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Old 07-14-2022, 04:12 PM   #1
Mauled
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Default Valve train options

What are good options for a complete valve train for an ej207 looking to make 500hp. I want to change cams as well. I just dropped my heads off at the machine shop and they told me to make sure the valves i order match up with the springs and retainers, as well as the cams.


I am looking at gsc intake size 36mm and exhaust size 32mm. and gsc beehive valve springs and gsc s1 cams. I think i should change the valve seals as well and the keepers. Is there anything else i should consider ordering?



Also is there any information i should give to the machine shop that would help them with getting these heads rebuilt? They mostly do v8s. If anyone could chime in that has gotten their heads rebuilt from a local machine shop, i'd appreciate it. This is my first real build, and i'm a newb so please don't flame me for not knowing.
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Old 07-15-2022, 01:18 PM   #2
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double post delete

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Old 07-15-2022, 01:18 PM   #3
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I bought gsc s1 cams, beehive springs, and their valves and seals as well as oem keepers. wish me luck on this. I understand that i need to measure the bucket to cam lobe clearance and am going to have to measure and buy new buckets.

The cams are 268/266 duration. Will this be ok on a 30r sized turbo or do you think 264 would of been better? And do you think i could turn the rev limiter up to 8500, bottom end is stock, I will be pushing 24 psi on meth. I kept the bottom end stock because the motor only has 40k miles and looks pristine. Engine didn't even burn any oil between oil changes.

Edit: the cams are actually 264/264. I think this will be perfect for a 30r-35r sized turbo. Cant wait to get this together and drive the car again.

Last edited by Mauled; 07-15-2022 at 03:29 PM.
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Old 07-16-2022, 02:50 PM   #4
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When u do break a piston, hope it dosnt kill anything else. Keep a close eye on oil, failure mode of broken ringland is a spun rod cause it used up the oil while u weren’t looking.
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Old 07-16-2022, 03:03 PM   #5
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Would built heads cause the bottom end more stress? I plan on keeping the same 8k redline until I get the bottom end built.

Benflynn, do you think it's worth it to build the short block now or just leave the bottom end stock? I know the ej207s are solid blocks but I don't know what their power limit is. I only want to hit 450-500whp max. If it's not broke, should I just run it or would it be smarter to get it built now?

This car isn't my dd, it's just my second car for having fun on the street.
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Old 07-16-2022, 03:52 PM   #6
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Would built heads cause the bottom end more stress? I plan on keeping the same 8k redline until I get the bottom end built.



Benflynn, do you think it's worth it to build the short block now or just leave the bottom end stock? I know the ej207s are solid blocks but I don't know what their power limit is. I only want to hit 450-500whp max. If it's not broke, should I just run it or would it be smarter to get it built now?



This car isn't my dd, it's just my second car for having fun on the street.
Stock 207 block likely won't last very long at 500 whp

Especially on pump gas
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Old 07-17-2022, 12:18 AM   #7
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Alright, looks like I'm sticking with 450 until I get it built. I hope a 3071r gen 2 can get me to 450 on methanol.

Fierysun, if you read this, does your 7163 ej207 still run?
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Old 07-17-2022, 12:38 AM   #8
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Alright, looks like I'm sticking with 450 until I get it built. I hope a 3071r gen 2 can get me to 450 on methanol.



Fierysun, if you read this, does your 7163 ej207 still run?
Even 400 on most dynos is a lot. 450+ on pump gas and meth probably won't last very long.

You're definitely going to want some head studs and a really good tune.
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Old 07-17-2022, 11:43 AM   #9
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I'm getting arp 625s, so far I have ran the 207 at 450 for 2 years without issues on stock block but I lost compression after 2 stepping and hitting limiter a lot and burned some valves. Now I'm getting the heads rebuilt.

I might get the outfront closed deck 2.14 stroker block if you guys don't think the 207 bottom end will hold 450 for long. But like I said I pulled the heads and the cylinder walls still have original honing and bottom end looks perfect. So maybe I'll just run the 207 till it dies.
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Old 07-17-2022, 12:13 PM   #10
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[quote=Mauled;46757493]I'm getting arp 625s, so far I have ran the 207 at 450 for 2 years without issues on stock block but I lost compression after 2 stepping and hitting limiter a lot and burned some valves. Now I'm getting the heads rebuilt.

