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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2018 Posts: 473 Shop Shark | | Shop Shark Joined: Dec 2018 Posts: 473 | Pulled No. 2, No. 8, No. 3 and No. 7 plugs to check condition. Nice dry brown haze with no electrode burn back. Checked gap all 4 plugs .045" factory setting?
Question, is this an acceptable gap for a 350 cid sbc? .035" comes to mind. Seems a bit on wide side. HEI ignition.
| | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | .035 was the conventional setting for many years, that is until HEI came along and the gap was increased. ðŸ›
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Dec 2018 Posts: 473 Shop Shark | | Shop Shark Joined: Dec 2018 Posts: 473 | | | | | | Joined: Feb 2016 Posts: 1,989 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,989 | .045 - .060 gap for HEI, depending on application AND plug, I would say .045 is a good place to start. I can't remember if it was my 1974 1/2 ton 350 or my 1976 3/4 ton 350 that was stock .060 gap
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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