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i just bought a rebuilt 390 from CME here in SC put it in but having some trouble with timing runs desent with timing advance unhooked still some spark rattling though at higher rpm's any suggestions tried everything but taking off timing cover and checking to see wuth notch they set the timing gears on
i just bought a rebuilt 390 from CME here in SC put it in but having some trouble with timing runs desent with timing advance unhooked still some spark rattling though at higher rpm's any suggestions tried everything but taking off timing cover and checking to see wuth notch they set the timing gears on
Sounds like your mechanical advance is way off. You either have too much advance or it's coming in too soon(rpm wise).
A good smooth advance curve should cure the engine damaging detonation.
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When I rebuilt my 76 360 engine I got a new distributor to go with it since the old one was original. However, it ran like garbage. I checked and double checked the timing, the timing gears, but nothing worked. That is, until I looked at the mechanical advance. The springs were so stiff it was unusable! I got some aftermarket springs from Carquest (the ones that said "off-road only") and some of those were so stiff they wouldn't work either. The best ones were the original stock springs, or the lightest ones in an aftermarket set.
thanks one of the guys i work with told me to get a curve kit which has different spings for the distributor in it but i'm honestly looking at the DUI systems from what i've read and heard that's the way to go there a little pricy though but it's for my toy i apreciate the info though every little bit helps i'm going to replace the carb today i got some trash in my other one and the float stuck it was new so i exchanged it 670cfm holly then i will do somemore adjusting