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Old 06-12-2010, 09:10 AM
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What takes less time, springs or heads

Heres the deal, I got a 30k Goodwrench style engine that would onlt rev to 4500 rpm or so.
So I swaped the cam for the 350hp L79, 222/222, .447/.447 lift.
Dang engine will still only rev to 4500. So I bought some Z28 valve springs with the idea that it would fix the valve float that I think I've got . But it seems like a majot PIA to change each spring one at a time. I'm wondering if it would be easier and less time to have the Z28 springs put on some 305 heads I've been backyard porting and change the heads . I've never changed valvesprings before so I don't know.

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Old 06-12-2010, 10:00 AM
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Stuff to check first

Is your cam setup correctly.
Was the cam broken in & did you use new lifters as well.
Did you properly adjust the valve lash.
What kind of exhaust system do you have.

It would kinda appear to me that you have some other issue if a cam change did not change the motor's performance even a wee bit.
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Old 06-12-2010, 10:53 AM
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Quote:
Originally Posted by DENCOUCH
Is your cam setup correctly.Yes 40min, 2500rpm
Was the cam broken in & did you use new lifters as well.
Yes , new
Did you properly adjust the valve lash.Yes,1/4 past zero
What kind of exhaust system do you have.
Basically stock wiuth .082 hotside on turbo, 2" crossover.[/B]3" down pipe.

It would kinda appear to me that you have some other issue if a cam change did not change the motor's performance even a wee bit.
[B]It pulls harder but stiull only to 4500rpm. I was hoping for 5800rpm.
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Old 06-12-2010, 11:12 AM
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Heres the kit. I swapped ignition systems to thinking the boost might be blowing out the spark, that wasn't it. Gaps at 28 thou. I have a ramhorn exhaust manifold on the drivers side.
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Old 06-12-2010, 12:04 PM
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For me it is a lot easier(and cheaper) to change the valvesprings than it is to change complete heads, which will require more gaskets and more time disassembly and reassembly.

An on-the-head spring changing tool is inexpensive and simple enough to use, and will take much less time to do springs one at a time than it will to completely change heads.

Valvesprings would be what I would expect to be the problem, as long as you are sure you aren't running out of fuel(inadequate pump or line size). Have you checked fuel pressure at the point the engine goes flat??

Does it go flat at 4500 rpm in every gear? = valvesprings
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Old 06-12-2010, 02:27 PM
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I checked the fuel pressure. It's good. Does it in every gear, including park.
I was trying to avoid buying the $80 Moroso valve spring tool. The one from autozone tool loan program was a POS and my prybar type chews up the threads on the studs. I just managed to fix that problem with a brass sleeve and a little grinding on the prybar. Tomorrow i'm changing the valvesprings. The only other cause I can think of is that there is too much pressure in the 2" turbo exhaust sytem.
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