XSRACINGGT

Pull timing out, it should fix your problem.

angcobra

As already mentioned in several posts above. Slow to turn when hot are indications from 2 possible problems, starter or timing advanced too much.
I would check timing to make sure it is okay first.
If timing is okay, I would replace the starter and install a heat shield.

WhiteWindsor

Everyone that mentioned the timing being advanced too much is probably right. I was tuning my 351 couple months ago and had the same problem. I did not tighten the dist. bolt and the dizzy moved. When i got home i set my timing back right and problem solved.

http://s194.photobucket.com/albums/z112/keithswearingen/?action=view¤t=c3a71cc9.pbw

dillon1340

mine was doing that too when it got hot. put a new starter in it now that one doing same thing. timing the same as it's been for years. i might try that heat shield stuff.

catskill

I know you mentioned new battery already, but just fyi on my 91GT I had the same problem. Would start fine when cold but slow crank and/or not starting when hot. I put a new battery in and now it starts all the time. Of course when the engine is hot everything expands and its tougher to turn over. I dont know how new your battery really is, but mine was pretty new also. Replacing it worked.

89mustangfive0

i had the same problem..put a new starter in worked fine and then 3 hours later cranked slow...my connections to the starter relay( firewall) and ground tot he block werent tight enough i tightned them car starts all the time

bighungrymatt

old thread... I would check battery grounds and slap a heat shield up on the starter

brentloftis

HAHA that's funny, its such a old thread but was exactly my problem this morning. I just replaced the starter in the truck, no problems now.

GT350

Take out timing, go slower! DUmb idea, I didn't build a bad *** motor so it would'nt run at its very best.
Solution: Gear reduction starter, BIGGER cables and 900+ cranking amps battery, any one of these will definitly help, all 3 will be the best starting you ever will have.