Livernois 3-valve block in an 03 Cobra?

[hookandpull]

A good friend of mine has this block 4.6L 3-Valve 298ci Pro-Series Stroker Shortblock - Livernois Motorsports and is willing to cut me a huge deal on it. I am wondering if anyone has used one of these blocks with their cobra heads and accessories? I called livernoise and they said all that needs to be done is gasket match the oil galley's which they should be almost dead on anyways. That didnt make me comfortable enough. They said I should change out pistons as well but I said my buddy is running enough of a dish piston that he yields 9:1 compression on a 3 valve so I would think they are about the same dish as the Cobra pistons. I have yet to get the build sheet but before I go through the hassle of all that I would like to know if anyone has attempted this?

 

[hookandpull]

Nobody?

 

[hookandpull]

MMR said I shouldnt have a problem yet Livernois said I may have a problem lmao

 

[ugotbit03]

Who did you talk to at Livernois?

Mike Schropp would be the guy to talk to.

I would be worried about valve relief's not jiving like you want them too.

 

[hookandpull]

I would think That the pistons are dished enough that I wont need valve reliefs.

 

[ugotbit03]

I would think That the pistons are dished enough that I wont need valve reliefs.

That depends on the camshafts and where they are placed.

 

[hookandpull]

If the block is just like a Terminator block and the pistons have the same dish as the cobra Pistons and I am running 03 Cobra heads I still wouldnt think the valve reliefs would matter. But again I have never built a cobra motor I have only built pushrod strokers.

 

[ugotbit03]

That's true if the cams are stock and they are installed at the stock LSA(114)

I guess it depends how bad you want it and how good of a deal it is.

Are the pistons dished and have valve reliefs?

 

[hookandpull]

No sir they are just dished

 

[ugotbit03]

Hmmm.

Well, I'm not up on 3V stuff, so IDK if they use a different pin location or installed height. I do know they have 3V specfic slugs, but I don't know what is different. A quick peak at Diamonds listings show the compression distance the same as 2 and 4V's.

Again, I would try Livernois back and see if you can talk to Mike. He is in charge of engine development.

ETA- Deck height would be something to find out as well.

 

[jrgoffin]

If it's the "production" block, then that is the same block FRPP uses in the Aluminator, but you'd have to verify what they mean by "production". That block may be the '05-'10 Mustang GT 3V Aluminum block. Ford Racing doesn't sell the bare block any more, but the Ford p/n is 8R3Z-6010-A.

Here's the casting number (and you can also see the Nemak logo above it):

 

[hookandpull]

Ill give Mike a call

 

[2mchtoy]

The zollner pistons in the cobra motor have no reliefs. the 3 valve does. especially built motors. I built my 3 valve and if your using stock cams, i wouldn't be worried using it in my cobra.