Hey guys in the process of having my 4G64 bottom end o-ringed with a graphite gasket, just wondering at what power figure your non-o-ringed block has started to have the head lift and start pushing water, as ive heard this is a common problem with 64's block. Any tips you guys have to seal the head better?
Any particular headstuds or head gasket?


Cheers Guys

 

Making around 650+ at 40ish psi with no issues. Running the JE proseal gasket and L19 studs.

 

I take it that's on E85. Any unusual precautionary prep other than decking the block and head? No o-ring right?


Also, I've been curious about those head gaskets by JE. Why did you choose it? In for learning.

 

A quality set of head studs (H11, Age 625 or L19) flat smooth finish (on head and block) and a proper Torque procedure should do the trick.

JE is good, Cosworth is great with O-ring, or OEM MLS. I don't like the cometic, never have never will

Don't forget to re torque after 50-100 miles.

 

whats the proper procedure to install l19 studs?and what torque should be used?

 

Yes on E85.

I chose it because Wiseco mislabeled their pistons on the 4G64 application. The head volume is incorrect on the spec sheet causing a bump in compression. I did some research on JE because they make the thickest gasket for the 4G64 to lower the compression. They look like quality parts and I watched all the videos they had on them. There were not many reviews on here so I figured I would try it out for myself. It holds up great. No complaints here. It is a quality gasket and it is pretty cheap. I think it was 80ish shipped. Its fully rubber coated like the OEM one.

I did not deck the head and block. The block had low miles on it so I used WD40 and 2000 grit sand paper just to refinish the surface on both the head and block. I sprayed the gasket with copper spray and put it together.

It does not have o-rings.

 

Same as all the other studs. Follow the factory torque sequence in 3 equal steps. Some people debate about the final torque spec but I am at 100ft pounds on the L19s.

I usually do 30, 70, 100. Then retorque after a few heat cycles.

 

Oring and MLS headgasket and you will be fine, surface prep is very important, the smoother the finish the better!

 

2.4LR with 10:1 manley pistons and Flat Out HG no ring. 480 on 90 pump at 28, 616 on e85 at 36psi.
Used a piece of glass and 400 sandpaper on the block and head to smooth it out. No problems.

 

601 on mine, 32.5 psi on e85

 

Depending how far you push it, you'll eventually have to go to an o-ring setup... SS o-ring in head, OEM MLS gasket is pretty easy/popular choice.

 

Your static compression ratio doesn't matter.

How much boost the turbo makes doesn't matter.

All that matters where the head gasket sealing surface is concerned is torque (pressure) and hp (heat).

 

cometic gasket, standard arp's @100ftlb(3rd time using them even), 30 psi 600whp, holding strong. I aim to up the boost here soon, so we will see I guess

 

User results vary, you aren't suppose to see any head lifting if you're cylinder deck and head surfaces are proper and you have have even fastener tension.

 

These studs are 25% overtorqued and probably close to yield (failure). FYI


The 4G64 block is more prone to issues despite this, at least partially due to its thinner cylinder wall thickness.