Manifold studs on twin cam

[Wee-Chris]

Can anyone tell me what size the manifold studs are on the twin cam engine.

Want to replace them whilst engine out.

Thanks

[john.p.clegg]

You'd be better off heli-coiling the head and fitting allen screws...makes an awkward job that much easier..

John

[Wee-Chris]

Might be an idea to that.

Never helicolied anything before.

Any idea what size original studs are anyway?

[robertverhey]

5/16 UNC but not sure why you'd helicoil unless there's something wrong with current threads.....

I got a set from Basil's bolts in UK, bought a crossflow set and asked him to add two and adjust price

http://www.ebay.com.au/itm/FORD-CROSSFL ... 511&_uhb=1

[Wee-Chris]

Thanks

Threads are fine in head. Couple of studs a bit ropey, that's why I thought I would change them while engine out.

My mates got a mini restoration business and has a stock of different studs. I plan to borrow some tomorrow, we'll take some.

Forgot to check, how many will I need?

[alexblack13]

Hi ,

The helicoiling idea is quite good. But generally only done if the threads are damaged. I almost did the mod the last time my engine was out but decided against. I do wish I had gone ahead though. The benefit as John said is that it makes fitting the manifolds so much easier to do.. AND you can put a little extra torque on the fasteners too if you wish / need too. Helicoils will take 1.25 x the st'd torque normally.. Check with manufacturers but 'recoil' for eg are ok with 1.25....

If you decide against .. Test fit your new studs and clean (airline?) out the holes Check the manifold lines up perfectly but don't fit your studs just yet. Wait until the motor is in and the manifold is in place, then screw the studs (with double nuts fitted to screw them in tight) through the manifold fixing holes. Way easier then trying to get the manifold into position with the studs in place...

Just MHO by the way. This is the way I do it.

Good luck and have fun with it..

Alex B .....

[alexblack13]

You will need 8 studs...

AB

[john.p.clegg]

5/16 UNC but not sure why you'd helicoil unless there's something wrong with current threads.....

I got a set from Basil's bolts in UK, bought a crossflow set and asked him to add two and adjust price

http://www.ebay.com.au/itm/FORD-CROSSFL ... 511&_uhb=1

Those look just like 5/16" UNC

Aren't they 5/16" UNC/UNF ?

John

[robertverhey]

Oops my bad. Wasn't basil (though his would do the job), was dougie1974 on eBay. Doesn't seem to have any imperials listed at the moment, but was the same as this style, with brass nuts and 5/16 UNC/UNF. Might be worth asking him, he may have them, despite them not being listed

http://www.ebay.com.au/itm/PINTO-M8-MAN ... 2ece68c1e7

[elanner]

Burton sells them:

http://www.burtonpower.com/stud-exhaust ... fl840.html

0.88p each.

And the nuts:

http://www.burtonpower.com/exhaust-bras ... b516f.html

0.78p each.

Nick

[alan]

put copperslip on threads going into head

[Wee-Chris]

Can engine go back in with manifold on?

Can't remember when I took to bits.

[alan]

put manifolds in engine bay and hold to one side with string or something.
Then with manifolds in bay lower in engine with head on but no exhaust studs fitted

[john.p.clegg]

put manifolds in engine bay and hold to one side with string or something.
Then with manifolds in bay lower in engine with head on but no exhaust studs fitted

I'd hate to try to put the manifold studs in with the engine in place,it's difficult enough trying to get the manifold onto the head whilst in the engine bay..

John

[alexblack13]

It isnt difficult John..Try it!

Make sure the manifold holes all line through though..Other wise it will be a PITA...