ShopTalk Forums | Aircooled VW Tech & Restoration Help

I'm building a 2.7ltr engine and would like advice on adding more studs (5 or 6 ?) to the cylinders and heads. I've looked at some of the 5 stud configurations and can't see the advantage of the 5th stud just above the spark plug hole. I haven't sen any 6 stud configurations, do they use 6? Looks like the head fins would flex before adding and additional holding. Any advice would be appreciated. Thanks Mike

Moss64C wrote:I'm building a 2.7ltr engine and would like advice on adding more studs (5 or 6 ?) to the cylinders and heads. I've looked at some of the 5 stud configurations and can't see the advantage of the 5th stud just above the spark plug hole. I haven't sen any 6 stud configurations, do they use 6? Looks like the head fins would flex before adding and additional holding. Any advice would be appreciated. Thanks Mike

Significant additional material is welded into the heads where the studs go (And on the jugs before they are bored)... It's not remotely a simple 'drill it/add more studs' operation.

I have a 2.6 with six stud per cylinder. The 5th and 6th studs are 5/16" bolts. Brothers Machine shop or FAT Performance can provide this service.

http://www.desertrides.com/forum/downlo ... p?id=18079


http://www.desertrides.com/forum/downlo ... p?id=18076

http://www.desertrides.com/forum/downlo ... p?id=18077

http://www.desertrides.com/forum/downlo ... p?id=18078

Thanks for the photos. They explain a lot. Where is Brothers Machine Shop located? Thanks Mike

Moss64C wrote:Thanks for the photos. They explain a lot. Where is Brothers Machine Shop located? Thanks Mike

Ontario , Ca . 909-947-6001 they do awsome work!

Nice pictures and very nicely done!

Did it stop the head leaking?

Yes. Fat only has five studs on their engines but Brothers will install a 6th stud. When you get into anything over a 4" bore it’s hard to stop leaks on a VW engine.

What's the approx. cost on a 6th mod ?

I have just bought some parts from an old Mark Stephens failed project from years past.

103MM jugs and slugs
2.0 914 heads, stock , to be c'bored for 103's
relieved case
mod'd rods
DPR 78.4mm knife edged and balanced crank
Deep sump

Have to make a cam selection, playing with desktop dyno now

was thinking that a 5th or 6th stud set up would be the way to go as long as I'm not far along.

Any inputs and comments welcome!!!!!

Dick

Wow, there is a name that I havent heard in a while. Anyone know what happened to MArk Stephens??
The 5th stud is to prevent the head bow between the studs, even a 1/4dia stud will help. The sparkplug area on a bus head is way thin.
You have 914 2.0 heads and in my opinion they may not need extra for a mild engine. I ran a 103x71 for 13 years with 10.25:1 comp and it never leaked. With bus heads. YMMV

what are you putting this engine in?
I used a c35 scat cam in mine and it pulls forever. If you want big I have a ran for 3 hours webcam 86b/c small base circle that is for sale.

I have a pair of 914 2.0 6 stud heads done by M. S. that are in my swap meet box. bored the "103"std., 44x 38, never used. They have all the mods.

I told a pretty good story and it may still be in the archives here.

So you are going to sell them? I wish I was working.

I found the story Tom, pretty much what I heard .I lost a pallet of 30 heads in the mess. Wish I had them today now that I have a seat and guide machine.

Morning,

Not tring to hijack the thread, just piggy back on the studding info!

I am dropping it into a 914 that I picked up that has a FAT prepared 2.1L that was started 11 years ago, kid had no oil pressure. Turned it off to garage it till he got back to it and left for a job in Japan. Got it for a song!

Tying to decide on my options for dropping the Mark Stephens parts in with a lot of fore thought

Thanks Dick

Tom, I just found your site this weekend and have been working through it. Great info!!!!

I'll have to look at your heads and look for the story!

Dick

so to revive an old question, what kind of coin are we talking for 6th stud work, case only?

This bugs me so I'll fix it with the actual Pics...






Here's something I came across and have been considering. Now depending on crank strokes and rod lengths, I kinda like this better, and even have a couple of ideas for improvements. And no case welding required. And won't even mention the extra cooling.