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03-13-2011, 02:25 PM | #1 |
Junior Member
Join Date: Mar 2011
Location: Chicagoland Illinois
Posts: 26
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Offenhauser head spark plug length
I have seen a number of threads on this issue and it seems the popular plug choice is the NGK B6L plug. That plug has a 7/16" reach, which may be fine for stock heads. My Offy 8BA-425 heads measure 1/2" from the plug seat to the inside of the chamber, so wouldnt a spark plug with a 1/2" reach, such as the NGK B6HS be a better choice? Its still the same heat range, 14mm thread, non protuded tip, non resister as the NGK B6L.
Bill |
03-13-2011, 04:27 PM | #2 |
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Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,862
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Re: Offenhauser head spark plug length
I can't answer your question but I do have an Excel Spread Sheet/Matrix that gives all NGK plug numbers and all sorts of tech info for each pn, such as reach, etc. It also compares NGK to other well known plug manufactures and their plug numbers. I could email you a copy of this if you PM me your addy.
ps...one thing I failed to mention was I'm using the NGK B6L plugs in my Offy heads on my 59 engine. I chamfered a little material away inside the chamber at each threaded plug hole until the reach was right for the B6L's. Then I CC'd the chambers to make sure they were all the same. I'm not necessarily recommending that you do this but that's what several folks suggested that I do when I asked the same question. Maybe some of the engine building gurus here can comment more on this.
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 03-13-2011 at 04:55 PM. |
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03-13-2011, 04:31 PM | #3 |
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Join Date: May 2010
Location: Columbia, SC
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Re: Offenhauser head spark plug length
Don't know the exact measurements, but I've had good luck with Autolite 437's in my Offenhauser heads.
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03-13-2011, 04:38 PM | #4 |
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Join Date: May 2010
Posts: 893
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Re: Offenhauser head spark plug length
All flatheads with 14mm plugs were in the old days H10 why would we not use these. The champion replacement is H10C. They are available and I have some coming on Monday. They will be going into eddie meyer heads.
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03-13-2011, 04:57 PM | #5 |
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Join Date: May 2010
Location: Near Rising Sun, Maryland
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Re: Offenhauser head spark plug length
New Champion plugs have received a lot of bad press after they moved their manufacturing to Mexico.
__________________
John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein |
03-13-2011, 07:54 PM | #6 |
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Join Date: Mar 2011
Location: Chicagoland Illinois
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Re: Offenhauser head spark plug length
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Bill |
03-13-2011, 08:37 PM | #7 |
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Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
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Re: Offenhauser head spark plug length
I just used a set of ATL414 autolights in a new set of Offy 400 heads, 1/2in reach same heat range as H10 or 216 autolight. Walt
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03-14-2011, 04:24 PM | #8 |
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Join Date: May 2010
Location: Yucaipa, CA
Posts: 1,112
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Re: Offenhauser head spark plug length
Here is a link to the H.A.M.B site about the plug length for Offenhauser heads
http://66.154.44.164/forum/showthread.php?t=365381 |
03-14-2011, 05:47 PM | #9 |
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Join Date: May 2010
Location: new zealand
Posts: 1,054
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Re: Offenhauser head spark plug length
i had to champer out around the plug hole as the tips of plugs didnt go right through this was on a new set of edelbrocks
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