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New Engines: 557 or 572

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Old 10-17-2006, 09:50 PM
  #41
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Default Re: New Engines: 557 or 572

Which bore 4.5 or 4.6 has less head gasket issues?
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Old 10-17-2006, 09:51 PM
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Default Re: New Engines: 557 or 572

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Originally Posted by GPM
Which bore 4.5 or 4.6 has less head gasket issues?
4.5
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Old 10-17-2006, 09:52 PM
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Default Re: New Engines: 557 or 572

Its a gen 5 merc 93 or 94 I forget . 502 390hp merc.
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Old 10-17-2006, 09:55 PM
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Default Re: New Engines: 557 or 572

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Its a gen 5 merc 93 or 94 I forget . 502 390hp merc.
If it's the light weight block you might not want to use it.
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Old 10-17-2006, 09:56 PM
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Default Re: New Engines: 557 or 572

Is the 4.25 the stock crank and I would change the stroke and pistons only. to get 548?
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Old 10-17-2006, 10:00 PM
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Default Re: New Engines: 557 or 572

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220-221, whatever it takes!
Hey that's my saying.
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Old 10-17-2006, 10:05 PM
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Default Re: New Engines: 557 or 572

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Originally Posted by AIR TIME
Is the 4.25 the stock crank and I would change the stroke and pistons only. to get 548?
The stock stroke is 4 inch.
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Old 10-17-2006, 10:16 PM
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Default Re: New Engines: 557 or 572

Out of one of my 598's.Just a small leak in a header is a real bad thing.
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Old 10-17-2006, 10:24 PM
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Default Re: New Engines: 557 or 572

wow and thanks for the the ED
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Old 10-17-2006, 10:34 PM
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Default Re: New Engines: 557 or 572

Quote:
Originally Posted by GPM
Which bore 4.5 or 4.6 has less head gasket issues?
I heard that the cometic gaskets have eliminated most head gasket issues.
What RPM's are most builders comfortable with on a 4.5 stroke 1000+ hp motor. For sustained length runs.
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