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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!
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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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