Msd

[spdbrake]

Originally Posted by hauss

Low speed works fine, high speed car starts overheat. Found hanging distributor also, suspect water pump maybe cavitation, turning to fast ? Will look into larger diameter pulley. Have to see what I have. Not sure exactly, how to tackle this problem.

You will need a smaller water pump pulley or a large crank pulley to increase the flow.

I have not come across any larger OD Gilmer crank pulleys though.

May be dumb question, but are you sure your puller fan pulls air into the engine compartment? If the polarity is reversed it can be a pusher and work fine at low speeds and then become an effective wall at higher speeds.

[hauss]

Their are no dumb questions. No fan is working correctly found out my distributor was worn out internally purchased a new one . not sure how they are made to work on the inside all I can tell you if you grab the top where the weights are you can turn it a little and it will stay there.Tried doing the same on the new one and it rotates right back. this is done with the weights in the closed position. Used blue stop heavy silver and light blue springs set timing to 17 total timing at 4000 rpm is 37 timing go right back to 17 at 850 rpm still have to test on road also new distributor has black base old one was all aluminum except the cap witch is still red. Had a hell of a time with the new install wires wrong location and distributor was 180 off went back to square one set motor to tdc on #1 cylinder moved distributor to new location and re timed all is good car is running great still have to road test. used new Inova timing light and very happy with it.