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02-28-2011, 04:46 PM
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#1 |
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Registered User
 
Join Date: Dec 2009
Location: Voorhees NJ
Posts: 188
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My daily driven BBC
I am planning on building a daily driven BBC for my 71 longbed. I was going to build a 496 with around 9.75 to 10:1 compression with a HYD roller cam around 230 with a set of 820 heads off of a 71 vette, longtube headers and depending on what I need either a 750 or 850 carb. I was wondering how this setup sounds and what kind of power I can look for based off of some of the experiences you have had
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1971 Custom 10 LWB. 461 BBC and built 700r4 to be transplanted 1997 C3500 DRW Ext cab. 454, 4L80E daily driver |
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02-28-2011, 09:40 PM
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#2 |
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Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,892
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Re: My daily driven BBC
I'm not familiar with that head but a 10-1 496 would be sweet!
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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03-01-2011, 12:04 AM
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#3 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: My daily driven BBC
Back when I built the 454 in my Burb, I used a set of the '71 402 820 casting heads. At the time (about 20 years ago) I read that those were the heads to use. They were supposed to flow the best for an oval port head.
Since this engine has over 120,000 on it, I've considered rebuilding it, but this time with a 4.250 crank. I'll be subscribing to see what others have to say about this combo.
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03-01-2011, 09:38 AM
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#4 |
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Registered User
Join Date: Dec 2009
Location: Voorhees NJ
Posts: 188
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Re: My daily driven BBC
I was told the same thing about the 820 heads. I know the 049 and 781 are a little better but these beads were free so I can't beat that. I am going to have bigger valves and a little port and polish done to clean them up. After all these trucks are heavy so im more concerned with having a high torque number rather than a high hp
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1971 Custom 10 LWB. 461 BBC and built 700r4 to be transplanted 1997 C3500 DRW Ext cab. 454, 4L80E daily driver |
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03-01-2011, 08:43 PM
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#5 |
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Junior Member
Join Date: Sep 2005
Location: Minnesota
Posts: 159
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Re: My daily driven BBC
I had a 496 in a malibu with ported 820 heads 10.75 comp and a solid flat tappet cam that made 612 hp.
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1970 blazer, street/strip project 1963 ford fairlane sports coupe 50,000 original miles |
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03-01-2011, 09:01 PM
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#6 |
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Registered User
Join Date: Dec 2009
Location: Voorhees NJ
Posts: 188
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Re: My daily driven BBC
How much port work was done on those heads
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1971 Custom 10 LWB. 461 BBC and built 700r4 to be transplanted 1997 C3500 DRW Ext cab. 454, 4L80E daily driver |
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03-02-2011, 10:06 PM
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#7 |
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Junior Member
Join Date: Sep 2005
Location: Minnesota
Posts: 159
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Re: My daily driven BBC
I am not sure how much work was done, I got them after they were ported. I cant remember what they flowed either I think they flowed right around 300 at .600 lift and they had bigger valves.
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1970 blazer, street/strip project 1963 ford fairlane sports coupe 50,000 original miles |
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03-03-2011, 01:50 AM
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#8 |
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Registered User
Join Date: Dec 2009
Location: Voorhees NJ
Posts: 188
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Re: My daily driven BBC
I hope they work I really don't want to buy new heads but I will if I have to
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1971 Custom 10 LWB. 461 BBC and built 700r4 to be transplanted 1997 C3500 DRW Ext cab. 454, 4L80E daily driver |
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