ak diesel driver
6.5 driver
they are the 3 square dot ones and are brand new?
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how much would new precups be worth?
- Thread starter ak diesel driver
- Start date
3500GMC
What T F, over
It's worth what somebody will pay.
ak diesel driver
6.5 driver
it seems like I've read that new ones were pretty much unavailable. only some Chinese clones
If they are magnetic they are fake.... I have seen real GM cups for 60$ each new..
ak diesel driver
6.5 driver
3500GMC
What T F, over
Looks like a N/A cup. And they are N/A as well. 
ak diesel driver
6.5 driver
So what do you think a fair price on a set of 8 already ported to either diamond or performance would be?
3500GMC
What T F, over
To me, nothing if they weren't each CNC milled in a fixture.
ak diesel driver
6.5 driver
And I believe they would be.
Sent from my Studio 5.0s using Tapatalk
Sent from my Studio 5.0s using Tapatalk
ak diesel driver
6.5 driver
So I found these pics with dimension in an online catalog. Was wondering if they're accurate? If so the 6.2 cup is slightly bigger than the 6.5 one. I'm wondering if that's why some drive in/out and some are loose. I'm also wondering if these dimensions are accurate. Anybody have some lying around they would care to measure.
Attachments
turbovanman
I has boost, :O)
If they are machined properly, I'd be interested, I need some new one's when I install my GEP shortblock.
What's wow?
What's wow?
Never had a reason to mess with pre cups until now (maybe). Just got a long block GEP, Les do you think the cups from my 96 6.5 turbo engine will swap out if my GEP is a N/A cup?
Chevypoor
Active Member
I just swapped Diamond pre cups into my 93 6.2l heads. When I went to put them in one and just one was loose. With the head upside down it would drop in the socket and it had no movement side and did require slight pressure to install. As soon as I turned the head over it would fall out a couple seconds after I picked the head up. Removed all the diamonds and I tried all the 6.2 cups into the socket in question and guess what only one fit that hole. I noticed on the cups on the side there were markings and if I remember they were slightly different. I wondered if when GM machined the cup sockets to account for tool wear or tolerances maybe they had a range of cup sizes ( like maybe a 64th bigger or smaller than standard ) at the plant to account for this. 6.2 turbo suggested using Indian Shellac to glue the one loose one in to allow the head to assembled. Seemed to work fine and seemed like a better idea than buying sets of pre cups until I found that would fit.
ak diesel driver
6.5 driver
That one catalog was the only thing I've ever seen or read on them being different.
Chevypoor
Active Member
The ones I just swapped were my first experience with them and I was surprised to find one cup slightly bigger than the rest from the factory. I thought they were all the same size too.
Paveltolz
Доверяй, но проверяй
I've had one laying around for visual reference. It's an odd one being that it has two squares on the left side and big "T" on the right.
Measures 39.66 across the face, 22.06 in depth and 34/46 across the bottom.
ak diesel driver
6.5 driver
so far it appears as they aren't made very precisely
That is freaking huge.
I just pulled one of my cups and got messurments and pics, but I'l have to post them later.
