I dont' know enough yet to say one way or the other but I'll be able to directly compare it to the 4150 model it will be replacing. I'm not sure what makes 4150 DP perform different from a 4165.

That's why I asked what intake you had. A square intake with a spread bore carb and an adapter is a bad idea. The adapter pisses the carb off and it won't be happy.

Back in the 80's I ran the Holley 6711 carb on my warmed 383 with a ~230 degree cam, headers, and holley street dominator intake. Best carb on that combo that I tried. I tried the stock AVS, 440 AVS, Holley 4777 and 4779 double pumpers. The 6711 idled better, crisp off the line, and really woke up that 383 when the secondaries opened, being a double pumper helped a lot.

It's surprising how many guys don't realize that on the primary side the main jet is what you change to alter the fuel curve at a cruse and the power valve open timing and power valve channel restrictions are what you tune for WOT.


I say get a tuneable DP and go have fun. [/quote]


Actually that's just what I did. I leaned my primary jets a little and opened up the power valve channels and it helped clean up my cruise. But at light throttle cruise you can still be running on the idle and transfer slot circuits. I wanted to clean mine up at even higher speed cruise up to just before my secondaries start to open and it worked very well leaning the primary jets a bit and drilling the power valve channels out some to keep enough fuel at WOT on my 850 DP. Ron

I didn't read all the posts but my opinion is if your great at tuning or if your gonna have a knowledgeable person set up your carb pick simply pick one and enjoy. I've had AFB Edelbrock's in dual quad fashion- single carb vacuum secondary Holley and mechanical secondary Holleys all on 440s. All were razor tuned and excellent for STREET driving. I give them both equal outstanding marks.

3310. If you were not planning on upgrading your engine further, I would say 1850.

Initially the motor has a LD4B with the 6711 and an adapter. It will be getting an Air Gap this summer. Got the 6711 torn down last week and found a crack in the base plate at a front mounting boss. Going to have to see if I can weld that up before I commit to the rebuild.