fitted ARP studs to my 3.9 V8 today.

**101RRS** · 13th August 2012, 02:43 PM

Originally Posted by MacMan

I'm not sure why you're so against reusing the big end hardware. They should be fine to go back in as is.

In my previous engine rebuilds (Subaru 1800, LR 2.25 and Honda 550F) I have reused bolts but the consensus seems not to reuse them. With the big end the heavy forces are downward when the engine fires so not against the big end bolts so I can understand old bolts being suitable but the prevailing opinion is not to reuse (particularly if they are cheap).

I am open to suggestions and will make a decision based on that - there is no rush as I need to wait for stock of the studs to come in, in a few weeks.

So I take it that you think they are OK.

Thanks

Garry

**clubagreenie** · 13th August 2012, 03:47 PM

If you ID the threads and sizes then send an enquiry to ARP they will advise if they have what you need in stock and will probably be able to make up a kit for you. From that they usually add it as a stock listing with a new number as it how they often get the info for some of the less mainstream stuff.

Big ends are fine with a bolt or the original hardware, as said it's an opposing force.

**MacMan** · 13th August 2012, 04:56 PM

Yes, I believe reuse is fine. I reused mine, along with the main bolts.

Bear in mind that if you are replacing them, have them in hand before you send everything off for balancing because they will play a part in the equation.

**clubagreenie** · 13th August 2012, 05:38 PM

Actually on the ARP website is a form you can download and print to ID the studs you want and send back. Has all the info they need. Keeps it simple.

**101RRS** · 13th August 2012, 08:08 PM

Thanks for those comments - will run with the used big end bolts.

**PhilipA** · 14th August 2012, 04:12 PM

My 3.9 has now done about 20Kk now with no problems and virtually no water usage.
I noted the short coarse threads in my original post , but doesn't seem to have caused a problem at 80Ft lbs.

Regards Philip A

**Hoges** · 17th August 2012, 01:08 AM

ARP have now developed a specific head stud kit for the 3.9/4.0/4.6 10 bolt Rover heads.

Relevant information received from ARP is as follows:

"We have a head stud kit now for the 10 bolt heads, 3.9L~4.6L Rover V8. The part number is 157-4301, it is available.

Main stud kit 4.0L~4.6L 157-5401
Or
Main bolt kit 4.0L~4.6L 157-5001"

From a search of rangerovers.net I had discovered that ARP had written to one of the forumites there last year indicating they would get hold a 4.6L Rover engine block and develop a kit for it. This they did and as the result of an email I sent them a couple of days ago the above response was received.

Cheers

Hoges

**MacMan** · 17th August 2012, 09:00 AM

I gather that kit will have longer threads inserted into the block. So long as there is no chance that they touch down at the bottom of the block holes, extra engagement can only be a good thing.

Just a bugger that it didn't happen 4 months ago, but Murphy looms large in my life at the moment

**101RRS** · 17th August 2012, 01:05 PM

I just contacted Fabre and got them to change my order to the above part numbers but the ARP catalogue still does not list them.

**Davo** · 17th August 2012, 03:27 PM

Poop. I got the older kit just a few months ago.

Thread: fitted ARP studs to my 3.9 V8 today.

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