Thanks, John, for your input. I installed the plugs several years ago. They are holding up. My '64 Newport was a project car, to be sure my 300E would get the best equipment and parts. I am not going for points. But, I am a believer in doing what is right in my restorations. Can you send me a source where I can get the correct plugs? Best, Ron Kurtz E #292 -------------------------------------------- On Sat, 10/21/17, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote: Subject: Re: [Chrysler300] 413 Welch plugs To: "Ronald Kurtz" <mark6268@xxxxxxxxxxxxx> Cc: Chrysler300@xxxxxxxxxxxxxxx, "Ray Jones" <1970hurst@xxxxxxxxx> Date: Saturday, October 21, 2017, 8:17 AM I think to do this right you have to machine the block to remove the lip the flat stock discs sit on . Just putting GM style cups in the holes does not work correctly . They need to go in flush all the way . Maybe you did this machining? If not they will not grab as designed .precision size of hole too ? I am a big believer in the hot heads aluminum plugs held with a stainless steel bolt and toggle bolt like strap . This cannot come out . The bolts from hot heads are slightly too short aggravating putting them in , unbelievably so , inside parts can drop into water jacket . You are done for . I had a bare block got the toggle bar out of top of block. Get 1/4 longer bolts . Made for 392 , may be same size as B , and a bolt in . The o ring sits on the block lip. Which must be clean . lost a disc one on first trip on 392 ,huge hassle you get 2 minutes to boiling in head. very tricky to get in right with stock , but stock works. A skill issue . No one does this in 2017, they do not have the experience . But stock rusts too . On heads maybe cups are a good answer ? Machining them anyway at a rebuild. Bottom line hot heads bolt in plugs end this problem on block. And can be done without machining . Need to check if 413?and 392 same size . A good machinist can make this too . John G Sent from my iPhone > On Oct 21, 2017, at 5:41 AM, Ronald Kurtz mark6268@xxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: > > Copper cup plugs are available from Summit Racing . I installed them on my '64 361. > > Best, > Rom Kurtz > E #292 > ------------------------------------------ > On Fri, 10/20/17, Ray Jones 1970hurst@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: > > Subject: Re: [Chrysler300] 413 Welch plugs > To: "Richard Vitek" <rpvitek@xxxxxxxxxxxxx> > Cc: "Intl 300" <Chrysler300@xxxxxxxxxxxxxxx>, "Ray Jones" <1970hurst@xxxxxxxxx> > Date: Friday, October 20, 2017, 11:27 PM > > > > > > > > > > > > > Not sure why you want > to use disc rather than cup plugs. Cup plugs are more > foolproof, and are easier to set and keep in place. > Back in the day when I replaced > any of mine, I used Marine Brass cup plugs.413 is a very popular > engine, so they should be readily available, in steal or > Brass. > > On Fri, Oct 20, 2017 at > 3:47 PM, 'Richard Vitek' rpvitek@xxxxxxxxxxxxx > [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> > wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > Anyone know of a > good source for Welch plugs (expansion/freeze/core),( disc, > not cup type,) for an early 413? Counterman at NAPA and some > other stores unable to help. > Thanks. By the way, are > these sized nominally the same as the cup type for the same > size bores? > > > > > > > > > > > > > > > > > > > > > > > -- > Ray > Jones. Y'all come on down an see us. 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!important; > } > #yiv5198087909 > > > > ------------------------------------ > Posted by: Ronald Kurtz <mark6268@xxxxxxxxxxxxx> > ------------------------------------ > > To send a message to this group, send an email to: > Chrysler300@xxxxxxxxxxxxxxx > > To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or > go to https://groups.yahoo.com/neo/groups/all/manage/edit > > For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm > > For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang > ------------------------------------ > > Yahoo Groups Links > > Traditional > > > > Chrysler300-fullfeatured@xxxxxxxxxxxxxxx > > > ------------------------------------ Posted by: Ronald Kurtz <mark6268@xxxxxxxxxxxxx> ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to 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