RX7Club.com - Mazda RX7 Forum - Got blown coolant seal? i did

i bought a very nice 1988 GTU the guy said he had a bad engine...didnt knwo what...i bought it because it was so cheap 400.00, rebuilt trans nice paint good rims so i didnt care about the engine well looking around here i found that Kevin landers at RotaryResurrection.com had a write up that Paul Yaw wrote on a Tempary Coolant fix for a blown water jacket i was going to put a turboII engine that i had laying around in it, but i said what the heck iall try and do this so called temp fix using block weld..you have to follow the instruction very carefully
cleaning the entire cooling system, anyways i let it sit over night instead of "at least three hours" after this, the car has started every time, gain in power and runs alot smoother this is only the second day but very good results at the end iall repost later on about it holding up or not and for how long. people claim months and beyond so give it a try...and thank you Paul and Kevin whoever wrote or has posted this!

Note* car ran like poo before after above post runs alot bettrer!
on anotrher note, after this, i installed new plugs chnaged oil...i will set timmimg tommrow and tps, it rumbles at high rpms..? around 4-6 maybe a stumble but more of a rumble..? it has ok power in higher rpms its not like it cuts out..just rumples like counterweight? smooth at idle, any ideas? the owner said it over heated (blew a hose coolant everywhere onwer stated no smoke and didnt get to H on meter) did the poor mans comp check all even pules..would could this be? messed up housings? bad counter weight? could this be a off blance or wrong counter weight for the flywheel? thanks for any help this car will be for sale soon if anyone wants a nice GTU details about engine later....