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#1 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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holley 650 dp on 383
I can get a holley 650 dp, will this be a good choice on 383 1986 silverado.here are engine specs http://www.jasperengines.com/pdf/Cla...20Stroker%2009
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: holley 650 dp on 383
Might work if....
You have the right high stall convertor and rear gears. Like 2800 stall and 3.73's. But... I prefer a vac sec carb like the holley 3310 750 cfm. Easier tuned with adjustable secondaries. |
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#3 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
Thats what I have now, 3310...Im not sure of gearing . I just got truck 4 weeks ago.
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#4 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
I think 4.10
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#5 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
th 400 trans. from jasper too
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#6 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
geezer, I also have elec. fuel pump regulated to 8 * , then get back from drive and its at 4.5-5*. Is this norm or is pump f****
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#7 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: holley 650 dp on 383
As long as you don't run out of gas at 6 grand, you're good.
Is it a liquid filled gauge? They're known to do that. |
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#8 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
holley guage , not liquid filled , holley regulater too. I noticed it did this when I switched from eddy to holley carb. ??? not before.
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#9 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,777
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Re: holley 650 dp on 383
650cfm will be a better street carb. it will speed up the velocity of the air down low in the rpm range. i agree on a vacuum secondary, especially for an auto trans.
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#10 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
ya, the 650 I can get is mech. secondaries. Ill keep the 3310. at least for now.
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#11 |
Registered User
Join Date: Aug 2015
Location: Omaha
Posts: 10
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Re: holley 650 dp on 383
The 650 DP will be fine. Jet it a couple sizes below factory spec, and run it.
I had one on my 10.5:1 383 and it loved it. |
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#12 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
thanks cad, do you remember jet # size ?
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#13 |
Registered User
Join Date: Aug 2015
Location: Omaha
Posts: 10
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Re: holley 650 dp on 383
Here is a good listing of orig specs for all Holleys.
http://www.allcarbs.com/tech.php?art=21 The model # will be on the choke horn (4777-1, etc). These are the baseline jets listed. |
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#14 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
thats great ... no trouble with being automatic trans., like Im reading in forums and like Outlaw Drifter pointed
out ? |
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#15 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: holley 650 dp on 383
Regardless if it'll work or not, its not an upgrade from your current 3310. You'll get zero improvment in power, torque or gas mileage.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#16 | |
Senior Member
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Location: North Texas
Posts: 3,488
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Re: holley 650 dp on 383
Quote:
Of course, that assumes proper jetting and power valve selection, as well as staying out of the secondaries until the engine needs them. That said, I wouldn't use a DP any bigger than 390-450 on a heavy vehicle with auto trans. Interesting note: Holley says if you can feel the secondaries kick in, what you're really feeling is a bog.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#17 | |
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Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: holley 650 dp on 383
Quote:
BTW, THe Smallest DP I know of is a 390cfm and next one up is a 600cfm. This type of carb doesnt fit this build at all.
__________________
Anthony |
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#18 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: holley 650 dp on 383
Your not factoring in the massive amount of fuel shot in[doublepump= double shot of gas] every time the accelerator is advanced at all.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#19 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: holley 650 dp on 383
Quote:
BTW, back around 2002 I ran a 650 VC Holley modified by QFT on a mild 383 with a Crane cam (210/210; .470"/.470" lift with 1.6 rockers), Dart 180 heads, and Performer RPM intake. It worked well and let the engine rev to 5800 RPM or so, which was 600 RPM higher than with a Performer 2101 and Edelbrock 600 carb. However, I probably didn't rev it that high more than twice! To me the beauty of a 383 is low- and mid-range torque. So you don't have to rev it as much as a 350 to go fast.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#20 | |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: holley 650 dp on 383
Quote:
A 600 cfm carb will starve a 383 if it`s anything more than stock and you are trying to rev it, and 5800rpms isnt high. It all depends on how the engine is built as to what rpm it will need to turn. The same cam in a 350 and a 383 will have 2 different power bands. The bigger engine will be done sooner.
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#21 |
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Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: holley 650 dp on 383
That camshaft is fairly mild in a 383. I would say the 650 would not be the best choice in a street application. Im a die hard Holley guy but for this set up I`d actually recommend a q-jet from Sean Murphy Inductions. I think in this application it would out perform the 650 as well as the 3310.
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#22 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,777
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Re: holley 650 dp on 383
A qjet is the best choice period. People are scared of them because they are complicated.
__________________
1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#23 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: holley 650 dp on 383
That's been dyno proven to be un-true, at least for best power.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#24 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,777
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Re: holley 650 dp on 383
I didn't say it was the best for peak HP numbers. It's a better street carb, plain and simple. I'll give up a few ponies on the top side for better driving manners and set it and forget it maintenance.
__________________
1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#25 |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: holley 650 dp on 383
For this mild engine the qjet is perfect. It`s going to be a grunt engine. Dont think it will even see 400hp but should be over 400ftlbs of torque. Besides, unless this is going to hit a dyno I dont think the OP will notice a difference but he should like the throttle response and economy the qjet offers as well as great performance. As I said before, I`m a die hard Holley guy but I`ve seen these custom qjets make the same or more hp over the Holleys in certain situations.
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