Mad max 1 Posted December 14, 2018 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 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
bear351c 10,270 Posted December 14, 2018 Ignition module..? Coolant too hot.? Timing out.? 2 Mad max and deankxf reacted to this Share this post Link to post Share on other sites
hendrixhc 10,920 Posted December 16, 2018 What carb setup? 1 Mad max reacted to this Share this post Link to post Share on other sites
deankxf 20,288 Posted December 16, 2018 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. 1 Mad max reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,873 Posted December 17, 2018 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) 1 Mad max reacted to this Share this post Link to post Share on other sites
Mad max 1 Posted December 23, 2018 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. Share this post Link to post Share on other sites
Mad max 1 Posted December 23, 2018 On 16/12/2018 at 8:29 AM, hendrixhc said: What carb setup? 600 speed master carby new looks like a holley Share this post Link to post Share on other sites
SPArKy_Dave 8,873 Posted December 23, 2018 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? Share this post Link to post Share on other sites
ESPSIX 143 Posted December 23, 2018 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. Share this post Link to post Share on other sites
deankxf 20,288 Posted December 24, 2018 also water pump if not new i've seen the impeller blades rusted off some and still not leaking. Share this post Link to post Share on other sites