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Would you mill an ecotec head?

Old 07-01-2015, 11:56 PM
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oh hai
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Old 07-02-2015, 12:06 AM
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This was my face when I read your PM
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Old 07-02-2015, 12:10 AM
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you can pay me more if you want haha. I can also autograph the cut ends for an extra 5 bucks a cam
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Old 07-02-2015, 12:13 AM
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Lol. I wonder how well sharpie stands up to being bathed in oil I'm curious how the car would run NA with those cams. Probably like **** but it'd be interesting to try it out.
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Old 07-02-2015, 12:17 AM
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I will have some valve-springs for sale soon as well. performance autowerks springs. installed in my ported head, but haven't been run yet. I got those on black Friday, so will let those go cheap as well
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Old 07-02-2015, 12:34 AM
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Hmmmmmm... Well I just got some zzp 82# springs and the Kent Moore tool but I could maybe use those for my other head. Depends on price though.
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Old 07-02-2015, 12:41 AM
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i remember that thread. you got that tool and those springs for nothing
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Old 07-02-2015, 12:50 AM
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Originally Posted by 07blackg5 View Post
i remember that thread. you got that tool and those springs for nothing
Yup! Now I'm considering:

1:Install spare head with stock cams and ZZP springs. Delete balance shafts for 8000rpm fun. Save money for SC completion.

2:While saving for SC/forged bottom-end ****, be porting the head that's on the car now a little more radically than this one and add the ZZP cams and whatever other springs I come across (Except the supertech ones)

3: Remove NA head and install 2.8 SC kit + aggressively modded head + forged bottom end.

4: Sell NA head to fund future mods, advertising whatever HP the car put down with it.
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Old 07-02-2015, 01:01 AM
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why do you say except supertech?
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Old 07-02-2015, 01:05 AM
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and i fell like stock cams will fall on their face well before 8k lol
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Old 07-02-2015, 01:20 AM
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Lsj cams dont have overlap=bad for na because you need the exhaust flow to help pull the intake charge in.

Wanna know a secret? Gen1 l61 cams have the same specs as lsj cams but the have different overlap for being na. Should run those.
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Old 07-02-2015, 01:39 AM
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Originally Posted by 07blackg5 View Post
why do you say except supertech?
They fit poorly and some have had issues with them causing valvetrain-related failures in other platforms.
Originally Posted by 07blackg5 View Post
and i feel like stock cams will fall on their face well before 8k lol
Oh, stock cams in my car fall off at like 6800rpm lol. I'm hoping the porting will at least minimally help with that.

Originally Posted by Slowbalt2000 View Post
Lsj cams dont have overlap=bad for na because you need the exhaust flow to help pull the intake charge in.

Wanna know a secret? Gen1 l61 cams have the same specs as lsj cams but the have different overlap for being na. Should run those.
I thought they were identical except the timing of the cams were slightly different, which could be adjusted with cam gears. Honestly I'd love to have a 2.4 car to molest the cam tables on But I'd like to make some 2.2 power first.
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Old 07-02-2015, 01:43 AM
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Hey 07black, is it these you have?

The Home of WERKSracing products!
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Old 07-02-2015, 01:46 AM
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Originally Posted by supernovanator View Post
They fit poorly and some have had issues with them causing valvetrain-related failures in other platforms.

Oh, stock cams in my car fall off at like 6800rpm lol. I'm hoping the porting will at least minimally help with that.



I thought they were identical except the timing of the cams were slightly different, which could be adjusted with cam gears. Honestly I'd love to have a 2.4 car to molest the cam tables on But I'd like to make some 2.2 power first.
Yeah you could run adjustable gears
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Old 07-02-2015, 02:00 AM
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Originally Posted by supernovanator View Post
Hey 07black, is it these you have?

The Home of WERKSracing products!
yes
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Old 07-02-2015, 02:07 AM
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Sweet. Let me know when you have them for sale.
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Old 07-02-2015, 10:24 PM
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Information bump: Roush built a 143" ecotec with 325hp NA, which is close to 240whp in an automatic maybe? They used a cam with .591" of lift on both sides. If I buy adjustable cam gears I suppose I don't care what the lift is or how much I shave the head. Plus since the exh/int cams are separately geared, I could theoretically reduce or increase the lobe separation angle(overlap) as I see fit for NA or blower.
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Old 07-02-2015, 10:47 PM
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That sounds beast for a manual car. Is there full build specs posted?
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Old 07-02-2015, 11:38 PM
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Would you mill an ecotec head?

I believe there are specs for that in the ecotec build book
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Old 07-02-2015, 11:40 PM
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Originally Posted by Slowbalt2000 View Post
That sounds beast for a manual car. Is there full build specs posted?
Not a thorough list of information. It had forged internals, including the crank. No word on compression ratio or cam timing, or what they did to the head to accept that kind of lift, plus it had a one-of-a-kind intake manifold and header. Here's the cam specs from COMP's website, underlined in red:

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Here's the complete article from the GM build book:

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Old 07-03-2015, 01:43 AM
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Probably not even worth trying to build lol. Ill stick to boost
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Old 07-03-2015, 01:56 AM
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Originally Posted by Slowbalt2000 View Post
Probably not even worth trying to build lol. Ill stick to boost
I'm going to try to get as close as I can. New goal: break a rod or piston NA. Really all the other **** isn't required. It's all in the head, cams, and tune. I already have a good excessive intake and exhaust.
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Old 07-03-2015, 04:28 AM
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I wonder if the na cars still suffer from lifter collapse at high rpm. Youd have to have a worked ass head to make over 300 and rev the **** out of it. Probably 10k or more.
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Old 07-03-2015, 04:28 AM
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They also had a 2.4 but you can build a motor bigger than that, itd definitely help the most
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Old 07-03-2015, 10:57 PM
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Originally Posted by Slowbalt2000 View Post
I wonder if the na cars still suffer from lifter collapse at high rpm. Youd have to have a worked ass head to make over 300 and rev the **** out of it. Probably 10k or more. They also had a 2.4 but you can build a motor bigger than that, itd definitely help the most
I can't run 10krpm on the stock ECM lol. Plus that's not really where I want to go with this. Honestly I could just swap in a 2.4 but I want to keep this as an inspiration to those L61 guys out there. See how close I can get. If I can get 200whp close to sea level I'll be happy. If I get more, that's great. If I get less, I didn't try hard enough. Still no word from NWAE on PTV clearance. If it wasn't a huge pain in the ass I wouldn't mind getting the info from anyone willing. I would really like to have a spare short-block to experiment with cam timing. Especially with 07blackg5's cams. I feel that I could play with cam timing and make them acceptable for a NA build.


I already have the balance shaft delete blanks from OTTP so those would go in with the NA head swap. Going to use the .027" head gasket to put me at 11:1 compression. Would really like at least the front wheels to be RPF1. I was recently recommended to a machine shop for the headwork so I'll go see how much it costs and document everything. Maybe make a results thread when I'm done so people don't have to wade through tons of comments.
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