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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 |
Registered User
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 |
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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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Anthony |
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#17 |
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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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#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
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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#19 |
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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#20 |
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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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Anthony |
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#21 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
lol....I guess the 650 dp is not a good idea
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#22 | |
Senior Member
![]() Join Date: Jul 2000
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.
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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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#23 | |
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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.
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Anthony |
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#24 |
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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#25 |
Registered User
Join Date: Sep 2015
Location: Toronto
Posts: 24
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Re: holley 650 dp on 383
Im not concerned about gas mileage, its not a daily driver.
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