After exhausting every avenue locally , today I ordered one on eBay .
I have one already , but everybody says that a 750CFM 4160 is just too
much carb for a 305 small block GM motor even with the mods I've made .
The one I ordered is a 600 CFM 4160 , and it has some differences . The biggest one is the fuel bowls on the 750 have center pivot floats and
dual inlets vs the 600 has side pivot floats and a tube to feed the rear
bowl . Both have metering plates on the secondaries and in all other
respects as far as I can tell are identical . Is there anything
inherently better about either center vs side pivot floats ? I have a
full rebuild kit that fits both , so it will be torn down as far as they recommend .
The stock quadrajet has problems , and I'm tired of trying to tune it
. Everybody always told me Holleys are a lot easier , and I've always
wanted to try one so here we go !
On 6/4/2022 3:43 PM, Snag wrote:
After exhausting every avenue locally , today I ordered one on eBay .
I have one already , but everybody says that a 750CFM 4160 is just too
much carb for a 305 small block GM motor even with the mods I've made .
The one I ordered is a 600 CFM 4160 , and it has some differences . The
biggest one is the fuel bowls on the 750 have center pivot floats and
dual inlets vs the 600 has side pivot floats and a tube to feed the rear
bowl . Both have metering plates on the secondaries and in all other
respects as far as I can tell are identical . Is there anything
inherently better about either center vs side pivot floats ? I have a
full rebuild kit that fits both , so it will be torn down as far as they
recommend .
The stock quadrajet has problems , and I'm tired of trying to tune it
. Everybody always told me Holleys are a lot easier , and I've always
wanted to try one so here we go !
Don't have much to add directly, but we ran a Holley 650 with vacuum >secondaries on a 351W in a full size 2 door Bronco. (a little biggerUnless you have a huge cam in that 305 a 500cfm carb would be
engine) and it was plenty.
On Sat, 4 Jun 2022 18:09:34 -0700, Bob La Londe <none@none.com99>
wrote:
On 6/4/2022 3:43 PM, Snag wrote:Unless you have a huge cam in that 305 a 500cfm carb would be
After exhausting every avenue locally , today I ordered one on eBay . >>> I have one already , but everybody says that a 750CFM 4160 is just too
much carb for a 305 small block GM motor even with the mods I've made .
The one I ordered is a 600 CFM 4160 , and it has some differences . The
biggest one is the fuel bowls on the 750 have center pivot floats and
dual inlets vs the 600 has side pivot floats and a tube to feed the rear >>> bowl . Both have metering plates on the secondaries and in all other
respects as far as I can tell are identical . Is there anything
inherently better about either center vs side pivot floats ? I have a
full rebuild kit that fits both , so it will be torn down as far as they >>> recommend .
The stock quadrajet has problems , and I'm tired of trying to tune it >>> . Everybody always told me Holleys are a lot easier , and I've always
wanted to try one so here we go !
Don't have much to add directly, but we ran a Holley 650 with vacuum
secondaries on a 351W in a full size 2 door Bronco. (a little bigger
engine) and it was plenty.
adequate, and the 600 will be as big as you want to go. As for the
floats? if you are going off-road or severe off-camber driving the center-hung carb will make you a LOT happier. Can you put the center
hung bowls on the 600???
On 6/5/2022 8:16 PM, Clare Snyder wrote:Put a good heat insulator between the carb and manifold to help
On Sat, 4 Jun 2022 18:09:34 -0700, Bob La Londe <none@none.com99>
wrote:
On 6/4/2022 3:43 PM, Snag wrote:Unless you have a huge cam in that 305 a 500cfm carb would be
After exhausting every avenue locally , today I ordered one on eBay . >>>> I have one already , but everybody says that a 750CFM 4160 is just too >>>> much carb for a 305 small block GM motor even with the mods I've made . >>>> The one I ordered is a 600 CFM 4160 , and it has some differences . The >>>> biggest one is the fuel bowls on the 750 have center pivot floats and
dual inlets vs the 600 has side pivot floats and a tube to feed the rear >>>> bowl . Both have metering plates on the secondaries and in all other
respects as far as I can tell are identical . Is there anything
inherently better about either center vs side pivot floats ? I have a >>>> full rebuild kit that fits both , so it will be torn down as far as they >>>> recommend .
The stock quadrajet has problems , and I'm tired of trying to tune it >>>> . Everybody always told me Holleys are a lot easier , and I've always
wanted to try one so here we go !
Don't have much to add directly, but we ran a Holley 650 with vacuum
secondaries on a 351W in a full size 2 door Bronco. (a little bigger
engine) and it was plenty.
adequate, and the 600 will be as big as you want to go. As for the
floats? if you are going off-road or severe off-camber driving the
center-hung carb will make you a LOT happier. Can you put the center
hung bowls on the 600???
