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51 GMC 256 engine
#1227824 Mon Jul 31 2017 04:24 PM
Joined: Aug 2016
Posts: 114
M
mcannon Offline OP
Shop Shark
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
mcannon #1227829 Mon Jul 31 2017 04:40 PM
Joined: Sep 2001
Posts: 30,431
ace skiver
Maybe on the intake - it would most likely burn/flake off the exhaust.

256 engine (1940/1941)?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- 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 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 51 GMC 256 engine
tclederman #1227831 Mon Jul 31 2017 05:19 PM
Joined: Aug 2016
Posts: 114
M
mcannon Offline OP
Shop Shark
Thank You, Mike

Re: 51 GMC 256 engine
mcannon #1228075 Wed Aug 02 2017 01:27 PM
Joined: Jun 2011
Posts: 1,951
C
Shop Shark
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
CASO #1228080 Wed Aug 02 2017 01:45 PM
Joined: Sep 2001
Posts: 30,431
ace skiver
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 [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- 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 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 51 GMC 256 engine
mcannon #1228123 Wed Aug 02 2017 05:35 PM
Joined: Apr 2014
Posts: 1,255
U
Shop Shark
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
Uncle Brad #1228145 Wed Aug 02 2017 07:49 PM
Joined: Aug 2016
Posts: 114
M
mcannon Offline OP
Shop Shark
sounds like a great idea, Thanks, Mike

Re: 51 GMC 256 engine
mcannon #1228149 Wed Aug 02 2017 08:17 PM
Joined: Apr 2014
Posts: 1,255
U
Shop Shark
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
mcannon #1228151 Wed Aug 02 2017 08:34 PM
Joined: Sep 2001
Posts: 30,431
ace skiver
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 [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- 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 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 51 GMC 256 engine
mcannon #1228184 Thu Aug 03 2017 12:47 AM
Joined: Mar 2010
Posts: 9,442
5
Master Gabster
I am a big fan of Calyx.

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