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Post  djfry460 May 25th 2022, 8:04 am

Good morning all,
I'm new to this board but not to engines in general. Had several BBF's over the years but nothing more than 500 HP.
Curious about when the build requires a raised cam block? Is it HP dependent or RPM based?
It would make sense for shorter pushrods and improved stability but i don't know where that "line" is....

thanks for any response to this.

Have a good day.

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Post  dfree383 May 25th 2022, 10:02 am

When you run out of crank to cam clearance.
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Post  wickettoby1 May 25th 2022, 12:33 pm

djfry460 wrote:Good morning all,
I'm new to this board but not to engines in general. Had several BBF's over the years but nothing more than 500 HP.
Curious about when the build requires a raised cam block? Is it HP dependent or RPM based?
It would make sense for shorter pushrods and improved stability but i don't know where that "line" is....

thanks for any response to this.

Have a good day.

That’s a Chevy problem with their measly 9.8” deck heights 😂

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Post  djfry460 May 26th 2022, 7:56 am

Sorry all, i meant at what performance level is it required and / or best practice?
i understand the physical limitations

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Post  rmcomprandy May 26th 2022, 10:19 am

djfry460 wrote:Sorry all, i meant at what performance level is it required and / or best practice?
i understand the physical limitations

"Physical Limitations" is the only reason it would be REQUIRED.

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Post  djfry460 May 26th 2022, 10:20 am

ok thank you

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Post  wickettoby1 May 26th 2022, 8:54 pm

You can’t swing a big stick in a small yard 😂

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Post  Paul Kane May 27th 2022, 2:00 pm

djfry460 wrote:Good morning all,
I'm new to this board but not to engines in general. Had several BBF's over the years but nothing more than 500 HP.
Curious about when the build requires a raised cam block? Is it HP dependent or RPM based?
It would make sense for shorter pushrods and improved stability but i don't know where that "line" is....

thanks for any response to this.

Have a good day.
This is a BBC problem.  Next to the BBC, the 385 Series is already "rasied cam" block as a matter of speaking.  There are no camshaft clearance issues with any of the common BBF stroker kits, not even with alumnum rods.
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Post  Paul Kane May 27th 2022, 2:10 pm

wickettoby1 wrote:
djfry460 wrote:
Curious about when the build requires a raised cam block?

That’s a Chevy problem with their measly 9.8” deck heights 😂
Deck height has nothing to do with it. In fact, aftermarket 385 Series blocks were once available in a shorter 9.75" (and even 9.30") deck height.

It's specifically the cam-to-crank centerline dimension of the BBC that is sometimes the issue.  The Ford 385 cam-to-crank centerline is 6.078" while the original BBC cam-to-crank centerline is just 5.152" (5.552" on the raised cam BBC cylinder blocks).
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Post  djfry460 May 31st 2022, 7:34 am

Thank you all for the information.

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