Would you mill an ecotec head?
07-02-2015, 12:50 AM
#33
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.
07-02-2015, 01:20 AM
#36
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.
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.
07-02-2015, 01:39 AM
#37
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.
But I'd like to make some 2.2 power first.
07-02-2015, 01:46 AM
#39
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.
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.
07-02-2015, 10:24 PM
#42
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.
07-02-2015, 11:40 PM
#45
Here's the complete article from the GM build book:
07-03-2015, 10:57 PM
#50
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 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.
