Austarion

The 4g64 head flows better etc apparently and seems to be a pretty regular mod guys do to their Starions.

I cant go mpi yet but am told the head will be a straight swap and give better flow .

Is this correct? as ive found one

So just a matter of unbolting head off the Staz and chucking this one on ?

Can someone tell me the ins and outs of how exactly to do this remembering im a beginner?

Tamgesic wrote:The 4g64 head flows better etc apparently and seems to be a pretty regular mod guys do to their Starions.

I cant go mpi yet but am told the head will be a straight swap and give better flow .

Is this correct? as ive found one

So just a matter of unbolting head off the Staz and chucking this one on ?

Can someone tell me the ins and outs of how exactly to do this remembering im a beginner?

That's it BUT it will lower the compression ratio due to a larger chamber in the head .From my fadeing memorY
63 HEAD =APP 48CC
64 HEAD = app60CC and 3mm larger valves and ports
Suggest you pm Redzone for finer details

Yes it's a straight swap.

Oldfart is right, the compression ratio will drop considerably and considering you are most likely running standard pistons it isn't a great idea unless you do a rebuild and replace them with something with a smaller dish to make up for the bigger combustion chamber.

If it's not to expensive (not over $250) it's definitely worth grabbing as they are gems (Rare as hen's teeth) and won't loose their value.

To change the head, you will need to undo all the ancillaries (alternator. powersteering and air con belts, timing belt, inlet manifold and exhaust manifold, unbolt turbo from dump pipe etc). Then undo the head studs and then finally make the swap. It sounds a lot harder than it actually is, just time consuming and fiddly.

I know I used to think all this was hard but been doing a bit of work on Staz latley and it really is just a matter of undoing bolts , replacing part and doing bolts back up ! ..so far.

Yeah i found one under $250 .

But are you saying you cant do without a rebuild? I was told you can but i wouldnt trust the person who told me anyway .

So is it possible to bolt it on or not going to be good for engine?

The dramatically lower compression ratio which would result from fitting the 4G64 2.4 head would far out-weigh the gains you would get from the larger valves and ports. To make the most of it, you'ld need to run higher compression pistons at the very least to make up for it (as what Old Fart outlined), and then change to MPI and use a larger turbo to fully reap the benefits.

It's not going to give you any gains if you just swap the L300 head on your standard block with standard pistons, and bolting your standard ECI inlet manifold and standard exhaust manifold and TC05 back on.

WELL DONE !!!

My thoughts confirmed.

Cheers

will be nice to do later down the track once mpi but for now it looks like ill still start with putting the tc06 on .

It is possible to fit the 2.4 head on a 2.0L engine. We (The Netherlands) have done this a few time's. You have to take a total of 1,2 mm of the head. You can also remove the casting imperfections out of the intake ports for better flow.


Gr,

Martijn.

.... Wouldnt' it be easier to just deck the head rather than swapping to high comp pistons and what not?

Also you'd get a dead flat surface which will seal better.

There's -always- a 2nd option :)

Most cylinder heads have a minimum thickness marker on them. If you deck below that there is all sorts of problems that can occur. Don't forget that if you ever needed to pull the head off again, that it may be a throw away item because, there is simply not enough meat left on the head.

Entaran wrote:.... Wouldnt' it be easier to just deck the head rather than swapping to high comp pistons and what not?

Also you'd get a dead flat surface which will seal better.

There's -always- a 2nd option :)

Yes but to deck the head enough to make up for the 6:1 compression would end up with valves hitting the pistons.. also as what Shannon said the max you would generally shave a head is about 0.5-1mm anyway which would account for about a raise of about 0.5-1 in the compression ratio.

As I said before, we did deck the head and took 1,2/1,3 mm of the head. No problems so far, the car is running without any problems for 5 years now.


Gr,

Martijn.

or deck the block as well. you just need to get the piston squish( or quench) area down to reduce the risk of detonation and then run more boost to get the cylinder BMEP back up.

this head is only $120 which is a steal. Maybe i should get it anyway

yeah jump on it for when u build a good motor. we have found a cometic multilayer gasket that works with it. the 4G64 head has bigger ports and valves, and the valve angle is different aswell. you will need to open up your manifolds to take advantage of it though.

with 12cc dish VR4 pistons in my orange car and the 64 head it made awesome power without too much effort.

would it be fair to say that the ex i have might have the higher compression pistons which when combined with taking a bit off the head (0.8mm or something) might result in a workable compression ratio?