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Mod | | | Forums66 Topics128,080 Posts1,055,953 Members48,430 | | Most Online14,466
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: Feb 2006 Posts: 649 'Bolter | | 'Bolter Joined: Feb 2006 Posts: 649 | I just aquired a 61 235, thats going into my 51 Burb. I've install an HEI dizzy out of a 69 250, and I'm wondering what spark plug works best with HEI. Should I stay with the recommended plug for the 235? Or maybe go with the 250 plug? Thanks in advance. | | | | | Joined: Sep 2007 Posts: 461 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 461 | With a 235 head, I would go with a 235 plug. | | | | | Joined: Nov 2005 Posts: 238 Shop Shark | | Shop Shark Joined: Nov 2005 Posts: 238 | Spark plugs for HEI ignition usually have an internal resistor. I understand that the resistor is there to increase the reliability of the electronics.
Stuart. | | | | | Joined: Mar 2005 Posts: 98 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 98 | the resistor is there to suppress radio interference, which can damage the ignition module and be annoying if you have a radio in the truck
50 chevy 3100
| | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | When I installed Langdon's HEI in my 235 I asked Tom about that, he said just use the normal plugs but open the gap up to .050" to .055" | | | | | Joined: Jan 2007 Posts: 83 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 83 | I have about 500 miles on a set of NGK BR6S plugs. Once I got the gap opened up I have had no problems so far. FYI McMaster-Carr sells a split clamp that works great for clamping the dist down part number 6436k73
Hope this helps.
Jason | | |
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