Do BBC's make way more HP then BBF's??? - 460 Ford Forum
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post #1 of 97 (permalink) Old 05-29-2010, 10:36 AM Thread Starter
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Do BBC's make way more HP then BBF's???

I while back i was asking if a 900hp pump gas BBF was possible and i was told to forget about it wasn't practical (even with ported A460 heads, Trickflow TR w/1050's) but doing some research i've noticed that there are lots of 900hp pump gas BBC's out there, most are 550-572 c.i. with "out of the box" heads with a mild clean-up on them and a single carb. The heads used are said to be about 400cfm standerd port stuff. These pump gas BBC's seem to be com'ing from the same builder and same dyno shop. So are BBC's that much better for making big hp on pump gas or are the engine builder and dyno shop full of ****?
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post #2 of 97 (permalink) Old 05-29-2010, 10:56 AM
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post #3 of 97 (permalink) Old 05-29-2010, 11:39 AM
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So are BBC's that much better for making big hp on pump gas or are the engine builder and dyno shop full of ****?


where i`m there has been people that claimed this before and the number at the track told a different story . the best i seen the baddest pump gas big chevy go around here was low 10`s thats a bit far off the numbers. magic dyno`s and the fastest credit card machine around.
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post #4 of 97 (permalink) Old 05-29-2010, 11:42 AM
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Quote:
Originally Posted by Filucky View Post
I while back i was asking if a 900hp pump gas BBF was possible and i was told to forget about it wasn't practical (even with ported A460 heads, Trickflow TR w/1050's) but doing some research i've noticed that there are lots of 900hp pump gas BBC's out there, most are 550-572 c.i. with "out of the box" heads with a mild clean-up on them and a single carb. The heads used are said to be about 400cfm standerd port stuff. These pump gas BBC's seem to be com'ing from the same builder and same dyno shop. So are BBC's that much better for making big hp on pump gas or are the engine builder and dyno shop full of ****?
"Out of the box" heads and over 400 cfm doesn't correlate ... unless the heads are NOT production port location heads.

A simple look at the "GM Performance Parts" 572 crate motors for pump gas will give a TRUE indication of what Chevy has to offer on a "big motor" production type platform...

If you want to listen to Bull $hit, I can tell you that all day long and it still won't make it an actuallity.

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post #5 of 97 (permalink) Old 05-29-2010, 12:01 PM
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Practical and possible are 2 different things all together!!! I asked for advice on a 650hp pump gas engine and alot of people kept saying I needed 13:1 compression and wasn't practical but I am happy to say it is possible. Kaase built a 512 I believe it was, several years ago that made 812hp on 93 octane with ported A429 heads. I don't think it is likely with otb heads though.

PS I even had one guy accuse me of being a street racer which I am not and don't approve of it at all. I just don't want to spend $7/gallon on racing gas in a dual purpose vehicle. 900hp is not a dual purpose engine though.

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post #6 of 97 (permalink) Old 05-29-2010, 01:21 PM
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I build ALL brands and I have built six Chevrolet big block engines with that kind of power using pump gas and mostly "out of the box" parts; for "Offshore Pleasure" boats.

It was NOT even close to "standard port stuff".

1. 604 cubic inches; first class rotating assemblies
2. 9.7/1 compression ratio
3. 18 Dart "Big Chief" heads
4. Cast Dart tunnel ram manifolds
5. Two #8896 Holley Dominators
6. "Middle of the road" Marine roller camshafts.
7. Gil Marine wet sump oil pans.
Made 1,000 horsepower however, it also cost about $17,000.00 each in the end; in the mid 90's.

EDIT: Possible and practical depends upon how deep your pockets full of money are.

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post #7 of 97 (permalink) Old 05-29-2010, 01:46 PM
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Build for 600 hp, then spray the remaining 300-400 with NOS!!.....WHAM!!...instant 900 hp!!

