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Old 04-27-2011, 09:54 AM   #1
chevymc350
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Default 540 BBC HP??????????

Well guys I have sold all the SB2.2 stuff and putting together a 540 BBC and was wonder with this combo any HP ideas? Was told that I will be shocked by the guy that gave me the combo, but he won't tell me how much power it will make until its done. Its my first Big Block so looking for some guestamites..... Here is the combo:

Dart Block......... 9.8 block
Bore ......... 4.500
Stroke ...... 4.250
Rods ......... 6.385
Compression...... 13.1-14.1ish
Heads ....... Brodix BP BB-3Xtra-O 365
FLOW: int.451 exh.295 @ .800
VALVES: 2.350/1.880
CHAMBER: 119cc
Intake ........ Brodix BM 2017-O
Cam ......... ADVERTISED DUR 326/338 LIFT .804/.755
DUR @ .50 285/295 LAC/ICL 114/112
Carb .......... 1250

It will be getting the spray but wondering what do you guys think before the spray???
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Old 04-27-2011, 10:44 AM   #2
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Default Re: 540 BBC HP??????????

My 540 had 12.7 to 1 with a tad smaller heads and cam made 820 hp and 710 tq. Would guess yours will make about 920-930 hp.
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Old 04-27-2011, 11:47 AM   #3
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Default Re: 540 BBC HP??????????

With those heads and cam you're going to have to twist the u-know-what out of it for probably not much more than you could get with smaller heads and less cam. It might make 900 or so. Don't know why you'd use such big heads and only lift .800".
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Old 04-27-2011, 12:23 PM   #4
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Default Re: 540 BBC HP??????????

Why sell the SB2 stuff, looking to slow down?
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Old 04-27-2011, 12:51 PM   #5
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Default Re: 540 BBC HP??????????

900-950hp
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Old 04-27-2011, 12:52 PM   #6
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Default Re: 540 BBC HP??????????

Quote:
Originally Posted by jmarkaudio View Post
Why sell the SB2 stuff, looking to slow down?
Maybe hes looking for a setup thats just as fast and lasts more than 25 passes.
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Old 04-27-2011, 01:09 PM   #7
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Default Re: 540 BBC HP??????????

Quote:
Originally Posted by c6_tt View Post
Maybe hes looking for a setup thats just as fast and lasts more than 25 passes.
That's what I was thinking as well.
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Old 04-27-2011, 01:39 PM   #8
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Default Re: 540 BBC HP??????????

With some more lift I would hope that thing could make over 1000hp easily.. especially if them headflow numbers are true. I would hope the builder aims for the higher side of the quoted compression ratio as well.

My old 565 had 357cc AFRs and a cam similar in size to that, 14:1 CR and it made 980hp.
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Old 04-27-2011, 02:31 PM   #9
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Default Re: 540 BBC HP??????????

chevymc350, how much power are you hoping for? Michael
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Old 04-27-2011, 03:06 PM   #10
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Default Re: 540 BBC HP??????????

Two seasons on the one in my brothers car, they don't have to be unreliable. Mine broke a cam, due to the core used and the way it was cut. I hope to get at least 3-4 seasons without doing anything major when it goes back together.
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Old 04-27-2011, 03:46 PM   #11
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Default Re: 540 BBC HP??????????

Quote:
Originally Posted by c6_tt View Post
900-950hp
X2
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Old 04-27-2011, 03:50 PM   #12
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Default Re: 540 BBC HP??????????

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X2
x4
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Old 04-27-2011, 07:16 PM   #13
chevymc350
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Default Re: 540 BBC HP??????????

I got rid of the SB2 stuff beacuse of the durability. Putting the money into a BBC that will last longer. I have rebuilt the SB2 three times in two and a half seasons and tired of doing it so I decided to go BB. My engine guy said to go with that cam because it will work great and wake up those heads on the spray. Loking to hit it with 250-300 shot.

@Scott-I was told the nitrous will work good with those heads since they flow soo much. We figured we will only have to spin it to 8000...lol so with spray it should be atainable, what heads will you suggest with that cam?

@Michael- I am looking to make 1000+ HP on motor.

@Matt- I was thinking of going with these cam specs also that he gave me the choice of
Advertised Duration (Int/Exh): 322/344
Duration @ .050 (Int/Exh): 286/304
Gross Valve Lift (Int/Exh): .817/.778
which will also work good with nitrous

@c6_tt- YOU ARE RIGHT, YOU HIT IT ON THE HEAD

Last edited by chevymc350; 04-27-2011 at 07:18 PM.
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Old 04-27-2011, 07:35 PM   #14
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Default Re: 540 BBC HP??????????

To make a 1k+ you need to .900+ lift and 14.5+ compression. Whey didnt you go 4.56 or 4.6 on the bore if you were starting fresh, you still would have room for a couple tuning mistakes.
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Old 04-27-2011, 07:42 PM   #15
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Default Re: 540 BBC HP??????????

I think a 1000+ will be a little hard to get.. needs more lift for the heads and I agree also, 8000+ RPM is what it will need.. Ditch that intake and get a sniper Jr or have the 2017 WELL ported..
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