Injector cut-outs

DaveEFI · Post by **DaveEFI** » Tue May 22, 2012 10:11 pm

I've got a new pair of cylinder heads without the injector cut-outs. The manifold gasket shows approx where they go - but can anyone give some further details? Obviously, I'd like to do this before removing the old heads.

ChrisJC · Post by **ChrisJC** » Wed May 23, 2012 7:00 am

Head:

Gems manifold:

SD1 manifold:

Any help?

Chris.

DaveEFI · Post by **DaveEFI** » Wed May 23, 2012 7:29 am

Perfect, Chris.

sidecar · Post by **sidecar** » Wed May 23, 2012 7:39 am

As the inlet tracks have been opened up you may not even need the cut outs, I guess a bit of measuring is required in order to find out.

DaveEFI · Post by **DaveEFI** » Wed May 23, 2012 8:24 am

sidecar wrote:As the inlet tracks have been opened up you may not even need the cut outs, I guess a bit of measuring is required in order to find out.

Is that part of the mods? They don't look like they've been touched - I've removed a lip round a few of them.

But I can draw out a template from the pics Chris posted, and see if it has.

DaveEFI · Post by **DaveEFI** » Wed May 23, 2012 2:48 pm

Here's a drawing that might be a help to others. No guarantee it's micron perfect.

bodger · Post by **bodger** » Wed May 23, 2012 9:13 pm

love the work on here

i fitted efi to mine carb engine and didnt bother with cutouts , never found it to be a problem ...but thats a bodger for you ..lol

DaveEFI · Post by **DaveEFI** » Thu May 24, 2012 1:04 pm

After all that, was chatting to a pal who used to have a Rangie, and he had a pair of 3.9 heads lying around. So I've just collected one so I can see the cut-out for real.

What is interesting is they appear to have a slightly different profile to the roof of the inlet port to the heads I've just bought - they appear to be opened out after an initial hump. The square hole on the face is the same. Are there different castings? The Burgess site implies he only uses SD1 castings or later.

The part numbers on the castings are the same ERC 0216, although the actual lettering is different.

Other think is I've measure the distance between the head face and the platform above the inlet face which appears to be a machined reference.

My new heads are 62.28 /62.45mm, the 3.9 one 63.3mm Does this mean they are meant for composite gaskets?

DEVONMAN · Post by **DEVONMAN** » Thu May 24, 2012 6:52 pm

Hi Dave.
According to my book, The dimension is 63.5 mm for steel shim gasket and 62.56mm for a composite gasket.

Your new heads may have been skimmed of course ?

Cheers Denis

ChrisJC · Post by **ChrisJC** » Thu May 24, 2012 9:08 pm

Indeed. Here are the dimensions for a composite gasket head:

Chris.

DaveEFI · Post by **DaveEFI** » Fri May 25, 2012 1:58 pm

Right - both my 'new' heads fall within the limits for a re-surfaced composite gasket head. I read elsewhere there are two thickness of composite. How do I know which to buy? It's a 3.5 litre and I shall leave off the outer row of bolts.