OK i had just got done rebuilding this motor. i did a medium streetport Microteck lt10s fd upper intake manifold and other stuff the car runs pretty good other than these problems with cooling and timing. the car will stay running at 180-185deg all day long at idle once i start driving it the temp will just go up the highest it has been is 200deg. If it gets hight i just stop and the temp goes down takes about 3 mins, but as soon as i go again it goes back up.



Now for timing the front rotor leading is 5deg atdc the trailing is 20deg atdc idle is 800 rpm.

rear rotor is leading 5deg atdc the trailing is 5 deg atdc idle 800 it runs good but at 3-8 vacuum on my boost gauge while on light throttle it is still a little rough.

now if i retard the timing to say 8deg i have to raise the idle too 900 and the thing pops and backfires unless i get on the throttle a little more than i like if i advance it too 3deg atdc it runs much almost perfect. HELP

did you flush the radiator after the rebuild?

I did the radiator 2 times and changed the oil 3 times motor has about 1 hour of running.

could you put a EGT or thermal couple in your exhasuts system? this might at least help narrow down your temperature issues to a cooling systme issue, or a hot combustion issue. it always helps to narrow down the possibilities...



if you can get a hold of this stuff, take a look at your EGTs when your coolant temp climbs, try and find out what normal EGTs are for the RPMs and loads you are observing.



K-type thermal couples cost about $25, but you need a multimeter (or special thermalcouple reader) to see the temps. purchasing an EGT sensor and gage might be worth the additional cost and time invovled since its always a good parameter to keep an eye on.

good luck

I'll try that. thank you