87 fox 393 stroker

my friend wanted a little more out of his 89 coupe. we had it bored .30 put a little bigger cam,and a cobra intake. now no matter how we set the timing ,or what we do the 4th,6th,7thand eigth cylinders dont fire. if anyone has an answer i would be grateful. thanks

Colorado_Mustang

Did you match the firing order to the cam? Or, you wiped out the cam.

87 fox 393 stroker

I built my 393 this was my first 5.0 build. but what is wiping out the cam? also we got the thing to fire up just fine once. but as soon as we put a load on the motor it droped the other four cylinders. thanks