2.4 Head gasket

[talon14turbo]

I have a 2.4 block 6-bolt with 1g heads. Which head gasket do I use? Can someone give a me a OEM part number?

 

[VETTE_50_TH]

Where did you get a 2.4 6 bolt. Is it a 4gCs or something or do you mean a 7 bolt with a 1g head? If thats what you mean, a 2.4 HG will be fine.

I couldn't find an oem one so... here is an aftermarket. EXTREME PSI : Your #1 Source for In Stock Performance Parts - Cometic Head Gasket : Mitsubishi Eclipse 4G64 / 2.4 Litre

James

 

[kevingst]

I used a Cometic 4g63 headgasket for a 87mm bore, I'm building a g4cs and had it bored .020 over.

 

[interex]

I have been trying to figure out if I can safely run a Cometic 4g63, or if I need a 4g64 Gasket for my hybrid... I'm not to the stage of mounting my head on yet, but I just don't know what the differences are between said two gaskets.

 

[VETTE_50_TH]

Only if you can get the 4g63 HG in a 87 mil size. Other wise it will be to small to go around the block.

James

 

[soulweaver]

If you need part numbers use the advanced auto or the auto zone parts search it works real well with finding part numbers for anything.

 

[talon14turbo]

Yes, it's a g4cs. I was looking at a cometic gasket. I am getting my head re-surfaced as we speak. Do you use copper spray on the cometic? I have been reading that they leak.

One more question for the 2.4 gang. Is it ok to run a comp 280 cam with stock springs & valves?

 

[92tsiawdguy]

You wont want to runs 280s on a 2.4 because they make there power on top unless you plan on rev'n to the moon. I run 272s on my 2.4l with a sc6152sp turbo and they are working great.

 

[interex]

280s on a 2.4L will be like running 272s on a 2.0L. You will need stronger springs. You can go with the Manley, or BC/Crower springs.

My SBR Stage VI head has manley ss valves, 1mm over sized, manley springs, retainers, topline revised lifters, and Crower 280 cams and this is going on my 4g64 hybrid build.

 

[kevingst]

Actually, you'll want to get the gasket with a 86.5mm bore. 87 is for if you get the block bored .020 over like I did mine

 

[VETTE_50_TH]

Yes. My mistake. It is 86.5mm HG.

James

 

[interex]

My block has been bored .020, to 87mm, and with my 1g head will I be able to use a 87mm 4g63 Cometic, or 87mm 4g64 Cometic for the SOHC engine? Knowing this would be a big plus!

 

[talon14turbo]

280s on a 2.4L will be like running 272s on a 2.0L. You will need stronger springs. You can go with the Manley, or BC/Crower springs.

My SBR Stage VI head has manley ss valves, 1mm over sized, manley springs, retainers, topline revised lifters, and Crower 280 cams and this is going on my 4g64 hybrid build.

Darn!!! I just ordered a complete freshly & professionally rebuilt stock 4g63 head. The person I purchased the car from is a jerk & liar so I am replacing all parts that were supposed to be new or rebuilt. The old head did'nt look to good on the surface area close to the cylinder. I was going to swap the stock cams with the comp280's from the old heads. How will car do with all stock head? Any ides?

Also, how could I tell if the block was bored? Should they be some markings?

Thanks for any help. This is a (father/son) project and I want him to have dependable performance vehicle without unnecessary over spending.

 

[92tsiawdguy]

Measure the inside of the bore is the best way to find out the bore size. 280s on a stock head will be ok up to 7k anything after that you run the risk of floating the valves, because the spring wont retract the valve fast enough. 200$ for springs and retainers is good insurance. I run 272s on my 4g64 that is fully built. I gained more streetable hp on the 272s over the 280s. I have a set of 272 comp cams that have low miles on them if your interested.

 

[kevingst]

I used the cometic 4g63 with a 87mm bore. 1g head, g4cs (6 bolt 4g64) I just put the motor back together a couple weeks ago. Everything lined up with the bottom end perfectly.

My block has been bored .020, to 87mm, and with my 1g head will I be able to use a 87mm 4g63 Cometic, or 87mm 4g64 Cometic for the SOHC engine? Knowing this would be a big plus!

