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51 GMC 256 engine #1227824
Mon Jul 31 2017 04:24 PM
Mon Jul 31 2017 04:24 PM
M
mcannon  Offline OP
Shop Shark
Joined: Aug 2016
Posts: 114
West TN
Getting Ready to paint my motor will epoxy paint work on the intake and exhaust manifold or high heat paint. Tks Mike

Re: 51 GMC 256 engine [Re: mcannon] #1227829
Mon Jul 31 2017 04:40 PM
Mon Jul 31 2017 04:40 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC
Maybe on the intake - it would most likely burn/flake off the exhaust.

256 engine (1940/1941)?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 51 GMC 256 engine [Re: tclederman] #1227831
Mon Jul 31 2017 05:19 PM
Mon Jul 31 2017 05:19 PM
M
mcannon  Offline OP
Shop Shark
Joined: Aug 2016
Posts: 114
West TN
Thank You, Mike

Re: 51 GMC 256 engine [Re: mcannon] #1228075
Wed Aug 02 2017 01:27 PM
Wed Aug 02 2017 01:27 PM
C
CASO  Offline
Shop Shark
Joined: Jun 2011
Posts: 1,950
Warrenton, Oregon
I believe SPI Epoxy is good up to 450*f or so...


Give me ambiguity
or give me something else
Re: 51 GMC 256 engine [Re: CASO] #1228080
Wed Aug 02 2017 01:45 PM
Wed Aug 02 2017 01:45 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC
Originally Posted by CASO
I believe SPI Epoxy is good up to 450*f or so...
How hot do you think a Stovebolt's exhaust manifold gets?
- at idle?
- at sustained 55 mph?

SPI epoxy primer?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 51 GMC 256 engine [Re: mcannon] #1228123
Wed Aug 02 2017 05:35 PM
Wed Aug 02 2017 05:35 PM
U
Uncle Brad  Offline
Shop Shark
Joined: Apr 2014
Posts: 1,254
Huntsville, Alabama
mcannon I would use bees wax on the exhaust after it was warmed, or a produced exhaust "dressing", but not a "paint-type" product. The porosity of cast iron would allow for a decent painted finish only if there was never a drastic temperature change.

I am going to attempt to season my exhaust like a Lodge cast iron skillet this time. That's the best example I can think of.

I already gave the "high heat" paint companies their chance. That stuff just makes a lot of choking smoke happen when it's burning off. How hot does the Stovebolt exhaust manifold get???
Dayum hot.

Brad







Wrench Fetcher, PhD
Re: 51 GMC 256 engine [Re: Uncle Brad] #1228145
Wed Aug 02 2017 07:49 PM
Wed Aug 02 2017 07:49 PM
M
mcannon  Offline OP
Shop Shark
Joined: Aug 2016
Posts: 114
West TN
sounds like a great idea, Thanks, Mike

Re: 51 GMC 256 engine [Re: mcannon] #1228149
Wed Aug 02 2017 08:17 PM
Wed Aug 02 2017 08:17 PM
U
Uncle Brad  Offline
Shop Shark
Joined: Apr 2014
Posts: 1,254
Huntsville, Alabama
Calyx is the brand (I think?) of produced manifold dressing most often used. I think folks here have had some great results with it. It is easy touch-up from what I hear.

I will post my exhaust coating experiment here in the coming weeks.

Brad

Edit : it is Calyx


Wrench Fetcher, PhD
Re: 51 GMC 256 engine [Re: mcannon] #1228151
Wed Aug 02 2017 08:34 PM
Wed Aug 02 2017 08:34 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC
calyx manifold dressing (exhaust and intake manifolds)

It has to be easily "redressed" every year or two. This is very easily done with a toothbrush, with the manifold in-place

https://www.youtube.com/watch?v=xw4iKr1YllI

It is not quite so quick-and-easy. I did the "first coat" on a manifold/set off the engine, after media-blasting the manifold/set (just the exhaust manifold, or, both manifolds). You do not have to have bare metal (off the truck). You should, however, removed all grease and flakey-metal from the manifold.

Here is another description of application.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 51 GMC 256 engine [Re: mcannon] #1228184
Thu Aug 03 2017 12:47 AM
Thu Aug 03 2017 12:47 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 7,962
Virginia
I am a big fan of Calyx.

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