I might get the outfront closed deck 2.14 stroker block if you guys don't think the 207 bottom end will hold 450 for long. But like I said I pulled the heads and the cylinder walls still have original honing and bottom end looks perfect. So maybe I'll just run the 207 till it dies.



I just cant decide between these 2 turbos, GTX3076r Gen2 or GTX3071r Gen2.


The GTX3076r Gen2 is a 67lb/min turbo, compared to my old gt3076 which is a 52lb min. I don't know if the GTX will spool later or have the same spool, since it flows a lot more? My old 3076r made 26psi by 4500 which i'd like to keep that spool or spool sooner if i can.



The GTX3071r Gen2 is a 60lb/min turbo, i'm wondering if it will make more power then the old gt3076r i have since it flows more? If the 3071 can hit 450whp then i will get that, but i'm not sure because there isn't a lot of data on the gen2 turbos. I know you told me about the g30 660 but i am not impressed because it falls off before the gtx does, it is too small to make top end.

So far i am leaning towards the GTX3076r Gen2, i just hope it doesn't spool later then the gt3076r. I'd like to keep spool at 3800-4500. And i will run 24psi max on meth until i get the bottom end built or buy that stroker block.

Last edited by Mauled; 07-17-2022 at 12:20 PM.
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Old 07-17-2022, 12:15 PM   #11
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I'm getting arp 625s, so far I have ran the 207 at 450 for 2 years without issues on stock block but I lost compression after 2 stepping and hitting limiter a lot and burned some valves. Now I'm getting the heads rebuilt.



I might get the outfront closed deck 2.14 stroker block if you guys don't think the 207 bottom end will hold 450 for long. But like I said I pulled the heads and the cylinder walls still have original honing and bottom end looks perfect. So maybe I'll just run the 207 till it dies.
450 on a what kind of dyno? ;p

The stock 207 block is just that, stock. It can hold up to some serious abuse, and is thankfully semi closed deck, but in the end is a stock block with generally unknown history before install.

But hey, if you have it and don't mind spending money on a setup or tune that may blow up soon, I say send it.

This is coming from someone running a 20G at 25 psi on a stock USDM 205 longblock.
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Old 07-17-2022, 12:16 PM   #12
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l just cant decide between these 2 turbos, GTX3076r Gen2 or GTX3071r Gen2.

The GTX3076r Gen2 is a 67lb/min turbo, compared to my old gt3076 which is a 52lb min. I don't know if the GTX will spool later or have the same spool, since it flows a lot more? My old 3076r made 26psi by 4500 which i'd like to keep that spool or spool sooner if i can.

The GTX3071r Gen2 is a 60lb/min turbo, i'm wondering if it will make more power then the old gt3076r i have since it flows more? If the 3071 can hit 450whp then i will get that, but i'm not sure because there isn't a lot of data on the gen2 turbos.
Get a g30 770. It's better than both

Remember though there's more to turbos than cw flow measurements. The 3576 is also a 67lb/min turbo
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Old 07-17-2022, 12:55 PM   #13
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450 on a what kind of dyno? ;p

The stock 207 block is just that, stock. It can hold up to some serious abuse, and is thankfully semi closed deck, but in the end is a stock block with generally unknown history before install.

But hey, if you have it and don't mind spending money on a setup or tune that may blow up soon, I say send it.

This is coming from someone running a 20G at 25 psi on a stock USDM 205 longblock.
I'm going to give rallispec a call since they are close to me and see how much it would be to replace pistons, bearings, and rods.
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Old 07-26-2022, 09:23 PM   #14
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a simple GT3076R will put you right there near 500whp. Your cams you choose will be fine. You'll be pulling 8000rpms all day to ride that powerband. Do your oil system a favor by adding in an oil cooler. If you haven't already, get killerB headers.

Is this a rotated turbo setup or stock location?
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Old 07-26-2022, 09:23 PM   #15
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Double Rainbow!
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Old 07-27-2022, 12:05 PM   #16
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a simple GT3076R will put you right there near 500whp. Your cams you choose will be fine. You'll be pulling 8000rpms all day to ride that powerband. Do your oil system a favor by adding in an oil cooler. If you haven't already, get killerB headers.

