6 bolt 4g63 in 2g Eclipse GSX cylinder head removed in under 10 mins

Removing the head of a 4G63 in 10x speed.

The project got delayed a few months. After finishing it and cranking it over, Interference in the cylinder was discovered. Shamefully, I admit my mistakes were: 1) Not putting the spark plugs in immediately after installing the head. 2) The bad habit of using my Valve Cover as a parts tray and 3) Putting off the project too long, so I didn't recognize a missing bolt from a custom fabrication.

The head needed new valve seats, valves and some welding. Wiseco and the machinist both thought I'd be OK running the piston after smoothing out hot spots, but I ordered a new piston not wanting to risk the deep gouge in it with the high boost I plan to run. Peace of mind is priceless.

The danger in being over confident is sometimes you skip triple checking stuff. I've built that engine at least 5 times and got careless.

You can see the port work I did on the head @ http://www.southernutahautos.com under "Tech Tips" and "Beyond Bolt-ons"

Category:

Autos & Vehicles

Tags:

• mitsubishi eclipse
• Valve damage
• 4G63
• Cylinder Head
• 6 bolt
• GSX
• Wiseco Piston

[Xtraordinary70]

I'm a little new when it comes to DSM's. I'm a Honda guy but I've really been getting into DSM's, tired of fwd. The main thing I'm concerned about is the 7 bolt setup in the 2g..I see alot of people goin for the 6 bolt setup..why is that, if I wanted to stay around the 250whp range would a 7 bolt be ok? Or is it not recommended?

[southernutahautos]

@Xtraordinary70 7 bolt can easily handle 250 whp and you can get there without having to touch internals. The only reason why you'd possibly swap based on ur goal is if your crank is walking, otherwise run it. However, here's a warning ( and I believe any dsmer will back this one) once u start playing with dsms ur goal of 250 can easily climb to 350, 450, etc as u realize the potential that exist. If u mod right u can use most them on a 6 bolt if ur goals ever change and require it.

[miked156]

how can u tell the difference between a 420a and a 4g63 and which is a 6bolt and which is a 7bolt?

[southernutahautos]

The timing belt on a 420A are on the passenger side, 4g63 the driver side (DSMs). Also, 420As are all 95+ Non-turbo (stock). 6 & 7bolt refer to the # of bolts on the flywheel of a 4g63. Generally 4g63 from 90 -94 are 6bolts & and all 95+ 4g63 DSMs (2g) are 7bolts. The differences between the 6 & 7 are more then the flywheel, but overall block design. look @ front cover, if the bottom is flat where it meets the oil pan it's a 6bolt if it dips down about 1/2 an inch its a 7bolt. Hope this helps

[saksekj]

No I know never to come to your shop

[Ub3rNo0ber]

You should have never told us WHY you're tearing it down because now I'm just irritated with you.. =/

[wes39393]

Wow, you sure took the hard way taking that head off! lol. As for everyone talking about 7-bolts crankwalking, it's not as common as people think. And 7-bolts can handle just as much power as a 6-bolt with the right internals.

[DALE97DSM]

Awesome. great music who's the artist I like to see a video of the 420a head removal or whole motor, in 10 minutes

[Jafromobile]

BAM! Right in the Favorites list. It has a moral and everything.

>Click< Liked.

This video is Jafro approved! d (ツ) b

[xthomastragedyx]

call me names, try to put me down, i dont care, the GS, and RS (420a engine) are DSM!!!!!!!!!!!!

[TimFanslau]

@LynxOGrady cranks walk is very unlikly on a 1g DSM, I dont recall hearing of crankwalk on a 1g, only 2gs. Also a 92 has a 6bolt motor, which is a better versoin of the 4g63

[LynxOGrady]

Hey guys, im looking at a 92 Eclipse with a 4G63A (I think) Is ther anything i should be aware of other than crankwalk...if that affects that motor?

[YungJuiceman23]

@southernutahautos Yo 6 bolts are 90-92.5 .1G cars had 7 bolts if they were made after 92.5. Just helping out a fellow DSMER

[elementalwindx]

I can see why you rebuilt that motor 5 times, LOL You like to take the hard way when removing heads huh?