replacement cylinder head

raybbaby · Post by **raybbaby** » Mon Feb 27, 2006 1:26 am

Someone told me I can easily use a 4ac cylinder head on my 3ac which keeps blowing headgaskets. I think it needs to be milled down a little though. Does anyone know how much to take off or where I can get specs or any info on this?

takza · Post by **takza** » Mon Feb 27, 2006 6:23 am

Find a local machinist who does heads?

raybbaby · Post by **raybbaby** » Fri Mar 03, 2006 12:17 pm

I've removed the head. now upon inspecton, it seems that the head may not be warped, but it was leaking. I had to have the block decked, and that left the pistons 2 one thousandths proud at the top of their stroke. I've had to use a shim between the block and the headgasket and that is where it appears to be leaking. What kind of sealant can be used? Any suggestions or helpful hints?

takza · Post by **takza** » Fri Mar 03, 2006 7:57 pm

As far as I know....headgaskets are meant to slip some as the head expands differently than the cast iron block.

I don't know...except to maybe find a thicker after market gasket?

I'd do some asking around before you put it together again for sure....someone who redoes heads and engines day to day?

Check with a good straight edge?

Some kinds of gasket goop are supposed to work with head gaskets?

GTSSportCoupe · Post by **GTSSportCoupe** » Sat Mar 04, 2006 11:59 am

raybbaby wrote:I've removed the head. now upon inspecton, it seems that the head may not be warped, but it was leaking. I had to have the block decked, and that left the pistons 2 one thousandths proud at the top of their stroke. I've had to use a shim between the block and the headgasket and that is where it appears to be leaking. What kind of sealant can be used? Any suggestions or helpful hints?

If the block has been decked, just get the head resurfaced as well. Use an OEM Toyota head gasket, and torque in the pattern and to spec as is noted in the Toyota factory repair manual.

If your head has leaking problems even after being milled, then you should be looking for a new head. Maybe it is cracked or something?

raybbaby · Post by **raybbaby** » Sat Mar 04, 2006 12:12 pm

I appreciate the responses but it should be made clearer by me that the leakage isn't from trhe head, or even the head gasket. That seems to have been holding. The problem looks to be the metal to metal contact I get between the top of block and the shim itself. Can this be sealed with some kind of adhesive? Will it require a gasket on either side of the shim?

takza · Post by **takza** » Sat Mar 04, 2006 2:53 pm

I guess you mean that the shim is in the shape of a head gasket...but is made of metal? The side towards the block could be "glued" with about the best gasket goop you could find...what the best is??????

Post by **ARCHINSTL** » Sat Mar 04, 2006 3:52 pm

Not to knock anyone's suggestions/hints/help, but this would seem to be something that would require a professonal's advice, and cannot be that rare of a situation.
How about trying a place that specializes in the preparation of engines for "real" dragsters? Those guys are pretty clever, and experienced with all kinds of home-brewed engine answers.
Tom M.

Lollypop · Post by **Lollypop** » Tue Mar 07, 2006 10:50 pm

I want to hear the answer to the question.....Can you put a 4ac head on a 3ac motor?

Annnd is there any problem with that?

-----Justin-----

Gasoline Fumes · Post by **Gasoline Fumes** » Wed Mar 08, 2006 9:32 pm

I have to admit I've never taken a really close look at a 4AC head, but I thought the two heads were the same.

Lollypop · Post by **Lollypop** » Wed Mar 08, 2006 9:44 pm

I'm not sure if they are but I would say they are but wanna know for sure...then I can get the paradise kit for it.

-----Justin-----

Tercel4WD.com

replacement cylinder head

replacement cylinder head

shim leakage