I was wondering about switching the bowls ... which would also mean
switching to the dual fuel inlet setup . I'll see what will fit when the >"new" carb arrives . As far as the cam , the mfr classes it as a "stage
3 RV cam" (Elgin E-922-P) , whatever that means . I think it's pretty
close to what we used to call a "3/4 race cam" . Specs are .444 lift
intake and .466 exhaust , with 214 and 224 duration @ .050 lift (288
and 298) . Lobe separation is 112 . I don't think it's all that
radical ... I expected a reasonably decent idle around 800-900 , but I
can't get the quad to run right below about 1500 or so (haven't hooked
up the new tach yet) . Idle speed screw is almost all the way in and the
idle mix needles are making no difference at all . I just totally
rebuilt that carb , everything is spot on the specs and I sealed the
metering needle wells with JB weld . This carb has had a history of long >cranking to start if it's been sitting more than a few hours , like the
bowl is emptying while it sits . I'm just tired of trying to figure this
one out , I usually have no problems with getting a quad to run well .
On Sun, 5 Jun 2022 22:30:58 -0500, Snag <Snag_one@msn.com> wrote:
On 6/5/2022 8:16 PM, Clare Snyder wrote:Put a good heat insulator between the carb and manifold to help
On Sat, 4 Jun 2022 18:09:34 -0700, Bob La Londe <none@none.com99>
wrote:
On 6/4/2022 3:43 PM, Snag wrote:Unless you have a huge cam in that 305 a 500cfm carb would be
After exhausting every avenue locally , today I ordered one on eBay .
I have one already , but everybody says that a 750CFM 4160 is just too >>>>> much carb for a 305 small block GM motor even with the mods I've made . >>>>> The one I ordered is a 600 CFM 4160 , and it has some differences . The >>>>> biggest one is the fuel bowls on the 750 have center pivot floats and >>>>> dual inlets vs the 600 has side pivot floats and a tube to feed the rear >>>>> bowl . Both have metering plates on the secondaries and in all other >>>>> respects as far as I can tell are identical . Is there anything
inherently better about either center vs side pivot floats ? I have a >>>>> full rebuild kit that fits both , so it will be torn down as far as they >>>>> recommend .
The stock quadrajet has problems , and I'm tired of trying to tune it
. Everybody always told me Holleys are a lot easier , and I've always >>>>> wanted to try one so here we go !
Don't have much to add directly, but we ran a Holley 650 with vacuum
secondaries on a 351W in a full size 2 door Bronco. (a little bigger
engine) and it was plenty.
adequate, and the 600 will be as big as you want to go. As for the
floats? if you are going off-road or severe off-camber driving the
center-hung carb will make you a LOT happier. Can you put the center
hung bowls on the 600???
I was wondering about switching the bowls ... which would also mean
switching to the dual fuel inlet setup . I'll see what will fit when the
"new" carb arrives . As far as the cam , the mfr classes it as a "stage
3 RV cam" (Elgin E-922-P) , whatever that means . I think it's pretty
close to what we used to call a "3/4 race cam" . Specs are .444 lift
intake and .466 exhaust , with 214° and 224° duration @ .050 lift (288° >> and 298°) . Lobe separation is 112° . I don't think it's all that
radical ... I expected a reasonably decent idle around 800-900 , but I
can't get the quad to run right below about 1500 or so (haven't hooked
up the new tach yet) . Idle speed screw is almost all the way in and the
idle mix needles are making no difference at all . I just totally
rebuilt that carb , everything is spot on the specs and I sealed the
metering needle wells with JB weld . This carb has had a history of long
cranking to start if it's been sitting more than a few hours , like the
bowl is emptying while it sits . I'm just tired of trying to figure this
one out , I usually have no problems with getting a quad to run well .
prevent the bowls boiling dry on a hot shut-down (makng the engine
over rich after a short shutdown - and slow to start after a long
soak.
The "stage 3 RV cam" WILL be lumpy below 1200RPM but unlike the "3/4
race" will be biased twards low end "grunt", not high RPM
performance. Good from 2000 to 4600 RPM. The 922 runs from 2200 to
5400 RPM - more of the "3/4 race" grind. - close to the factory z28
cam of the late sixties. The 921 is basically the L82 cam. Whar CR are
you running? Hopefully better than 9:1
On 6/4/2022 3:43 PM, Snag wrote:
After exhausting every avenue locally , today I ordered one on eBay
. I have one already , but everybody says that a 750CFM 4160 is just
too much carb for a 305 small block GM motor even with the mods I've
made . The one I ordered is a 600 CFM 4160 , and it has some
differences . The biggest one is the fuel bowls on the 750 have center
pivot floats and dual inlets vs the 600 has side pivot floats and a
tube to feed the rear bowl . Both have metering plates on the
secondaries and in all other respects as far as I can tell are
identical . Is there anything inherently better about either center
vs side pivot floats ? I have a full rebuild kit that fits both , so
it will be torn down as far as they recommend .
The stock quadrajet has problems , and I'm tired of trying to tune
it . Everybody always told me Holleys are a lot easier , and I've
always wanted to try one so here we go !
Don't have much to add directly, but we ran a Holley 650 with vacuum secondaries on a 351W in a full size 2 door Bronco. (a little bigger engine) and it was plenty.
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