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 Post subject: ARP head stud kit
PostPosted: Fri Apr 05, 2019 7:11 am 
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Hi all I'm just wondering if any one knows the part number for the 11 stud ARP kit is?


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 Post subject: Re: ARP head stud kit
PostPosted: Fri Apr 05, 2019 4:55 pm 
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Joined: Mon Jan 12, 2015 10:59 pm
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Location: Holt ACT
BMC A-series, 11 studs Kit #: 206-4204

Found by Googling


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 Post subject: Re: ARP head stud kit
PostPosted: Sat Apr 06, 2019 11:39 am 
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Location: Wodonga - Vic/NSW border
DavidE wrote:
BMC A-series, 11 studs Kit #: 206-4204

Found by Googling


confirmed by looking at the number on the box in my shed...

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 Post subject: Re: ARP head stud kit
PostPosted: Fri Jul 05, 2019 9:39 pm 
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As an interesting aside on the use of ARP studs ... but let me say first I do use them and generally they are lovely quality.
The cost of building minis is getting astronomical, and I certainly don't believe you need all those so called fancy bling bits.
BMC made some bolts of excellent quality, and they are probably free for you as you already have them. For cylinder heads, I do prefer studs instead of the bolts, but you can make yourself a little test rig (not 100% perfectly scientific) where you can test what bolts you have by the stretch test. You could pass a stud through an old cylinder head, or rocker posts, fit a 3/8 UNC nut and washer at the coarse end, then a head nut and proper hi tensile washer, and some lube at the fine end and tension it to 45 ft/lb. The only problem is you need some verniers or preferably micrometer to measure the length before you started and after tightening to see how much it stretched. ARP bandies around .005" on conrod bolts, so maybe more on head studs. I reckon you will be surprised how good genuine BMC can be ... They didn't have chinese steel way back then !!!!! just saved you another $200 LOL
Cheers Lindsay
BTW, those 2 bolts that hold the early oil filter housing are not HI Tensile, look a bit chromy / plated and will break if you use then as head studs (and thats usually as you tighten the last nut).

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 Post subject: Re: ARP head stud kit
PostPosted: Sun Jul 07, 2019 8:58 pm 
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Hi, I am going to add to and clarify my comments on bolts. One of the very experienced gurus who does a lot of engines currently, rang me this morning and we chatted about bolts and head gaskets, and they partly lead into each other.
The bolts that I specifically think BMC got pretty correct are the cooper S studs, which appear on a lot of 1275, and have a very clear dot punched into the top fine end. There are others, but they are quite scarce, but the other issue that I had not given enough thought to is the quality of the threads, hi tensile nuts, and stud washers that should also be hi tensile.Do not use bunnings nuts and bolts they will fail
The fact that the whole package is important probably means that in many cases better quality items need to be bought.
The only company that seems to offer a lower priced alternative to ARP that we know works is minispares who have a few part numbers.Post if there are others
This does lead into head gaskets as I have seen a number of small bore head gaskets fail in Victoria, and it seems to be common elsewhere. One cause is head gasket quality, as ACL who made great gaskets in Australia don't exist.
Another definite cause is bolt or stud quality, so a bolt upgrade will help.
The other pests in the room are mechanics ability ( minefield ahead) technique, machining, quality of the tools used and tuning (includes cooling system) ...so it is a complex subject.
Perhaps some gurus can start a post on cylinder head fitting do and donts, and we will see how they vary and who can help us all. I have my thoughts having had an engine parts specialist business, and mini businesses, but can always learn
Lets hear your thoughts cheers Lindsay

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1960 A40 Farina
1964 Group N mini
1964 supercharged 12.5 sec 1/4 mile moke
1965 Mk1 Cooper S
1970 Colt 1100F SS
2002 Mini Cooper S supercharged race car
2014 Mitsubishi Imiev fully electric


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 Post subject: Re: ARP head stud kit
PostPosted: Sun Jul 07, 2019 10:52 pm 
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Location: Wodonga - Vic/NSW border
I don't have any special dos and don'ts, except that on the rare occasion I change a head gasket that I always clean the block and head surfaces with an oilstone to remove any high spots. I clean them within an inch of their lives.... I did a gasket change for a local guy here who'd bought a rebuilt engine from a 'specialist' and it had needed a couple of gasket changes since he got it. I oilstoned the head and found a very large 'channel' in the head face that had burnt through and I assume eroded away the metal. It might have started out as a scratch but was a couple of millimeters wide when I found it. The head was resurfaced and refitted, no issues since

On head studs, I've actually only ever used original BMC studs, even with 13psi of boost - the ARP set I have is in the box on the shelf, I'll use them next rebuild

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 Post subject: Re: ARP head stud kit
PostPosted: Sun Jul 07, 2019 11:03 pm 
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Location: Brandy Hill, NSW
What are the origin BMC part numbers for the head studs?


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 Post subject: Re: ARP head stud kit
PostPosted: Mon Jul 08, 2019 12:33 pm 
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I found the late Clubman 998 head studs with the flange nuts are very strong too. These studs have a wide chamfer on the top.

Re 'ARP' 1275 S type rod bolts, the asking price for these is becoming ridiculous here. Some places want $300+ a set.
I have used ARP's Ford FE 'big block' rod bolts, the same material and length.
You get 16 bolts and nuts for around $120. Plenty good for fast road motors.
Fit straight in. Different head, but they fit.
P/No 155-6002.

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