motor runs fine but once it gets hot coughs/splutters

[Mad max 1]

351 Cleveland when it gets hot its like it goes out of tune I have replaced the plugs and that fixed it until I went for a drive today and its done it again any ideas, once it cooled down now it winds over and hard to start and runs very rough when it starts and it wont keep going

 

[CHESTNUTXE 7,298]

[bear351c 10,269]

Ignition module..?

 

Coolant too hot.?

 

Timing out.?

 

 

[hendrixhc 10,918]

What carb setup?

[deankxf 20,262]

there'd be lots of potential things, 
if it has the vacuum switches that open when it warms up and aren't connected properly ..

 

shit leads caused BGDAV's F100 issues initially, they were new, but cheapies. 

coils when hot (faulty) can cause issues that change with heat. 

 

[SPArKy_Dave 8,863]

I vote reluctor coil in the distributor, and/or ignition module.

Same issue old mate has in the other thread. (except with a 6cyl dizzy)

[Mad max 1]

The new plugs sorted that out but new motor gets hot fairly quick new big alloy radiator 3 core correct thermostat 82 degrees seven blade flexi fan with shroud and the right length fan spacer everything is new including 351 clevo but it does have close chamber heads on it.

[Mad max 1]

On 16/12/2018 at 8:29 AM, hendrixhc said:

What carb setup?

600 speed master carby new looks like a holley

[SPArKy_Dave 8,863]

2 hours ago, Mad max said:

The new plugs sorted that out but new motor gets hot fairly quick new big alloy radiator 3 core correct thermostat 82 degrees seven blade flexi fan with shroud and the right length fan spacer everything is new including 351 clevo but it does have close chamber heads on it.

 

Got a pic of the thermostat that's in it?

[ESPSIX 143]

12 hours ago, Mad max said:

The new plugs sorted that out but new motor gets hot fairly quick new big alloy radiator 3 core correct thermostat 82 degrees seven blade flexi fan with shroud and the right length fan spacer everything is new including 351 clevo but it does have close chamber heads on it.

Possibly missing the restrictor that goes under the thermostat.

Or, head gaskets on backwards, very easy to do when fitting the heads.

[deankxf 20,262]

also water pump if not new i've seen the impeller blades rusted off some and still not leaking.