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Old 12-09-2004, 02:58 PM
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Question Big Block

On a 1999 454 mpi with 200 hrs. What should the compression be?
How many HRS. should it be good for, on average? More than a 1000 or less?
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Old 12-09-2004, 03:03 PM
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Default Re: Big Block

I think your compression should be around 150 psi. My 454 Mag puked after about 550 hours. Keep an eye on your riser/manifold gaskets. That's what killed mine. I ran in salt a lot and ran hard.
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Old 12-09-2004, 03:24 PM
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Default Re: Big Block

150-160 psi
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Old 12-09-2004, 11:51 PM
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Default Re: Big Block

Consistent numbers among cylinders is important too.
Don't be alarmed to find 140s.
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Old 12-10-2004, 08:34 AM
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Default Re: Big Block

Should the motor be at temp. when checking?
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Old 12-10-2004, 01:05 PM
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Default Re: Big Block

Quote:
Originally Posted by CROWN MAN
Should the motor be at temp. when checking?
Yes, and throttle at wide open.
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Old 12-10-2004, 02:19 PM
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Default Re: Big Block

So the motor at temp then W-O-T then check?
I`ve never heard about the throttle. what does it do?
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Old 12-10-2004, 02:39 PM
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Default Re: Big Block

If the throttle's not open, air can't get in. If air can't get in, it can't get into the cyliders to compress.
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