Did you read the jim wolf PDF? The modification to the head is only required for use of the HR headgasket, not the HKS headgasket designed for the DE motor.

 

There's just one part number for HKS Z head gaskets though, right?

https://conceptzperformance.com/hks-...z33_p_1282.php

 

I don't know why that says DE/HR. There are different configurations for each in terms of coolant flow. You can see in the pics that the ports are all on cylinder 5,6. That is the DE design (not HR).

 

Hmm... Concept Z told me the HKS gasket would be the same for wither application, I was previously running the HR Z gasket and had the block machined accordingly... this isn't awesome news.

 

If you don't machine that area under the gasket then the coolant won't flow like it should and over heating can occur.

"stopper" gaskets are just gaskets with a compression ring around each cylinder. That metal gasket smashes and conforms to the head/cylinder to make a solid seal. Most head gaskets have a stopper crush ring on them. Some like to use it as an advertisement in order to make it sound better than others but it's rare to find any without it now.

I've used cometic gaskets on all my builds without any issues. People say they don't hold power but cometic was the first gasket available for the 100mm big bore engines that were pushing over 1k hp. If they can handle the big bore engines then they can handle the stock bore.

The biggest factor on getting a good head gasket seal is a flat surface for head and cylinder and compression force. Using an L19 stud allows for a higher clamping force which will give a stronger seal. Having a perfectly flat surface will also get a gasket to hold more pressure.

 

get the de headgaskets OEM.

450 whp on built motor is like nothing for the motor. most people who run 400 whp on a stock block blow their motor because of rods.

headgasket doesnt usually fail.

I have the DE OEM headgaskets on my block I run 700 whp.

but i have a daily drive map of 400 whp.

DE headgaskets are good enough they are MLS aka multilayer steel which is sufficient enough.

unless your a crazy track person then i would suggest cometic.

 

I was at about 450 but will be going at least 600hp this time...and I hot the hks gaskets in a package deal, so I might as well use them.

Are you on stock head bolts for 700hp?

 

I got ARP L19.

600hp means you should get L19 cheap insurance. i foresaw all this when i spoke to the machine shop about my power goals.

you dont want headlift......ask thatv35guy lol he learned his lesson.

 

Jim Wolf says...

http://www.jimwolftechnology.com/wol...head_bolts.pdf

But ConceptZ is not wrong. You could use the DE gasket (HKS) but you would not have the coolant flow described in the PDF above. If you've already gone to the trouble of machining the block, you should use the cheaper, redesigned HR gasket. With the L19 I think you still have a winning combination.