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509 or 540

Old 12-31-2007, 07:45 AM
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I want to repower 1990 27 datona but dont know witch to go with i have merlin 320 heads & intakes gil exhust anyone tryed ohio crank short blocks & witch cams to use - twin engines
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Old 12-31-2007, 07:53 AM
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Originally Posted by itbs
I want to repower 1990 27 datona but dont know witch to go with i have merlin 320 heads & intakes gil exhust anyone tryed ohio crank short blocks & witch cams to use - twin engines
What short blocks are in your boat now?
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Old 12-31-2007, 10:25 AM
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30 over 454s
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Old 12-31-2007, 10:41 AM
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If you are going to go blown go with the 509 if you want to go na go with the 540.......Each are real easy to get 650 -700 hoarse power
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Old 12-31-2007, 11:00 AM
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Originally Posted by itbs
30 over 454s
If they are 4 bolt engines you can buy high quality rotating assemblies for around 1800 each and punch them to .060 over. THat will make you a 496. Buy the pistons for 8-1 static. Use everything else that you all ready have. Maybe upgrade the fuel pumps if you havn't all ready. Add small blowers with 5-7lbs of boost and you will easily get 6-650hp for a lot less money.

Rotating assemblies 1800 each
Weiand 177 blowers - 2000 each

That will cost you less than ordering short blocks for the same outcome and they will make gobs of torque.

Just my .02 if you are on a budget.

If you want short blocks, call Scott at Dyno Flow and he'll sell you 572-598 short blocks for the same price as most guys sell a 540.
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Old 12-31-2007, 11:07 AM
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want to stay na and short deck 9.8 blocks
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Old 12-31-2007, 11:19 AM
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Originally Posted by itbs
want to stay na and short deck 9.8 blocks
You can do 572" NA with a really small cam and get in the high 6's low 700hp's with the heads and intakes you have all ready.

I have done somw very similar all ready.

GL with your project. What kind of boat did you say they were going into?
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Old 12-31-2007, 11:36 AM
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i built a pair of 496's na not the merc 496 but a 60 over bore with a 4.25 crank in a 454 block and made 640 and 6000 a 496 will make more power then a 509 eather way
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Old 12-31-2007, 11:36 AM
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What is your definition of small cam? HP500cam or Crane -731 or bigger?
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Old 12-31-2007, 11:47 AM
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Originally Posted by mikes280
i built a pair of 496's na not the merc 496 but a 60 over bore with a 4.25 crank in a 454 block and made 640 and 6000 a 496 will make more power then a 509 eather way
Crank is longer
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