clearancing a bbc - 460 Ford Forum
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post #1 of 11 (permalink) Old 11-27-2010, 03:45 PM Thread Starter
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clearancing a bbc

When clearancing the rotating assembly in a bbc, how much needs to be ground out?

Does it just need enough room to pass by or like an 1/8" clearance?

Its a 496 kit in a stock short deck height block, with scat h-beam rods, scat crank.
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post #2 of 11 (permalink) Old 11-27-2010, 03:49 PM
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Hi, I think you are in the wrong forum.

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post #3 of 11 (permalink) Old 11-27-2010, 04:23 PM
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yea wrong forum but answer will apply to all engines.

Use a 1/16 wire to pass between the rods at the block pan rail.when the wire passes through you will have enough clearance.............ron

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post #4 of 11 (permalink) Old 11-28-2010, 12:49 AM
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Quote:
Originally Posted by tiger View Post
When clearancing the rotating assembly in a bbc, how much needs to be ground out?

Does it just need enough room to pass by or like an 1/8" clearance?

Its a 496 kit in a stock short deck height block, with scat h-beam rods, scat crank.
BBC?

STRING HIM UP!!!



Dave
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post #5 of 11 (permalink) Old 11-28-2010, 01:43 AM
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BBC?

STRING HIM UP!!!



Dave
about like PRO COMP
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post #6 of 11 (permalink) Old 11-28-2010, 01:25 PM
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"A engine does not know what the name is on the valve cover." A good engine builder can and does build other perfomance engines and he can use this knowledge , both the weak points and the strong ones, to inprove every build he does.

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post #7 of 11 (permalink) Old 11-28-2010, 02:56 PM
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Yep but could you imagine the ribbing he'd get going to a chevy forum and askin about a Ford.

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post #8 of 11 (permalink) Old 11-28-2010, 11:25 PM
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Wink

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post #9 of 11 (permalink) Old 11-29-2010, 10:32 AM
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Quote:
Originally Posted by tiger View Post
When clearancing the rotating assembly in a bbc, how much needs to be ground out?

Does it just need enough room to pass by or like an 1/8" clearance?

Its a 496 kit in a stock short deck height block, with scat h-beam rods, scat crank.
Mild, budget engine: if it clears, it clears.

Performance engines: measured 0.050"-0.060", mininum.

Techniques and opinions will vary,

Paul

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post #10 of 11 (permalink) Old 11-29-2010, 11:19 AM
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I just did a 496 for a customer using the Scat I beam rods and it required no griding at all to make it clear in an '80's 454 block. I think that Scat has slightly changed the shape of those rods because a few years ago I did a 505 for a guy and I had to do some grinding up by the cam area, I had to take out about .100 or so in most places.

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post #11 of 11 (permalink) Old 12-25-2010, 04:42 PM Thread Starter
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Got the rotating assemble put in. It rotated without hitting anything, but needed grinding on the cam side of the piston holes.

Thanks for the help guys.
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