As above need to no what thickness head gasket I need block is a v1 cdb from a k reg classic and I have v5 sti heads thanks

 

What pistons are/will you be running ?

Mick

 

Standard cdb just replacing my broken block

 

What version car do you have?
What was you original block/engine as need to know what pistons you are using
V5 STi ? if you are using the heads ?


Mick

 

I have a v4 with v5 sti heads and sti8 bottom end spun the bearings so have purchased a v1 cdb from a k ref classic

 

If running the standard STi V8 pistons and STi 5 cylinder heads, then an educated guess would be 0.6 or 0.78 MLS head gaskets depending if the heads/block faces have been skimmed in the past.

Only the person building the engine can determine the correct gasket thickness after measuring everything and checking the head vols etc.


Mick

 

Not using a v8 sti bottom end that's what I had it's now going to be a v1 cdb and it's me that's going to be putting it back together

 

Speak with as performance. Ordered mine from them the other week and he reccomended the correct ones

 

Regardless of what block you are using as they share a common standard deck height from the factory - what pistons are you using in your build ?

Mick

 

Standard pistons that are already in the cdb I brought

 

If using the standard dog bone pistons from the CDB with the STi 5 heads :
1.6mm gaskets would give you a static CR of approx. 8.1:1
1.1 mm gaskets would give you around 8.4:1

Mick

 

How have you got around the inlet manifold problem?

 

Yes mate I have custom mani

 

Cool, we had to get inventive when I went for a version 3 manifold on my old version 2

 

Is it just a standard untouched 23 year old block you are using ? Seems like alot of work and expensive to gamble on an old block.

 

Custom manifold was done ages ago mate when I had v8 sti bottom end so just replacing the block for a v1 cdb until I get round to getting the v8 rebuilt

 

I wasn't questioning the manifold buddy.
Just wondered why you opted to use an old block that isn't exactly known for its strength. This whole exercise will be costing quite a few hundred quid and alot of work, surely you would of been better just sourcing a low mileage newage STI block and being done with it ???