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Home > Technical Chat > Dry Deck, K-head - Thread sizes

minimole23

4303 Posts
Member #: 1321
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Wiltshire

16th Apr, 2016 at 05:26:08pm

Turning my attention to preparing the block for the conversion, I was wondering if anyone had a diagram or list of thread sizes.

The Key one would be what thread size to go for for the rear water galleries that overhang the three head studs.

As for the rest of the waterways, and push rod holes I will probably just go for some allen head grub screws, probably metric as they seem readily available.

As far as re-drilling for the stud holes is concerned, there seem to have been various stories of wonky studs during home attempts. Is this a job best left to a machinist with a heavy duty pillar drill?

Cheers

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

Sprocket

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11046 Posts
Member #: 965
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Preston On The Brook

16th Apr, 2016 at 06:55:02pm

I used a combination of 1/8" and 1/4" taper thread plugs in brass and iron

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

Sprocket

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11046 Posts
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Preston On The Brook

16th Apr, 2016 at 06:59:03pm

Oh, and for the head studs a heave duty Bridgeport with an end mill rather than drill will get better results, but the threads can still scew depending on how the holes are tapped

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

Sam

1391 Posts
Member #: 1686
Post Whore

Oxford

18th Apr, 2016 at 11:47:38am

As for drilling. Dont use an end mill.

Spot drill.
Small twist drill
Slot drill
twist drill to size.

A bridgeport is an not a bad tool to do it on. You can align it correctly and put in the relevent grid pattern more accutately.

Ideally you want to forget using a jacobs chuck and use collets.

On 19th Feb, 2011 Miniwilliams said:
OMG Robert that's a big one


minimole23

4303 Posts
Member #: 1321
Post Whore

Wiltshire

18th Apr, 2016 at 07:35:25pm

Thanks both for the advice.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

Streetscreamer

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112 Posts
Member #: 10125
Advanced Member

Zoetermeer, The Netherlands

26th May, 2016 at 06:58:13pm

For metric fans: I managed to use M8, M12 and M14 in brass and cast iron (old cam shaft interior).
Glued with green Loctite

Edited by Streetscreamer on 26th May, 2016.


matty

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8297 Posts
Member #: 408
Turbo Love Palace Fool

Aylesbury

26th May, 2016 at 09:11:44pm




On 18th Apr, 2016 Sam said:
As for drilling. Dont use an end mill.

Spot drill.
Small twist drill
Slot drill
twist drill to size.

A bridgeport is an not a bad tool to do it on. You can align it correctly and put in the relevent grid pattern more accutately.

Ideally you want to forget using a jacobs chuck and use collets.


You missed off thread milling after the twist drill. *happy*

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