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Title: FB engine welch plug size Post by: Fraze on December 28, 2014, 07:09:24 PM The two welch plug cavities behind the side plate on my FB engine measure 1.208" - the nearest "real" size is 1.218" - (1 7/32"). In my Holden master parts catalogue the size is listed as 1 1/4". Can any one throw some light on this discrepancy? Thanks Frazer
Title: Re: FB engine welch plug size Post by: weddo on December 28, 2014, 09:43:53 PM Frazer,
Only 1/32 difference. Put the welsh plugs in the freezer for a couple of day, your motor out in the sun for a few hours then tap then in regards Weddo Title: Re: FB engine welch plug size Post by: Fraze on January 07, 2015, 07:42:46 AM The correct welch plug for the FB engine (behind the side plate) is 1 7/32", contrary to what is shown in my GMH parts book. Cheers Frazer
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