74 225 Slant 6 Spark Plugs

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Holden Customs

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Joined
Jul 10, 2019
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Hey everyone,

I am looking for recomendations for what plugs to use in my 74 slant 6. I looked at some other posts and found that there are 2 types of heads, one with plug tubes and one without and was confused as to which plugs work with what. I have included a picture of my head for reference, but I am pretty sure mine doesnt use the aluminum sealing tubes. I have ordered two sets of plugs already and they both use the 13/16 socket size which is too large to fit. Any help is appreciated.

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i use ngk ur5 they also have ur4 and 6 depending on what heat range you like. Since you have the peanut head you need to run a tapered plug
 
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