C’mon guys, this is a mild 318. With a 7-1/4 rear end and 2.76 gears I’ve already blown up twice. A double pumper isn’t what I need or want. Just want opinions on the four I listed.
I had discovered Holley’s refurb carb offerings a couple weeks ago and would like to save some cash, but the only 600 cfm carb in stock is a Street Warrior. But I don’t know how it compares to the other three I asked about.
The shafts on my current 1850 have a lot of slop. If carb cleaner is spayed near them the rpm’s go way up. It also never goes back to within 150 rpm of the original idle speed when the throttle is blipped. Transfer slots are square, mixture screws are 1.5 turns out and the floats are set correctly. I’ve been fighting with this thing long enough. I think a new carb is in order.
I would just like an opinion on the 4 carbs I asked about.
Thanks.
On my 360 I have an ancient Holley 750DP. It was old already in the mid 70s when I got it used. Yes the throttle shafts are pretty sloppy loose, so what; I'm not trying to idle it down to 500 rpm.
My guess , from your description, is that you got too much idle-timing, and your Mixture screws are not synced properly to your transfer slots, so then, once the airspeed gets up after a blip, the mixture screws won't quit flowing. Yes I heard you say your transfers were set square, but square is just a starting point.
So then, my advice is;
With a warmed up engine, a fully functioning PCV system, NO air leaks, and a disable VA; make sure the secondaries are fully closed but not sticking, then
Reset the timing to eight degrees, and
and reset the mixture screws to 5/8 turn out. then
increase the idle rpm to 650 in gear. Then
enable the VA, on the spark-port, and make sure the VA is NOT active at idle.
Finally, fix your power timing. You will have to modify your distributor, and until you do, the bottom-end will be lazy, and Power may be down, depending on it's current calibration.
BTW;
I also have an 1850/600VS that is just as ancient as my 750 DP.... which runs just fine. In fact, that 600 is my long-distance cruiser carb, specially prepped for fuel economy. I won't tell that it once got 32 mpg, in overdrive, on a certain 8 hour day trip, cuz some guys on here love to preach to me how that is impossible and then they call me a liar.. So if you heard that, it must be an echo.
Zillah is said to be at 850ft elevation. I'm at 900 to 950. So there's no problem there.
And as an aside,
your combo needs headers to take advantage of any overlap that your cam may have; and those alloy heads, working with headers, will really stretch out the power curve on the top. Yes a small cam may limit the dyno numbers, but so what; are you driving in the dyno room? With 2.76 gears, and a fire breathing combo, you can stretch first gear all the way to 60/65mph.
I wouldn't spend a Nickle on a different carb until after the headers are on.
And as far as your combo goes,
Your combo would run gangbusters with a higher than stock stall with those sick 2.76 gears. My winter 318 used to run a 2800, which I grew very fond of; and of course, I love DP carbs, spreadbores for 318s, and on a matching intake.
