Exhaust manifold bolts

[number 7]

Are they 3/8" UNC, is it worth changing to ARP bolts which I have seen mentioned with a smaller head (if so, where are they available?) or has anybody used studs, although I'm not sure if there is suficient clearance for this to work?

Cheers.

7.

[honourablepickle]

k bolts are much simpler to do up than the large headed normal bolts , i think the arp ones are torx style bi hex heads , if i remember right studs are no good with the wedge manifolds
people like rpi should have arp stuff
have fun
hp

[GreenV8S]

The ARP k-head bolts that are recommended are 3/8 hex heads. These are much easier to get in than the original 14mm hex heads, and there's room to get a ratchet ring spanner on most of them. That makes the job a heck of a lot easier. I don't think there's room to use studs on most models because there isn't enough space to get the manifold over the end of the studs.

[adam quantrill]

number 7 said:

where are they available?

Me too

Edited by adam quantrill on Monday 26th March 11:44

[GreenV8S]

adam quantrill said:

number 7 said:

where are they available?

Me too

Edited by adam quantrill on Monday 26th March 11:44

RPI, Real Steel, TVR Car Parts, I'm sure most RV8 and TVR specialists will stock them.

[adam quantrill]

Ta - I'll check.

GreenV8S said:

I don't think there's room to use studs on most models because there isn't enough space to get the manifold over the end of the studs.

I'll second that - you need to get the studs out to remove the manifold.

How about this: when I found that one of my manifold bolts had had it's thread stripped, stuck in a new longer set screw that was about an inch longer. This sticks out past the manifold. On the set screw is a nut. After you've screwed the set screw in, you can use the nut to clamp down the manifold.

It looks a bit strange because you still have this bolt head sticking out, but it does work. And it might be the best of both worlds - the strength of a stud, with the removeability of a bolt.

[Bomber Denton]

I've got my manifolds off at the moment and I bought a set of ARP bolts from ACT, offered on up today to a couple of the threads and they do seem to catch and thread much easier. Second what GV8S says about the ratchet spanner getting the original studs out was a bit of a pain but dropping the stud head from a 14mm to a 10mm is a real bonus.

[wedg1e]

adam quantrill said:

How about this: when I found that one of my manifold bolts had had it's thread stripped, stuck in a new longer set screw that was about an inch longer. This sticks out past the manifold. On the set screw is a nut. After you've screwed the set screw in, you can use the nut to clamp down the manifold.

It looks a bit strange because you still have this bolt head sticking out, but it does work. And it might be the best of both worlds - the strength of a stud, with the removeability of a bolt.

So what you're saying is... instead of removing the head and performing a thread repair, you've ...erm... what's the phrase... bodged it?