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Low Ratio BBC Rockers

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Old 04-04-2008, 12:16 PM
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I agree on the not wanting to run it at that RPM without a load on it causing the washdown...

Please don't think I am disagreeing with you on the spring pressure issue because as you already know I hold your experiance , reputation , opinion & help in high regaurd... But I am curious as to not worrying about the spring pressure issue ? I am not one of those people that believe everything I read or hear & I know that the cam companys like to cover there butts esp. with the issues they have had over the last few years... I just know that I have always heard & followed that aound 120-130# on the seat was the cutoff for break in... Just courious as to your thinking behind that ? & like I said your opinion is held high & thats why I am asking... I am always willing to learn , esp. from good sources !!
I always learned that it was the open pressure that is the killer, but I would like to know what Dean has to say.
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Old 04-04-2008, 12:22 PM
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I always learned that it was the open pressure that is the killer, but I would like to know what Dean has to say.
Same here , I believe that its somewhere around 320# orso on the open that most recomend as max & that was my main reason for looking for the low ratio's b/c it would keep my preasure below that during break in.
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Old 04-04-2008, 01:24 PM
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Same here , I believe that its somewhere around 320# orso on the open that most recomend as max & that was my main reason for looking for the low ratio's b/c it would keep my preasure below that during break in.
As long as you flatten it out before you put it in the boat, you can always cahnge it.
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Old 04-05-2008, 11:21 AM
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As long as you flatten it out before you put it in the boat, you can always cahnge it.
Like to think ahead huh !

Just cheacked & my pressures are 140 on the seat & 330 open
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Old 04-05-2008, 11:46 AM
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Like to think ahead huh !

Just cheacked & my pressures are 140 on the seat & 330 open
I've got one that was broken in on 150 seats. and after a couple hours I am running it on 190 seats and 500 open.

Those cams are a lot more resilient than people give them credit for.

I have found that it is most often the camshaft being defective.

I can only remember 1 in the laast year out of anyone that I know that uses them that has killed one. And that was me.

Had a bad carburator and couldn't get the thing to run until it was to late.

You'll be fine.
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Old 04-05-2008, 03:19 PM
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I've got one that was broken in on 150 seats. and after a couple hours I am running it on 190 seats and 500 open.

Those cams are a lot more resilient than people give them credit for.

I have found that it is most often the camshaft being defective.

I can only remember 1 in the laast year out of anyone that I know that uses them that has killed one. And that was me.

Had a bad carburator and couldn't get the thing to run until it was to late.

You'll be fine.
Thanks , That does make me feel a bit better. Like I said I have never had a problem but I just wnat to make sure I cover all my bases...

Btw : You have a sweet magnum , As you may already know I am a huge fan of the classics myself !
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Old 04-06-2008, 02:06 PM
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Thanks , That does make me feel a bit better. Like I said I have never had a problem but I just wnat to make sure I cover all my bases...

Btw : You have a sweet magnum , As you may already know I am a huge fan of the classics myself !
I have been running it with an engine that I had in the shop, but I am building a really nasty 468 blower motor for it.

250 blower, twin 750's, chiller, 7.6:1 dished pistons, 1/4 long rods, 4" crank. 242/250 .680 lift solid roller cam on 112+4, edelbrodk marine aluminum heads, all the regular highe dollar chit.

I have most of it laying around that I hadn't been able to sell, so that stuff will have a home now.

Engine should make that boat cook pretty good.

Thanks for the compliment. Good luck with your project.
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