice: Be sure to consider the issues it presents when working on exhaust.
The exhaust manifold for the valve is unique - the exit port is cast with a flat surface, not a rounded one. You cannot use an exhaust donut there.
If you replace the exhaust manifold, use one from a 360/390 to get the donut shaped casting.
However, this means you will need to change the downpipe, as the original one is too short.
When I changed mine out, I used the left and right side pipes from Advance Auto, specifying those from a '76 F-150 with a 390.
They fit my 352 perfectly.
I left it that way until I changed to a 460 dual exhaust.
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Senior User
Joined: Jan 2003
Posts: 357
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From: willamette valley ore
Thanks for the input. I will use the one that has already been disabled. I have seen many of these heat riser valves but the one that I have that works freely, is the only one I have ever seen that was complete and working. I will clean it up and put it in the archives. You never know when some purist will come along and won't be able to live without it. Steve
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1965/67 F100/350 352 // 1973/76 F100/350 360/390 Heat Riser Valve
D3TZ9A427A replaced C5TZ9A427D .. Heat Riser Valve / Obsolete
Fits: 1965/67 F100/350 352 // 1973/76 F100/350 360/390.
D3TZ9A427A =
WESLEY OBSOLETE PARTS in Liberty KY has ONE = 606-787-5293.
KLIMESH MOTOR SALES in Calmar IA has ONE = 563-562-3241.
MILLER OBSOLETE PARTS in Binghamton NY has ONE = 800-546-7278.
JST AUTOMOTIVE in Lebanon TN has ONE = 615-443-3086.
GREEN SALES CO. in Cincinnati OH has FIVE = 800-543-4959.
-----------------------------------------------------------
C5TZ9A427D =
MILLER OBSOLETE PARTS has ONE.
ANTIQUE AUTO SUPPLY in Arlington TX has TWO = 817-275-2381.
GREEN SALES CO. has TWO.
WESLEY OBSOLETE PARTS has SEVEN.
Fits: 1965/67 F100/350 352 // 1973/76 F100/350 360/390.
D3TZ9A427A =
WESLEY OBSOLETE PARTS in Liberty KY has ONE = 606-787-5293.
KLIMESH MOTOR SALES in Calmar IA has ONE = 563-562-3241.
MILLER OBSOLETE PARTS in Binghamton NY has ONE = 800-546-7278.
JST AUTOMOTIVE in Lebanon TN has ONE = 615-443-3086.
GREEN SALES CO. in Cincinnati OH has FIVE = 800-543-4959.
-----------------------------------------------------------
C5TZ9A427D =
MILLER OBSOLETE PARTS has ONE.
ANTIQUE AUTO SUPPLY in Arlington TX has TWO = 817-275-2381.
GREEN SALES CO. has TWO.
WESLEY OBSOLETE PARTS has SEVEN.
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