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PostPosted: October 11, 2017, 5:24 pm 
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My 350 is the shop for some tune up work,Jack calls me today and says #1,2,3 cylinders are reading in the 450 degree range and that #4,5,6 are showing a temperature in the 200/250 degree area measured on the exhaust manifold,using a thermal measuring device. I told him to proceed with a compression test and call back tomorrow.Also had a Pertronix Ignitor installed with Flame Thrower coil.Engine was down on power and my tune up last week did not help much that's why I let the pro's have a go at it ........Any thoughts on a condition like this??
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Dan

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PostPosted: October 11, 2017, 9:17 pm 
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Sounds like a coolant flow problem

I had a dodge that had a piece of tin tube in the head
If it wasn't installed, coolant didn't flow in the back

Not sure if a 300 has such a device

Weak water pump ?

450 sure seems extreme though....
Can't hardly believe that type of heat

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PostPosted: October 12, 2017, 11:33 am 
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At those temps, sounds like you have some cylinders not working well, or at all. I’d be looking toward a common problem affecting those three cylinders, assuming common manifold.
Spark plug condition should have provided a clue; compression check will pretty well tell the tale as to mechanical integrity. That leaves the FAST part of the CFAST equation! Got the C(ompression), that leaves the Fuel, Air, Spark, Timing:

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PostPosted: October 12, 2017, 1:00 pm 
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Do you have the later style two piece dual exhaust manifolds on it?

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PostPosted: October 12, 2017, 5:55 pm 
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Not split,the old style one piece......how might that play into it??

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PostPosted: October 12, 2017, 6:39 pm 
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Mr. Jones wrote:
Not split,the old style one piece......how might that play into it??


I was just taking a shot in the dark that *maybe* if you had the split manifold then *maybe* the front three cylinders' exhaust was plugged somehow.

This is a real head scratcher...did your mechanic have any suggestions after your compression test?

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PostPosted: October 12, 2017, 8:45 pm 
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Are you running a 2 bbl carb ?
Could one side be running leaner ?

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PostPosted: October 13, 2017, 6:10 am 
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Called Jack back yesterday,cancelled the compression test....$85.00hr.The engine runs better than when it arrived so I'm getting it home and do that test myself.....that won't be until next week..Will post the results then and at their hourly rate the comp.test money will buy a decent infrared detector........meanwhile I'm open to all info....
This post is in a state of temporary suspension........I'll be back........
Pat,Brandon and Paul thanks
Dan

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PostPosted: October 13, 2017, 9:31 am 
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I bought a cheap detector from harbor freight
I ain't a fan of Chinese stuff
But it was only like $30
Works ok.. red laser dot ,not very bright
Digital readout kinda small
Not for a mechanic that would use it everyday
Ok for somebody that rarely uses it

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PostPosted: October 13, 2017, 10:01 am 
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I would check timing on the 4th cylinder in rotation which I think is 6, it should show the same as 1 if different a broken cam could still be turning but be a few degrees late.

Of course this is from the SWAG method.


Johnny

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