 

[interex]

272 is a good cam I won't deny that, for a mild 2.0L ...but note that 272 on a 2.4L will not be like running 272 on a 2.0L (so it has been said hundreds of times).

92tsiawdguy, It sounds like you're talking highly about your cams because you're trying to sell them, which you shouldn't do in the forums.

talon14turbo, you can use the Comp cams you have, but Comp, Crower, HKS, all recommend when you use a cam bigger than 272 for mild performance then you upgrade your springs and retainers. You can get a set of Crower springs and retainers for $208 on ebay or $268 from SBR.

kevingst, thanks for the input, I will most likely use the 4g63 gasket as long as it lined up to the 4g64 block. This is good info. Just waiting on the block and wisecos to get back from the machine shop.

 

[talon14turbo]

Did you use copper spray on the cometic gasket? How is it holding up? With the head off, how hard is it to change the springs & retainers?

 

[interex]

With the head off, how hard is it to change the springs & retainers?

Simple, you just need a valve spring compressor. You can buy one from many of the vendors, AutoZone I believe leases one out if you don't want to buy one.

 

[92tsiawdguy]

I wasnt trying to sell my cams i was just giving him an option. 272s on a 2.4l work awesome. I actually drive a high hp 2.4. I know the difference. 280s offer longer duration, which isnt all that you need. you need stroker cams if you want to do it right. With 280s you will run into piston to valve clearance issues and retainer to guide interference issues. One of the best cams to use is the fp3 stroker cam its made for 100mm stroker engines. No clearance issues they are drop in.

 

[VETTE_50_TH]

You can't really tell if the block was bored out or not with using a gauge. But you can tell if it was honed by looking at the cross hatching. It will look fresh and everything will be very smooth.

It you should always upgrade the springs when you go to bigger cams, esp 272 or 280. I will be running BC 280 cams and BC 0100 springs which are the recommend springs for that cam. My head was built by Wes Hess (hesspower.com) and he did an excellent job.

Here are some pics.


http://www.dsmtuners.com/forums/att...much-did-your-maching-cost-dscn0549_small.jpg

http://www.dsmtuners.com/forums/att...much-did-your-maching-cost-dscn0547_small.jpg

http://www.dsmtuners.com/forums/att...much-did-your-maching-cost-dscn0554_small.jpg


James

 

[92tsiawdguy]

They will require double valve springs though.

 

[VETTE_50_TH]

I wasnt trying to sell my cams i was just giving him an option. 272s on a 2.4l work awesome. I actually drive a high hp 2.4. I know the difference. 280s offer longer duration, which isnt all that you need. you need stroker cams if you want to do it right. With 280s you will run into piston to valve clearance issues and retainer to guide interference issues. One of the best cams to use is the fp3 stroker cam its made for 100mm stroker engines. No clearance issues they are drop in.

I heavent read any problems like that until the valve begins to float. They do open up a hell of a lot longer than 264/272. But, the 280s just need to be timed correctly and everything is fine. I know plenty of people that run that cam on stock motors and it works fine for them.

But, timing and having a good spring is in order to make it work.

James

 

[92tsiawdguy]

"I heavent read any problems like that until the valve begins to float. They do open up a hell of a lot longer than 264/272. But, the 280s just need to be timed correctly and everything is fine. I know plenty of people that run that cam on stock motors and it works fine for them."

on a stock 2.4l engine?

 

[jrohner]

I wouldn't want anything smaller than 272's on an engine larger than 2.0. More displacement makes the same cams 'smaller'. Sometimes I almost wish I would've went with 280's even. My BC272's gained me power everywhere and the spool is identical to stock cams.

 

[VETTE_50_TH]

"I heavent read any problems like that until the valve begins to float. They do open up a hell of a lot longer than 264/272. But, the 280s just need to be timed correctly and everything is fine. I know plenty of people that run that cam on stock motors and it works fine for them."

on a stock 2.4l engine?

Im sorry. I thought you referring to like a 2.0 or 2.3.

My bad.

James