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1972 shovelhead engine needs spark plugs and oil!

I have a 72 shovelhead engine and I want to know what type of spark plugs can I use in it instead of harley davidson and also what would be the best oil to use in it instead of harley davidson also? About how many quarts would I put in it too? I think 4 but not sure. Thank you for your help!!

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I have a 75 FLH and I use the Bosch Platinum WR8DP if you have the long plug if you have the short one it is W8AP, they are an exelent plug. As for the oil I use Rev-Tech grade 60 but you should stick with one kind of oil and for a FLH it is 4 qts.

Posted on Jun 27, 2009

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If it were me, I would only use Harley ... However, you could use Champion or NGK, they make good plugs. The biggest problem I come across is the nipple that the spark cap snaps on to is removable on most aftermarket plugs and they always come loose and can cause problems. As for oil, Any good ranked 50 or 60w air cooled engine oil could be used. Harley's oil is rated up to 360 deg. I would look for an equivalent and stray from using synthetic oils.

Posted on Aug 10, 2009

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I own a 71 FLH and live in Florida. NKG plugs seem to work the best, the run hotter than most plugs, which is beneficial with low compression engines - 74ci. I also run octane booster and a little Marvel Mystery Oil to help with the lack of lead in newer fuels. As far as oil is concerned I have yet to find a better oil then Spector. I usually run the 60w in the summer due to the warm florida days, and 50w in the winter.
Hopefully this will help.

Posted on Aug 05, 2012

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I have a 72 shovelhead engine and I want to know what type of spark plugs can I use in it instead of harley davidson and also what would be the best oil to use in it instead of harley davidson also? About...


try this for your plugs - might give a couple of options. maybe a later one will do?
http://www.harley-performance.com/harley-spark-plug.html
Amsoil 20w-50? Depends where you are and what you can get. I think there is a rev-tech oil to suit your shovel, but can't remember the spec off hand. Havoline 20w-50? Oil debates seem to rage on forever on most H-D forums around the world. Have found for me the H-D stuff is about the same price as the rest, and just as good/bad as them.
As for quantity, I'm thinking it is about 31/2 to 4 quarts, as you said.
Check these guys out - maybe better answers than mine mate. http://www.shovelhead.us/
Hope this helps you.

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