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What kind of hp gain from gm847?

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Old Jan 24, 2005 | 11:41 AM
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Kurt Crosbie's Avatar
Kurt Crosbie
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What kind of hp gain from gm847?
i'm currently running a cc305.

I was just told by a source that i would pick up 15-20hp
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Old Jan 24, 2005 | 12:01 PM
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sssalah
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Re: What kind of hp gain from gm847?
The 847 is 234/242 I believe vs. 220/230 for the 305, I would think you'll pick up more than 20hp if your heads can flow enough.
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Old Jan 24, 2005 | 02:55 PM
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Kurt Crosbie
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Re: What kind of hp gain from gm847?
they are stock ported heads. basically just cleaned up and matched to the intake. maybe 15-20cfm over stock
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