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post #8 of 97 (permalink) Old 05-29-2010, 02:01 PM
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Out of the box , AFR std. port BBC heads can flow 400cfm . not said in the OOTB claim by the buyer --is they are c n c ported .
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post #9 of 97 (permalink) Old 05-29-2010, 02:34 PM Thread Starter
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Heres a video i ran across, 572 BBC, RHS heads, single carb on 91 pump gas, 885hp. They claim it is all very simple bolt on ready parts.

http://www.youtube.com/watch?v=8av5_ln60BI
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post #10 of 97 (permalink) Old 05-29-2010, 02:47 PM
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I just finished a Big Chevy project for a customer. 582 cubic inches, AFR 335 runner heads and a mild roller cam with a little over .700 lift. It's for his jet boat and it's 10:1 compression and intended to make maximum horsepower at about 5800rpm. It makes 700 horsepower at that rpm and 700lbs/ft torque and it's taken his boat to 99.1 mph with two people and 18 gallons of gas.

Getting it to make 700 horsepower at below 6000rpm and with a cam this mild was NOT easy. The heads flowed 405cfm at .700 lift and were worth about 50 horsepower over a set of heavily ported(not by me) Merlins.

Most of the off the shelf/out of the box Big Chevy heads are not very good and that's a FACT. What's really interesting is that one of his buddies has a 598 that supposedly made 860 horsepower yet it only runs about 90 in a nearly identical boat. Maybe it does make that power but in order to do so is probably spinning 1000 more rpm and that's not practical in a jet boat that's truly a cruiser.

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post #11 of 97 (permalink) Old 05-29-2010, 04:19 PM
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good time to quote Seth's 557 build again, me thinks:

Dyno Numbers: Finally made a little progress. Updated with dyno results!!!

Build Thread: Finally made a little progress. Updated with dyno results!!!
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post #12 of 97 (permalink) Old 05-29-2010, 04:47 PM Thread Starter
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good time to quote Seth's 557 build again, me thinks:

Dyno Numbers: Finally made a little progress. Updated with dyno results!!!

Build Thread: Finally made a little progress. Updated with dyno results!!!
Thats a very nice build for sure, but keep in mind those are "raised port" race heads and it still fell 70hp short of 900hp on 80% pump gas, But i do have a feeling Seth's 557 would out pull most of these 900hp BBC's on a "good" dyno.
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post #13 of 97 (permalink) Old 05-29-2010, 04:53 PM
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what builder you reference is building those 900hp BBC's? Got a link?
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post #14 of 97 (permalink) Old 05-29-2010, 05:03 PM Thread Starter
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Quote:
Originally Posted by rmcomprandy View Post
I build ALL brands and I have built six Chevrolet big block engines with that kind of power using pump gas and mostly "out of the box" parts; for "Offshore Pleasure" boats.

It was NOT even close to "standard port stuff".

1. 604 cubic inches; first class rotating assemblies
2. 9.7/1 compression ratio
3. 18 Dart "Big Chief" heads
4. Cast Dart tunnel ram manifolds
5. Two #8896 Holley Dominators
6. "Middle of the road" Marine roller camshafts.
7. Gil Marine wet sump oil pans.
Made 1,000 horsepower however, it also cost about $17,000.00 each in the end; in the mid 90's.

EDIT: Possible and practical depends upon how deep your pockets full of money are.
Were the "big chief" heads some of that "out of the box" stuff? Wasn't a set of fully ported big chief heads flowing around 470-480cfm? seems like they were kinda between a A460 and a C460 if i remember right, but i really dont keep up on the BBC stuff.
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post #15 of 97 (permalink) Old 05-29-2010, 05:26 PM Thread Starter
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what builder you reference is building those 900hp BBC's? Got a link?
DNE out of CA and they dyno there stuff at Westech dyno. They also built a 565 BBC pump gas deal with a single carb and it was dyno'd @1050hp. I just find it a little bit funny that one engine builder and this one dyno shop can keep turning out numbers that just isn't being done around the rest of the country, but maybe the're just that good?
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