Precups now available

[Nero]

CDD started selling precups, so thats fun.

6.9 & 7.3 IDI Prechambers

With the age of these engines, most 6.9 and 7.3 IDIs have severely cracked prechambers and will need to be replaced. We have manufactured a new prechamber for both engines, which follows the factory design, using a new alloy mixture which will be more resistant to cracking than the original...

classicdieseldesigns.com

 

[Olds64]

Excellent! Now that there's a source for the pre-cups I suppose machine work will be easier. I don't even know how much you can take off the heads without effecting compression excessively.

 

[8769bigred]

I noticed their description says that the heads need machined after install. Ford allows for a +\- .0025 protrusion or recession. I just swapped some cups from a junk set of heads to my heads recently. The cups sat almost completely flush. I would think you could swap cups without needing to surface the heads if you fell within the tolerance. Maybe these ones are manufactured to slightly different tolerances

 

[Nero]

0.0025 is pretty small, but I could see how it could possibly cause a leaking head gasket issue, espeially on these high compression ratio high psi engines.

 

[rreegg]

wow 1476 units in stock!

 

[IDIBRONCO]

wow 1476 units in stock!

Probably not for long!

 

[Nero]

Probably not for long!

But thats 369 heads! 184 and a half engines! Realistically.. If they build an engine every 2 weeks they'd go through it in a year.

 

[IDIBRONCO]

But thats 369 heads! 184 and a half engines! Realistically.. If they build an engine every 2 weeks they'd go through it in a year.

With all of the people who are looking for them, it sure won't take that long.

 

[DougBoy66]

its funny, when I was first starting on my motor I looked at some refurbished heads from some ebay dealer out of pensacola. We messaged back and forth about them and I kept asking if they had replaced the precups because mine had some cracks and I didnt want to buy a set of heads with the same issue. They would tell me that the precups are in the head. I would ask but are they new? Finally he sent me back a nasty message that said the precups part of the head and called me a ******* Well since he did not know that they were actually removable I decided I didnt want to buy heads from them. But I am a ******* because later I let him rip me off for a crappy injector pump that ended up being a core a month later for one of justin's 80 pumps. You all may have a laugh at my expense now edit-(*******)=un-smart donkey

 

[IDIBRONCO]

Sadly, that type of thing happens to most of us. Despite the common thinking, cheaper isn't always better. Especially when dealing with our engines.