Head Gasket Repair

[CtGuy93]

I’m tuning my 4G64 and replacing gaskets. Can anyone tell me if my engine has head studs or bolts?

[royster]

My 1990 4G64 has female hex head bolts, if I remember they're 10mm. I don't know if they changed that for '92.


Be sure to take precautions to not drop lifters from the assembly when you remove them. Here's a helpful hint:

http://www.mightyram50.net/vbulletin/showthread.php/2954-Why-didn-t-I-Think-Of-That?p=26624&viewfull=1#post26624

Head bolts can be seen, next=to=last photo, right-hand side of photo.

http://www.mightyram50.net/vbulletin/showthread.php/2956-Roy-s-Garage-90-2-4-4G64-5-spd-D-50?p=26317&viewfull=1#post26317

[geezer101]

Mitsubishi used head bolts. Be sure you know what type you will need as there are different length bolts with different diameter shoulders on them.

[CtGuy93]

Should I replace them with new bolts or switch to studs and nuts?

[85Ram50]

Should I replace them with new bolts or switch to studs and nuts?

I don't think you can switch. Some of the head bolts are reusable. When I replaced my 1st gen head a few years ago the Mitsubishi dealer could still get them so I went with new.

[geezer101]

I don't think you can switch. Some of the head bolts are reusable. When I replaced my 1st gen head a few years ago the Mitsubishi dealer could still get them so I went with new.

Companies like ARP will make them but they are not going to be cheap. A new member had an issue with finding the right head bolts for their 4G64 and ended up sourcing the correct ones for their engine from a forklift application.

[pennyman1]

4g64 head bolts are reusable, no need for new ones.