I need help on my 347 stroker, it keeps acting up.

Jon945-speed · 04-01-2002, 12:01 AM

Ok...so it's not my mustang but I do own a 67 Fastback...this particular one is a 68 coupe with a brandnew 347 in it. It has the gt-40 aluminum heads, not sure of what cam but it's been degree'd in, roller rockers 1.7 I believe, new distributer, the compression is normal on each (read 150), it has a new edelbrock 4-barrel carb, the plugs were black after it started acting up, now they're replaced with autolights...timing's correct as well so I was told...It started up and ran fine at idle for about an hour. Then he backed it up out of the garage and let it idle some more, then it started running very crappy and now it won't run at all. Also when it ran the battery cable got hot very fast.

I told him to replace the points with an electrical one, and the coil to a higher voltage one.

Any suggestions as to what this may be??? Sorry but this is all the info I have, the guy is my fiance's step father and I can't just leave a fellow mustang not running right. Thanks for any help.

Ron1 · 04-01-2002, 03:48 PM

If the plugs were black, it sounds like it is running extremely rich. He may want to jet down a few sizes. The battery cable also bothers me. Usually heat is a sign that the gauge of the cable is too small, but I am not sure if the plug issue goes along with the battery cable issue. I might start the car, and with a pair of insulated pliers, pull off each individual plug wire and hold it about 1/2 inch form the plug, to see if I have a good spark. Timing should be around 36-38 degrees total. That is where most small block fords are happiest, although my 347 likes 33 total.

Ron

04-01-2002, 12:01 AM	#1
Jon945-speed Registered Member Join Date: Mar 2002 Posts: 2	I need help on my 347 stroker, it keeps acting up. Ok...so it's not my mustang but I do own a 67 Fastback...this particular one is a 68 coupe with a brandnew 347 in it. It has the gt-40 aluminum heads, not sure of what cam but it's been degree'd in, roller rockers 1.7 I believe, new distributer, the compression is normal on each (read 150), it has a new edelbrock 4-barrel carb, the plugs were black after it started acting up, now they're replaced with autolights...timing's correct as well so I was told...It started up and ran fine at idle for about an hour. Then he backed it up out of the garage and let it idle some more, then it started running very crappy and now it won't run at all. Also when it ran the battery cable got hot very fast. I told him to replace the points with an electrical one, and the coil to a higher voltage one. Any suggestions as to what this may be??? Sorry but this is all the info I have, the guy is my fiance's step father and I can't just leave a fellow mustang not running right. Thanks for any help. __________________ Fully built 306, turbo after summer.

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04-01-2002, 03:48 PM	#2
Ron1 Registered Member Join Date: Sep 1999 Location: Vancouver, WA USA Posts: 439	If the plugs were black, it sounds like it is running extremely rich. He may want to jet down a few sizes. The battery cable also bothers me. Usually heat is a sign that the gauge of the cable is too small, but I am not sure if the plug issue goes along with the battery cable issue. I might start the car, and with a pair of insulated pliers, pull off each individual plug wire and hold it about 1/2 inch form the plug, to see if I have a good spark. Timing should be around 36-38 degrees total. That is where most small block fords are happiest, although my 347 likes 33 total. Ron