correct gap for spark plugs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

profe56 · 01-24-2016, 06:45 PM

Hi folks:
I already bought a set of ac delco spark plugs 41-905 19301809.
what would be the correct gap for a 305, 84, 4 barrels.
or are they already to be installed?

thank you

**'68OrangeSunshine** · 01-24-2016, 06:59 PM

.045 is the standard gap for plugs w/HEI.
Never assume plugs are "pre-gapped'' even if they are advertized as such. They get bounced round a lot in shipping. It's best to KNOW what your plug gap is by doing it yourself.

01-24-2016, 06:45 PM	#1
profe56 Registered User Join Date: Nov 2008 Location: Chula Vista California Posts: 526	correct gap for spark plugs Hi folks: I already bought a set of ac delco spark plugs 41-905 19301809. what would be the correct gap for a 305, 84, 4 barrels. or are they already to be installed? thank you

01-24-2016, 06:59 PM	#2
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,536	Re: correct gap for spark plugs .045 is the standard gap for plugs w/HEI. Never assume plugs are "pre-gapped'' even if they are advertized as such. They get bounced round a lot in shipping. It's best to KNOW what your plug gap is by doing it yourself. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.



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