Head studs?

[Gazzab]

Numpty question....I need to send my head studs off to the machine shop so as to allow them to ceramic seal the block.
Here's a pic of some of the bits pieces I have in the box o bits... Can anyone confirm which of these are the head studs - there are various lengths, mixed numbers (4, 5, 6 etc), one doesnt have the point that the other 3 have etc...
Just dont want to send the wrong thing or too many things or miss that somethings missing or that something isnt quite right etc...
Thanks!

[mikesr]

There is a pic in the engine build manual that gives the stud lengths.

The outer ones are all 50mm - 8 per head

The inner larger ones are 4 different sizes

Per head
2 x 90mm
3 x 135mm
2 x 125mm
3 x 168mm

In your pic there are 5 very short studs in the top right tray. I reckon these are the ones for the sump.

The large studs are in sets of 6 and 4 so they must be the large head studs

The bottom right tray has 21 studs but the heads only need 16 so there are 5 extras from somewhere.

I think they may be the studs for the front cover. In my pics there are 10 of them - 5 on the block and 5 on the sump

None of the head studs are metric but the sump and front cover studs are.

HTH

Edited by mikesr on Saturday 10th March 12:58

[Gazzab]

Thanks for taking the time to give such a comprehensive reply!!
So I reckon that all the top left, all the bottom left, the large ones from top right and the 16 from bottom right. This must constitute all the head studs.... The timing cover and sump aren't needed just yet.
I assume the 4 spacers from top right aren't required yet either...!
Sorted! Thanks

[mikesr]

Happy to help.
I know what its like with an AJP in pieces wanting to get it rebuilt and back in the car.

The spacers will be the locating dowels for the head gaskets that fit around 4 of the studs.

[Gazzab]

Cheers Graham. Nice copper gaskets btw. :-) Is that a 4.8 I spy :-)

[Gazzab]

And some paintshop to cover the crowns... :-)

[Gray_101]

Remind me at chatsworth, and i ll show you the un edited photos and the NASCAR race pistons

[jackwibble]

Yep i think you need a better paint brush Graham you made a proper mess of painting those piston crowns, i didn't realise they were CIA super secret items

[Gray_101]

jackwibble said:

Yep i think you need a better paint brush Graham you made a proper mess of painting those piston crowns, i didn't realise they were CIA super secret items

Yeah I know ,, I'm rubbish

Where's spongy or scotty when you need them ? There painting skills are second to none

[itiejim]

Nice to see an AJP in bits again

What's the score with the 4.8 conversion and the copper gaskets then? Presumably it's just a rebore? Who's supplying these and what's the damage?

I imagine that the copper gaskets need wiring?

[jackwibble]

Wow Graham will not divulge such info on open forum if you can't see the limited edition of 16 Nascar super secret piston crowns you will never get him to talk about the rest of the re-build

[itiejim]

Just had another thought about this Gaz.

Presumably you're doing this to solve a porous block? If the whole block is being dipped or something and they've asked for the head studs it's probably to stop the threads being treated - in which case you really want to block any open threaded holes - just worth checking with them first as it might save you chasing the threads out later.

[Gazzab]

itiejim said:

Just had another thought about this Gaz.

Presumably you're doing this to solve a porous block? If the whole block is being dipped or something and they've asked for the head studs it's probably to stop the threads being treated - in which case you really want to block any open threaded holes - just worth checking with them first as it might save you chasing the threads out later.

Umm no idea... :-( Russ from race proved asked me to send the studs...no idea why, what etc !!

[Gazzab]

Agghh - They have received the head studs but (doh) they also need the nuts....
I am not at home but does anyone know which nuts they will need?
They have the block, heads and crank (afaik). They need the nuts so they can do the ceramic thing.... I just dont know what size, type, number etc....
thanks

[anonymous-user]

Question,

What is this ceramic sealing for and is it worthwhile? Im pulling a 98k 4.5 for a rebuild, is this treatment worth it while its out anyway?

[Gazzab]

No idea ...! It's at chessman engineering... I suspect it's to stop the porous issues that often impact ajp's as far as I know...
But I could be wrong...!

[Smithies]

Hi, could be wrong but thought ceramic treatment was flushed trough the coolant system to stop Leaks. Like a rad weld. I'm in the same situation as you steve. 4.2 is on the bench, so would be interested in more info?

[Gazzab]

Yeah I did some googling and that's what it seems to be! I suggest you might try chesman engineering? I might find out more via Russ at Raceproved...

[Gazzab]

anyone know the situ with nuts?
There appear to be 18 for each head? 10 main ones and then 8 outer ones?
I am not sure whats what from all the boxes of bits :-(

[Gazzab]

Maybe 10 of the larger bolt shaped nuts (!?) for each head - 5 short and 5 long and then 8 'kaylocs' (?) which I assume are just like threaded nuts in a hat shape?
Cant see any additional washers mentioned in the manual...?