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Author
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Topic: Holley 650HP tuning
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-14-2004 10:58 PM
 
I bought a nice 650 HP racing carb from a swapmeet and I've been tuning it on the 331 for a hot 302 project. Came with stock configuration. 70/70 jets, 65 PV front and rear, and 27/28 squirters. Needless to say, it didn't run perfect out of the box. I was a little disappointed. I had to move up to different pump cams (green or blue I think) and 35 squirters front and rear to get rid of a major lean spot under a hard pull. The idle would not come down below 1200 without closing the butterflies completely, so I had to remove the pretty stainless drilled butterflies and install some plain ones. It's running pretty good now but there may be a few more ponies hiding somewhere.  Do you think the 35 nozzles are too big for a 650?? I only had to use 31's in my 750HP, but it has different metering blocks and down leg boosters. Any ideas on what to try next. I want to get it ready for a dyno run. Thanks. ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 09-15-2004 12:59 AM
I think I've been banded from giving carb advice for now. But I'd run the 35's ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-15-2004 08:07 AM
Heck man, I'm always open to ideas! I don't care who or where they come from. It keeps that air between my ears fresh. Plus without helpful advice, I'm always running in circles!  ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-15-2004 09:16 AM
dan, i sure you know that the squrters have nothing to do with the flow after the initial pump shot. i had to go up to 42's before i got the stumble out of my 310. usually if you got a stumble, it is a lack of fuel or the fuel coming in late. the squrters should have nothing to do with your dyno pull.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-15-2004 09:17 AM
quote:
Originally posted by Fastymz:
I think I've been banded from giving carb advice for now.
LOL at ron!! that was funny!
------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-15-2004 12:39 PM
What about the rear PV. Should I plug it and go up jet size?------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-15-2004 01:14 PM
the pv's are there for slow and street driveability. they add 6-8 numbers to your jets when the vacuum drops below their rating. (6.5,3.5 etc) in theory they are completly open at WOT! i run mine plugged just for consistancys sake. there sould not be a power difference either way.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-15-2004 01:15 PM
hey SCOOP are you impressed yet!! ------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 09-15-2004 02:44 PM
quote:
Originally posted by capri man:
hey SCOOP are you impressed yet!!
YES ! Dan, my 700dp ddn't come with a rear PV. If it did I'd plug and up the jets too. ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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n2oMike
Gearhead Posts: 3058
From: Spencer, WV
Registered: Jan 2001
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posted 09-15-2004 03:38 PM
I'm sure someone will correct me if I'm wrong, but I would say a rear power valve can become uncovered on a dragstrip start. Therefore, you should...Plug the rear power valve, up the secondary jets 6-8 sizes to compensate, and add jet extensions. Holley sells a kit that includes screw-in jet extensions and a notched float for around $17. (I'm not stupid with a carb, but I'm by no means a carb specialist... but that's what I would do) Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-15-2004 08:24 PM
yes definatly get some jet extentions for the rear. actually i have never seen one come with a PV in the rear.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-15-2004 09:14 PM
Yep, the 650 "HP" (high performance??) is a different animal than most 650's. It comes from Holley with all the xtr goodies. I think it's more of a road race carb than a strip carb though.Here's the description:
http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSC/0-80541-1.html ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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