GZE block 20v Head. Will it bolt up?

[omy]

Can you used the GZE piston on a 20v head, as there are only four fly cuts to clear the valves and will the head gaskets be the same?

Cheers

[myne]

Yes.
Not sure if the cutouts make much difference. Since the GZE pistons are dished.
Worst case, the engine becomes interference, meaning if the cam belt breaks you might bend valves.
Mate has a gze bottom with a 20v top.

[limbo]

the 20v basically uses the same block as the GZe they are both 4AG blocks. The heads are slightly different so you would have to check clearances, may be slight work.
But as Myne has said its do-able.

I've generally heard of people doing this on a turbo application using the stronger GZE bottom and bolting on the better breathing 20v head. Rigoli's 20v Turbo has this setup.
If you goto his site you should find the turbo's setup. I believe Samantha Rigoli use to own the car

[limbo]

here's the link
http://www.rigoliracing.com.au/corolla.html

[LeeRoy]

I'm pretty sure that 4A's run a non-interference head. Should have no probs in that regard.

- LeeRoy

[kingmick]

I'm pretty sure that 4A's run a non-interference head. Should have no probs in that regard.

- LeeRoy

yes they do!


and why do you want a 20v on the gze block? out of intrest

[omy]

As I have a 20v turbo setup, that is running low boost, just got a gze engine. Just that all the mani are made for the 20v head so it would be easy to keep the 20v head.

[Ben Wilson]

I certainly hope they bolt up, or my current plan could use some revision

[Hen]

...4A's run a non-interference head...

From the factory, all 4As are non-interference.

However if you start playing with them (big cams, high compression pistons, etc) then they can become interference. Also this depends on both the piston (crown and cutouts) and the head (valve angle and lift).

My opinion: It'll go together and at worst become interference. Then again maybe it will remain non-int.

Hen

[kingmick]

As I have a 20v turbo setup, that is running low boost, just got a gze engine. Just that all the mani are made for the 20v head so it would be easy to keep the 20v head.

cool.

and yes ben they do! so full steam ahead.

[adamaw11]

So noone has yet confirmed whether GZE pistons with a 20v head make it interferance or not?

Are the pistons the only thing that would determine compression ratio, with everything else stock? So if you used the 8.9:1 GZE pistons in a blacktop, silvertop, or 100kw 16v etc, would the comp ratio end up being 8.9:1 regardless (assuming other things remain standard, headgasket etc)

[RONA]

At oran park last weekend there was a Maroon TA celica which had a GZE block and silver top head, all done by the owner who is a friend of a friend. Went pretty hard but he's waiting to get a bigger turbo and up the boost in the hope of cracking 200rwkw.

[Hen]

Are the pistons the only thing that would determine compression ratio, with everything else stock?

No. The combustion chamber volume (in the head) may vary among 4As and so this would have an effect on CR. It comes down to combustion chamber volume (including volume in the head, headgasket thickness and dish/dome of the piston) and swept volume.

Hen

[omy]

Are the head gaskets the same for the 16v to 20v, I have read some where that the oil holes are in different places.

[The Witzl]

well you have both engines dont you? Why dont you have a look???