Engine Weights SBC-vs-BBC-vs-BBC - Chevelle Tech
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post #1 of 58 (permalink) Old May 4th, 13, 9:25 PM Thread Starter
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Engine Weights SBC-vs-BBC-vs-BBC

Here's how the weights compare between the 3 motors I weighed. Strictly for reference. The sbc is a Dart-IE block with raised runner Brodix 18° heads and aluminum pan. The 496 is a production 2-bolt block with 781 ovals and Milodon steel pan, and the 548 is a GM Gen-4 block with Dart-IE heads and Moroso steel pan. All were measured dry. The 496 had an empty oil filter and flexplate mounted, the other 2 did not.

496bbc:


440sbc:


548bbc:
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post #2 of 58 (permalink) Old May 4th, 13, 10:43 PM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

what do you think accounts for the additional weight of the 548?
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post #3 of 58 (permalink) Old May 4th, 13, 11:08 PM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

So these are both iron headed big blocks?

Last edited by BBC71Nova; May 5th, 13 at 12:15 AM.
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post #4 of 58 (permalink) Old May 4th, 13, 11:09 PM Thread Starter
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Quote:
Originally Posted by -SS454- View Post
what do you think accounts for the additional weight of the 548?
Heads & block would be my guess.
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post #5 of 58 (permalink) Old May 4th, 13, 11:17 PM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Quote:
Originally Posted by JOHN WILSON View Post
Heads & block would be my guess.
I think he was asking about the difference between the 496 and 548.

So if aluminum heads save a minimum of 80 pounds on a BBC, that would put the BBC within 40 lbs of the SBC.

Not much difference.

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post #6 of 58 (permalink) Old May 4th, 13, 11:19 PM Thread Starter
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Both bbc's are iron heads/block. Sbc is alum head/iron block.
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post #7 of 58 (permalink) Old May 4th, 13, 11:19 PM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Thanks John. Interesting....

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post #8 of 58 (permalink) Old May 5th, 13, 12:19 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

So aluminum block and heads would knock those BBC setups down another 100-150lbs I guess? Gotta go figure out how much an LS3 weighs now...
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post #9 of 58 (permalink) Old May 5th, 13, 12:25 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

John
Who's scale is that?
I like it a lot better than my platform one,, have to lift the stuff to set in on mine anyway,, might as well weigh it hanging there instead of dragging out the platform..

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post #10 of 58 (permalink) Old May 5th, 13, 12:26 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

So then an aluminum-headed bigblock should likely weight less than an iron-headed smallblock by this method of thinking, right? If not at least very close to the same then...

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post #11 of 58 (permalink) Old May 5th, 13, 1:46 PM Thread Starter
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Regarding bbc vs sbc weights. I can't really say what a different combo would weigh. I just put these out there for folks to see. Some things to keep in mind are the 548's block is a 4bolt Bowtie block that is likely heavier than a production 2bolt block, the Dart-IE heads likely weigh more than the GM 781's. That's where the weight difference is between the 548 and 496 (most of it anyhow). On the 440sbc, the Dart-IE block is a heavy piece especially compared to a production Gen-1 block. The heads are raised runner units that will weigh more than a typical 23° alum head, along with the intake being heavier. I would speculate that a typical production block 406 with Al heads would weigh-in ~40-50lbs lighter than this 440.

Quote:
Originally Posted by Wolfplace View Post
John
Who's scale is that?
I like it a lot better than my platform one,, have to lift the stuff to set in on mine anyway,, might as well weigh it hanging there instead of dragging out the platform..
Mike, not sure who makes it. I picked it up on ebay for ~90 bucks IIRC. It's rated to 1000lbs and gives repeatable numbers. Pretty nifty for the money, IMO.
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post #12 of 58 (permalink) Old May 5th, 13, 2:52 PM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Just weighed a couple myself the other day, 660 lb scale from ebay for $60.

Bare Pontiac 400 block 177 lbs.

One piece seal 880 block
355 Iron head Vortec
RPM Intake Iron water pump with pulleys
153t flexplate
MSD ignition
5qts oil
Cart without casters
453.8 lbs




OEM 400 block w/splayed caps
18x Heads 1801 intake
Aluminum water pump
Balancer and 153t flexplate
No oil or Distributer
Cart with casters
454.2 lbs

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1970 Chevelle 496- 10.2:1, 781 ovals, 3.31, 275/60 DR 3800lbs, 10.92@124.7 on 91 octane - Hers
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post #13 of 58 (permalink) Old May 6th, 13, 12:56 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

Here's one that weighs up to 1100 lbs and is about $80 :

http://www.ebay.com/itm/Digital-Hang...item564e489984

I think I'll get one

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post #14 of 58 (permalink) Old May 6th, 13, 8:48 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

nashville beth, if you make an offer that's accepted, ping me, I think I'd like to have one of those as well. I ship a good bit of stuff overseas, sure would help to be in the ballpark on weights. Past sales are for listing price, I guess nobody made a decent offer.

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post #15 of 58 (permalink) Old May 6th, 13, 9:32 AM
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Re: Engine Weights SBC-vs-BBC-vs-BBC

For $80, not even argueing over it. Got one coming.

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