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Old 09-16-2018, 05:01 PM   #1
Patch
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Good shorty spark plug?

Was wondering if any of you are running the A/C Delco shorty plugs? Anyone using anything else? Pretty much a stock 350-4 with converted HEI and headers. Thanks!
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Old 09-16-2018, 06:29 PM   #2
morepwr
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Re: Good shorty spark plug?

I am using Autolite 303 plugs on mine since I needed a little more spark plug boot clearance on my headers. The are roughly 3/8" shorter than the A/C ones I had before and give a little bit of space between the header and spark plug boot. I know there are others that are shorter if that isn't enough for your application. I think Accel makes short spark plugs just for tight header applications. Also the 303 is for a flat seat cylinder head and I am not sure the number for a tapered seat head.
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Old 09-16-2018, 11:53 PM   #3
OregonNed
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Re: Good shorty spark plug?

I use the short Accel ones - they work great for me - (headers plus the truck runs great)
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Old 09-17-2018, 06:55 AM   #4
50procharged
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Re: Good shorty spark plug?

Ngk yr5
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