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Old 10-05-2007, 02:55 PM   #1
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Big Block to small block.

How much agro would it be to swap a pair of 454 magnums for a pair of 350 magnums?

Are the drive ratio's the same or different?

Any advice allways appreciated, thanks.
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Old 10-05-2007, 04:58 PM   #2
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what drives?
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Old 10-05-2007, 05:23 PM   #3
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It's gonna be bravos.
Drives likely to be 1.5:1 for both.
I think it's a direct bolt in replacement
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Old 10-05-2007, 08:12 PM   #4
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Why? you will loose a load of torque is the boat light? to pop on plane
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Old 10-05-2007, 08:26 PM   #5
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Yeah, torque could be a problem.

Just looking at the options to make a boat comply with the Round Britain Class's.

Boat weighs approx' 2700kg's but is too big on engine capacity. Changing to small blocks would save 140kg's in weight. Only other option is to convert to diesel's but that would be very expensive.
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Old 10-05-2007, 09:10 PM   #6
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I went the other way with a 22' boat 350-450mag its is very straight forward, the only thing to check out is the bolt pattern on the output shaft donut as this differs as generations of engines changed.
The bellhousing and engine mounts should be a straight swap
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Old 11-05-2007, 01:33 AM   #7
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Why has Cap'n chaos have JF as his Avatar?
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Old 11-05-2007, 01:53 AM   #8
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Cos JF is Chaos's Hero, I guess.
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Old 11-05-2007, 02:05 AM   #9
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thats right Mr Turnip1, he most certainly is................i dream about him at night, cant concentrate at work & have even been known to call out his name when reaching a point of extacy whilst shaggin the mrs!

OR

I could just be avin a laugh
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