Intake and carb.

[Big-Tex]

Currently i have a 454 bbc, 030 over, trw L2377 pistons, isky cam .565 lift, 232 dur @.050, harland sharp roller rockers, large valves. On top is a holley 650 DP, edlebrock tm2-0 intake. Intake is 2000-6000 rpm range and built it 1977. I have a fresh rebuilt 12jb berkeley with b imp. 9 begree wedge, ride plate. All this is in a 1976 sleekcraft 18ft. It ran out at 4800 rpms and 65.9 mph on gps. would like input on a good intake and was thinking about an 850dp. Any advice would be helpful. Thanks

[BIGS]

Hello BIG TEX..........A 850 carb would be a great choice for your application........Cant think of a better carb for the money......Take a look at the 850 that we build ......Thanx alot, Jesse @ BIGS eek!
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1845894728

[squirt]

And can't think of a nicer place to put your shinney new Biggs 850 dp ( in your choice of colors) than on top of a beautiful Victor JR. manifold. Can be had new for $203.00 from Summit Racing. Don :D

[HammerDown]

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[ July 31, 2002, 04:39 AM: Message edited by: HammerDown ]

[HammerDown]

For a 454 or even a 468 spinning under 5000 rpm...I would belive an 850 would be to large of a carb. I'm using a 715 Vac secondary on a 468 at 5200 rpm and the motor runs fine...Bolted on a friends 850 DP, tweeked it in and it did nothing, No more rpm's and a little dogie in the midrange area. I'm back to the 715...I agree that a 750 cfm would be a great all around carb for motors in that rpm area. Just my 2 cents!

[Hotcrusader76]

HammerDown:
For a 454 or even a 468 spinning under 5000 rpm...I would belive an 850 would be to large of a carb. I'm using a 715 Vac secondary on a 468 at 5200 rpm and the motor runs fine...Bolted on a friends 850 DP, tweeked it in and it did nothing, No more rpm's and a little dogie in the midrange area. I'm back to the 715...I agree that a 750 cfm would be a great all around carb for motors in that rpm area. Just my 2 cents!And your right on that! A 750DP is all you need for that RPM potential. An 850 would limit your throttle response for cruising around the slow areas on the water.
"Bigger is not always better" Remember that. A motor only needs 1.2cfm per Horsepower to perform. An advertised 850cfm...Big deal! You motor will still only pull 600 actual cfm at 6hg vacuum and 500HP average, with a 9-9.5 compression around 6K. 850cfm???? Not enough vacuum signal for a "boats" intended use. Stick with the 750DP with a leaner emulsion circuit.
-Ty
[ July 31, 2002, 06:26 AM: Message edited by: Hotcrusader76 ]

[squirt]

Ya know Hammer I'm running a 715 also. I've just not heard anyone complain about an 850 before and was even considering giving on a trial. I really like my carb but I was thinking if I bump the cam and heads then I might need more carb. Don

[HammerDown]

Don I'm using the 715 on a 468 Chev with 10:1 Comp. A Comp Cam 550 lift 232/237 duration, 110 lob sep. Over transom Headers, Stealth Intake. And the the heads are 049's Oval port open chamber. With all kinds of work done to them. As I stated befor...I tried an 850 DP, and it did nothing for (me). If any thing maybe a 750 would be ideal but I cant see spending the money unless I would be spining much higher rpm's.
A friend of mine from some years ago had a 468 12:1 motor that saw rpm's in the high 6000 area....with the same 715 carb! And that's a fact!