Re: Navarro aftermarket heads
Tony since you have a new set of heads and only one spark plug that's hitting a valve in cylinder number 8 that tells me that the spark plug hole in the head for that cylinder was machined deeper than the other seven.
Any cam with lift will at times require the spark plug be spaced out a bit so the valve will not come in contact with the plug electrode. There's only one solution to this problem. Add another spark plug washer to the plug. Since you only have one that hits add one spark plug washer to cylinder number 8.
Well there is possibly one more option return the heads to H&H and try another set.
Ronnieroadster
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"Life Member of the Bonneville 200 MPH Club using a Ford Flathead block
First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921
First Ford flathead roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH reset the record in 2024 to 211.830 running to mile four. Top speed 2024 mile five 220.672 exit speed 221.587
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