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19Fordy · 07-10-2021, 03:51 PM

37: Thanks for the feedback. That FR4 Plug has a 3/4 inch reach which is good.
On my 239 cu. in 8BA with Motor City Flathead early style heads. I am using NGK VR4 2635 plugs that also have a 3/4 in. reach. Also running a 390 Holley with #51 jets.
No problems. Wonder how "my" plugs would work in your engine.

Take a look at this video and see if it might help you. I replaced the slotted screw with an allen head screw so it can be adjusted with the Holley carb on the car.
https://www.youtube.com/watch?v=b8ROjrGAH2I

07-10-2021, 03:51 PM	#19
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 11,925	Re: Holley 390 CFM Accelerator Pump 37: Thanks for the feedback. That FR4 Plug has a 3/4 inch reach which is good. On my 239 cu. in 8BA with Motor City Flathead early style heads. I am using NGK VR4 2635 plugs that also have a 3/4 in. reach. Also running a 390 Holley with #51 jets. No problems. Wonder how "my" plugs would work in your engine. Take a look at this video and see if it might help you. I replaced the slotted screw with an allen head screw so it can be adjusted with the Holley carb on the car. https://www.youtube.com/watch?v=b8ROjrGAH2I Last edited by 19Fordy; 07-10-2021 at 03:57 PM.