496 cu.in or 540.cu.in BBC. Will it make a big difference??? - Yellow Bullet Forums

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Old 11-09-2011, 02:49 AM   #1
protobuild
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Default 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Looking to build a new short block. Is there that much gain in moving up from a 496 to a 540 cu.in other than 44 inches. Already have cnc,d heads, Intake, new cam, fogger etc.
Help ?? before I break the piggy bank.
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Old 11-09-2011, 03:20 AM   #2
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

If had it to do over, I would spend the extra 1500-1700 for a 4.5 block and went 540.
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Old 11-09-2011, 03:30 AM   #3
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

agree^^^^^^^^^then its just a slug swap to go 555 or 565
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Old 11-09-2011, 10:40 AM   #4
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

.

Depends on the heads.


.
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Old 11-09-2011, 11:21 AM   #5
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Go for the 540. But like was said, you would probably need at least a 335 cnc head for it.
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Old 11-09-2011, 01:21 PM   #6
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Thank,s guys. The heads I have purchased is a set of canfield 320's ported by cfe. That was one of the limits I was in question about also. I was told they would work well on a 496 but rpm would have to move up to get them to work on anything smaller.
Thanks again for the input.
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Old 11-09-2011, 01:26 PM   #7
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

I will probably go with the bigger cu.in. build to save the expense of boring over the added cost of a 4.500 new block. Bore and hone (496) vs. just hone to size. ?
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Old 11-09-2011, 01:48 PM   #8
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

What block do you plan on running?
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Old 11-09-2011, 02:17 PM   #9
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Go with the 540 ! The best choice all the way
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Old 11-09-2011, 02:20 PM   #10
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Considering a dart block. But I am lookin for the best bargain that will still allow me some overbore and have enough wall thickness to be safe for a moderate power adder.
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Old 11-09-2011, 03:11 PM   #11
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

.

If you can afford a big bore block, you will have plenty of meat to start at 4.500 and work up for years, or it blows up.
With those heads, you will not gain as much as with a bigger head, at least I didn't, and I'm now trying to upgrade due to running out of air.
If I was doing a budget build, I would get the best small bore block I can afford, and start at 482" and have meat left over.

Good luck.

.
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Old 11-09-2011, 03:47 PM   #12
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Quote:
Originally Posted by protobuild View Post
Considering a dart block. But I am lookin for the best bargain that will still allow me some overbore and have enough wall thickness to be safe for a moderate power adder.
I agree with mrdragster go with the dart block,tune your shit safely and get lots of yrs service out of it!
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Old 11-09-2011, 07:45 PM   #13
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

If you're gonna spend the money for a Dart block I would go with the 4.500 bore block. Then you can make it just about any size you want from 509 to 598 by just swapping the rotating assembly. Buy the big bore block once, you won't be sorry you did. Good luck, keep us posted.
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Old 11-09-2011, 08:33 PM   #14
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Quote:
Originally Posted by protobuild View Post
Considering a dart block. But I am lookin for the best bargain that will still allow me some overbore and have enough wall thickness to be safe for a moderate power adder.

I would do a 532. JMO, but that combo has worked well for me.
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Old 11-09-2011, 08:49 PM   #15
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Default Re: 496 cu.in or 540.cu.in BBC. Will it make a big difference???

Go with the 4.500 bore. The cylinder heads will flow more on the larger bore size. The chambers in your heads are machined for a 4.500 bore as well.
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