Is this a rotated turbo setup or stock location?

Rotated, im going to run a gen 2 gtx 3076r and 93 with 50/50 methanol. i cant find any data on this turbo with the ej207 so i hope it won't be too big with the .82 ar. I just want 460-500whp, think i can hit that on 24 psi? I will look into getting an oil cooler, thanks for the suggestion.



I have a question though, is it stupid to re use the old lifter buckets from my old cams?



And what head gasket thickness does the ej207 version 8 use? I think i can get away with using the stock gasket, the machinist said he only took 6 thou off the heads. I'm running arp 625 head studs. Max boost i think i will run is 26 psi, because the block is still stock pistons. Can you suggest any head gaskets to me?

Last edited by Mauled; 07-27-2022 at 12:18 PM.
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Old 07-27-2022, 07:48 PM   #17
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If you bought a used gtx3071, if it’s a lil small, a compressor wheel, housing and balance will give u ur 3076. You could try both and have it rebuilt and balanced as which ever u like. Gt30 is large enough to forgo the balance if journal bearing. I do t have enough experience with the ball bearings to say. I have put 20-30k miles on a unbalanced dom3x. (3076r) and good so far. I will balance it at some point.

3071 would meet ur goal, u have to run it a bit harder so better supporting mods would help. 3076 can do it with a less optimal tune/setup.
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Old 07-28-2022, 02:42 PM   #18
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I'm running a gen2 gtx3076r. I got the block cleaned up for the head gaskets, picking the heads up tomorrow. Can anyone confirm if I'll be fine running a stock head gasket with 6 thousands of an inch taken off the heads? .012 is the limit right?

Last edited by Mauled; 07-28-2022 at 03:09 PM.
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Old 07-30-2022, 10:14 AM   #19
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Old 07-30-2022, 08:42 PM   #20
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Got one of the heads on before work. The arp 625s say to.thread them in hand tight in the block. I cleaned all the threads but one of the studs would not go in by hand, I had to torque it down with the Allen. I put a level on them and made sure they are all at the same height in the block. Used stock thickness gaskets with copper spray, cut .006 off the head surface. Wonder what my cr will be. I hope I did this right. Going to order the rest of the parts I need this week and hopefully it will be running in a week or two. Think I can push 28psi out of the stock version 8 bottom end?

BTW guys this is a ebay gtx3076r. My last 3076 turbo I paid $100 for and beat 530 wheel supercharged camaros on stock 2005 wrx tranny. This one is dual ball bearing and billet wheel. We'll see what it can do.

https://www.ebay.com/itm/174009251405?hash=item2883c2764d:g:tMEAAOSwT~hdY2c v&amdata=enc%3AAQAHAAAA8CH5OxPEyLb0i60eYMtgVzCpB8h nv6Ry9YpwfTTgQEwkWoStzYVCeSrKIAo7U3XqZSZt%2BdCmXog 5w7gRDkM9QjVGnUZeFhDlXuBWYUKCr0o%2BWgN8MHJUtB%2FiS IJxSuj04MoD%2BiG6cKPvnTKoIWHw2%2FHhmqKFN65RJN9xrVK wxdym2PJCq%2FpseAFtlxpqMxc9t4Og6hxi%2BrfgGhhpdXnON r1uO27RYTg3RIjjSTpLFEdlxjBKV4mtbTjMsZ44bKuehYI5Kf6 5baFkVQvx1v2HssF5xpoK0mMmI4GG%2FuK149MeWaz4l5SurBv tBvVw5fUwag%3D%3D%7Ctkp%3ABFBM1r_Em8pg

Last edited by Mauled; 07-30-2022 at 08:47 PM.
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Old 08-18-2022, 10:59 PM   #21
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I got the engine back together but I'm having a problem with the timing. I did the timing belt and each mark on the belt lined up perfectly with the cam gears and the marks on the timing cover.

But when I pulled the pin and spun it around, the cam gear marks don't line up perfectly. Looks like all of them are 1 tooth off. I pulled the belt off and tried again with the same result. Timing is perfect upon pulling the pin, but as soon as I crank the engine over by hand they never line up the same as before I crank it.

My heads were decked .006" and I used the stock thickness gasket. I'll try to post pics tommorow, but do you guys think it will be safe to run like this?
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