So some of you already know about my Trans shift module going bad and dumping fluid into the top end of the engine. As a result I now have fowled plugs. so my question is I have a 72, 350 4BBL that has been bored over 0,60 over with 70 pistons and an Edelbrok Cam one step up from stock. I have always been running AC Delco spark plugs. What I am wondering is should I stay with them or is there a better plug that would be recommended? She's not a racer but a cruiser so please take that into consideration.
Thanks all in advance for your recommendations.

 

Stay with what you had, should be RJ45 or 46

 

X2, stay with what's in there now. If your still running points, use stock gap. If an HEI, open the gap to .045.

 

NGK for the win

 

So how much does that come out to be?

 

Thanks oldcutlass ! I'm not running an MSD ignition. but to stay stock I have stock looking distributor with Petronics. So should I go to the .045 Vs ,035 of the stock setting? and I will stay with the AC Delco Plugs. I had E3's several years ago but didn't really impress me ! Sorry I'm a great detailer, but suck at mechanics ! I leave that to my best friend who is a mechanic !

 

Stay at .035"

 

That’s a pretty big overbore. 😏

 

Stock spec in some books is .040, while others is .035. Either will work.

 

I use to be a big AC Delco fanatic. That changed years ago when everything started to be outsourced. I refuse to pay top shelf price for 3rd world products with a trusted name stamped on the box.

NGK plugs work well.

 

I was just looking into this. Autolites are Chinese now, but I read that some NGK are US made.
I just took the Autolites out of the engine that were installed last year. I KNOW I gapped them during installation; it just happens. Upon removal, the gaps were from 030 to 070 with little wear on the electrode. I'm wondering if the ground strap got soft and opened up.