Got a deal on this 800 DP new in the box to go on my 406 . Is this to big for my combo? Iam also building a 383 that I could use my 750 on.
Any one her running a 800on a 406?

It will work, I ran one on a 350 and it was a little too large until I changed out the old 1970 LT1 cam, and put in a Crower grind. Once power was upped to around 425, it handled the carb fine.

That carb had LOTS of jump in the lower gears...
David

I ran one for years on a 402 BB in a bracket car. They tend to meter much better than an 850 and a 400ci motor really doesn't any bigger.

[ 09-03-2003, 12:41 PM: Message edited by: oger ]

I'm running an 850DP on my 377. I know it should be to big, but the car picked up .25 seconds (1/4 mile)over the 750DP that I was running. I've also tried a 650 and a 700, but the 850 has performed the best. I'm just saying the only way you will know for sure is to try it and see how it works.

David

I wonder if this is related at all to the recent David Vizard statement on using a 'larger' carb on a good dual-plane intake manifold. I've always respected his experience and was surprised to read that.

The more of a full divider between the intake halves, the smaller the carb appears to the engine.
The effective "size" of the carb could be "adjusted" by using either an open or closed spacer. the open spacer would make the carb act larger since all 8 cyls would share a pull on all four barrels.

I had my 800 on the old Tarantula 1 manifold with 4.56 gears. If it were on a dual plane manifold it would have been better with the stock LT1 cam I ran at first.
David

Installed the 800 Holley DP and I love it seems to have more power all the way to 6400 my shiftpoint No bog and also seems to idle better.
Taking car to track Saturday to see how she runs. 850 miles on motor could use some pointers how to start off with street tires , sounds like a new topic Thanks guys.

So you are replacing the 750 BG with the 800 Holley?

Mutant68 I replaced it today The 750 I have I bought use and it seem to have a flat spot in the mid RPM range and this 800 is new .also pulls strong off idle to 6400.

To calculate the CFM of the motor use this formula:

RPM(peak) * CID / 3456 * VE

VE is the volumetric efficiency and will range from 80 to 90% usually but can approach 100% at high RPM depending on the combination.

Using your engine size at 6000RPM You'll see about 700cfm at 100% VE. At 7000RPM you'll see about 822cfm at 100% VE.

But big blocks aren't quite as finicky with over-sized carbs as a small block 350 is. Especially with longer stroke motors, so 800 probably will work fine. If you have any off-idle hesitation problems, you should be able to tune them out.

-dnult