Thread: 350 Spark plug & wire change

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I changed my plugs and wires today and now my car wont crank it was cranking fine before but i new they needed to bechanged.Help me out. I did not gap the plugs but wouldn't it still crank. the last ac delcos i put in i didnt gap those. these are Autolite 685. with accel superstock wires

By not cranking are you saying it won't turn over at all? Does it turn over and not start? Does it start to turn over then stop? Need more info. Not that I think it has anything to do with your problem, but why don't you take a few seconds to gap plugs before you install them?

Oldman2

Probably got the firing order wrong or your coil wire isn't on all of the way. Some coils/wires require a special adapter or "tower".

The car turnsover but wont fire up. Sometimes it seemslike it wants to fire but doesnt. could it be bad wires. i think i'll try putting theold wires on andsee what happens. It should be in the right order i pulled them one at a time. I dont know what the gap should be how do i find out. I'm new to doing this stuff myself but want to learn. This is a rebuilt 74-75 350

I checked the plugs and the plugs are dry. I'm going to gap the plugs and see what happens. would the car not fire if the plugs aren't gapped? It has stock heads with headers and air gap intake and 1.6 comp roller rockers.

Yes i pumped it before i tried to start and all the wires should be in the right place because i took them out and replaced them one at a time. Would the car not fire if the plugs arent gapped?

Question
What type distributor are you running? While changing the wires did you perchance unplug the HEI?? Is it still points?

I dont think its any way the wires could be wrong if i took them off one at a time. The car cranked fine before this. I hear accel wires arent good could they be faulty? Does these autolite 685s have to have the right gap in order to fire? what is the firing order and which side is #1 plug on? I new to this.

#1 plug is left front. Firing order 1-8-4-3-6-5-7-2.

I've only put about 15K miles on this rebuilt engine. What does this mean if The timing chain jumped Denny?

Its a 74-75 350

Don't do it with a screwdriver, you will shock the hell out of yourself. Clamp the metal part of a sparkplug to some bare metal on the engine with a pair of vise grips. Hook the plug wire to it and crank over the engine. You will be able to see a good blue spark if everything is OK.