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Originally Posted by MILD THUNDER
(Post 4304357)
The nice thing about moving to a 4.500 bore, is the chamber can be modified easily to accomodate the larger bore, if it needs to be opened up.
You really dont want a head with a chamber for a 4.250 bore, on a 4.600 bore, and you def dont want a chamber for a 4.600 bore on a 4.250 bore block. Bolt the head on the bare block, turn it upside down and take a look. the camshaft will also dictate the rpm the engine will make its peak power, at least on an average 6000 RPM or less marine big block chevy. |
did the 489 see a dyno and if so what hp&torque did it make?
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The 489 has never seen a dyno.
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I think Im going to do the 540, I can always change the heads later without pulling the engine from the boat. You know what they say, no replacement for displacement!!!!!
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Originally Posted by bigbird241
(Post 4304530)
The 489 has never seen a dyno.
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if the 454 block is good i may be interested in it.pm me if you are going to sell it.
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ok, its a mark 4 that is punched .030 over
cylinder 6 has a nick in it from the broken valve, but shouldn't hurt performance |
i need one to go .060 over so yours will work for me.
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Originally Posted by mike tkach
(Post 4304571)
i need one to go .060 over so yours will work for me.
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