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Author
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Topic: Holley carb ?
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Fastymz
Gearhead Posts: 168
From: Reno Nv
Registered: Apr 2001
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posted 09-20-2001 12:29 AM
   
Which Holley carb should I go with.I'm looking at the 750 vac,sec, model 4160.Is one ok for my app,or is there a better choice.Thanks for the help.The carter has been giving me fits that I cant seen to work out.So its holley time.Ron------------------
65 coupe with a stock 1969 351w,RPM intake,carter625cfm,shorty hedmen hedders,black magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,cragers,primer black.
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65_302
Journeyman Posts: 26
From: Bixby, OK
Registered: Jul 2001
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posted 09-20-2001 01:09 PM
We are putting a Holley 650 dp on my son's 302 xb3 motor tomorrow. Will let you know if it is/is not a hugh imporvement over the 600 Edlebrock.
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Fastymz
Gearhead Posts: 168
From: Reno Nv
Registered: Apr 2001
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posted 09-20-2001 01:18 PM
That would be great thanks Ron.Looking foward to hearing from you.------------------
65 coupe with a stock 1969 351w,RPM intake,carter625cfm,shorty hedmen hedders,black magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,cragers,primer black.
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chips67
Gearhead Posts: 255
From: louisville, ky, usa
Registered: Jul 2001
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posted 09-20-2001 08:49 PM
that would be a step up, how about a 750?------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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Fastymz
Gearhead Posts: 168
From: Reno Nv
Registered: Apr 2001
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posted 09-20-2001 09:09 PM
CHIP DO YOU THINK THE 750 DP WOULD BE TO MUCH LET ME.------------------
65 coupe with a stock 1969 351w,RPM intake,carter625cfm,shorty hedmen hedders,black magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,cragers,primer black.
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chips67
Gearhead Posts: 255
From: louisville, ky, usa
Registered: Jul 2001
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posted 09-20-2001 09:44 PM
a 650 will work fine, but i think a 750 holley would be the best choice for a 351w to give you the best performance and a broad range of power potential. i think a 650 is better suited for a 289-302 application.------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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bluestreek
Gearhead Posts: 254
From: Athens,GA
Registered: Jul 2001
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posted 09-21-2001 09:35 AM
A 750 DP will not be a good choice on a stock 351W.. A friend of mine is running a stock 355ci auto with 3.73 gears... With a 750 DP he was getting 14.10 - 13.90s @ 94 mph with a 1.90 60'.. I noticed that his 3400lb car was stumbling bad off the line.. Nothing we did would help, so I helped him build a 600 Vac sec. out of spare parts I had laying around the shop and we installed it with a 1 in. 4hole spacer and next time out, his times dropped to 13.60s @ 95 mph with a 1.80 60' with no other changes.. We also tried a 750 Vac sec on it and ran almost identical times as the 600 vac sec but it wasn't consistent.. He drives his car a lot and loves the 600 Vac sec.. The last time we were at Commerce, he ran 5 consecutive 13.64s ( he eliminated me  ) and he made it to the money rounds only to be beat at the tree by .010.. So just remember, if you take a chance of oversizing your carb, you may never know the potential of your current engine combination.. If you do choose to go with the 750, I would recommend the vac. sec.... Otherwise any Holley 600 or 650 would be good with some minor tuning ..
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Fastymz
Gearhead Posts: 168
From: Reno Nv
Registered: Apr 2001
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posted 09-21-2001 03:48 PM
Bluestreek So you think the 600 vac sec OR 750 would be best choice even after I do the gears and cam and heads.Just trying to plan ahead.I dont want to over carb by any means.Do you think the 650 dp is to much.
Thanks Chip for the input.dose your 650dp seem to work good and what did you use before the dp.Thanks for the help.Please keep the info coming.------------------
65 coupe with a stock 1969 351w,RPM intake,carter625cfm,shorty hedmen hedders,black magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,cragers,primer black.
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bluestreek
Gearhead Posts: 254
From: Athens,GA
Registered: Jul 2001
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posted 09-21-2001 09:40 PM
Ron,
My previous post was just intended for someone that wants a dependable, moderate performing SB engine that will be used on the street and strip.. I wasn't aware of your plans to build it up.. Sorry .. I do know that a 650 DP will easily get you into the 12s in the 1/4 mile on a 3000 lb car.. Pushing into the 11s will call for a little more..  Planning ahead is a good thing if you want to buy some parts and put them on the shelf until you get the rest of the package together... This plan will work only if you know exactly what to expect from the combination.. Going to a larger carb is something I do out of necessity after I get everything screaming together in harmony, and want to see if there is just a little more HP to gain.. This is the reason I keep a 390 DP, 600 vac, 650 DP, 750 vac, 750 DP, and 850 DP around the shop.. 
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chips67
Gearhead Posts: 255
From: louisville, ky, usa
Registered: Jul 2001
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posted 09-21-2001 10:49 PM
if you plan on building the 351 at all, cam heads, whatever...get the 750. just as a side note, cars that operate at higher altitudes above sea level like bigger carbs. so it depends as much on where you live as well as engine size and modifications.------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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Fastymz
Gearhead Posts: 168
From: Reno Nv
Registered: Apr 2001
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posted 09-23-2001 06:10 PM
Any one else have any info on this.Thanks Ron------------------
65 coupe with a stock 1969 351w,RPM intake,carter625cfm,shorty hedmen hedders,black magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,cragers,primer black.
IP: Logged |
65_302
Journeyman Posts: 26
From: Bixby, OK
Registered: Jul 2001
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posted 09-24-2001 08:02 AM
Well, we put the 650 dp on and it really helps the power situation and the throttle response is super. No hesitation at all. We will dyno and tweak it a little bit this Friday. Only problem is, the cold start. Need suggestions on the best method to start the thing after it sits all night. When its warm, no problem. It would not start at first attempt yesterday morning. After several attempts I got it going by cranking it longer than usual. When we first tried to start it we did not pump the throttle. We just tried it like we did the Edlebrock. Then we gave it a little pump, but it seemed to be a bit flooded. So we let it set for a few minutes then I started it by cranking it a little longer than usual. It has an elec choke which seems to be working ok. One question on that part. Should the choke plate be completely closed on cold start, or
a little open? Runs great after its going, just need any help you can give on the cold start.
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bluestreek
Gearhead Posts: 254
From: Athens,GA
Registered: Jul 2001
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posted 09-24-2001 10:12 AM
65_302,
Here's my 2 cents worth on cold starts with a choke..A choke does 2 things:
1. Richens idle mixture for a cold engine.
2. Increases idle speed.
Most likely, a fully closed choke will flood the engine pretty quickly.. You should pump the accelerator at least once to set the choke and fast idle linkage.. I adjust my choke mechanism to start the engine up at 1500-2000 rpms, with the choke plate partially closed just enough to keep the engine running smoothly.. If the engine fires up and then runs choppy and floods, the choke plate is closed too much.. If the engine fires up and dies, and you have to pump the accelerator again to get it to fire up, then your choke plate is not closed enough.. If you don't get it to start right the first time, try to keep the engine cold so you can adjust it again.. You have to allow the choke to cool back down before readjusting it.. When you get it right, it will start up immediately after one or two pumps of the gas peddle and run smooth at fast idle.. As the choke heats up, and you mash the peddle a few times, it will settle back down to a normal idle setting.. It may take a couple of cold starts to get it all right..
I also like to adjust my idle mixture screws for the most rpms, just after the choke releases and the engine is idling normal.. Dan ------------------
'66 Stang with traction problem!!
289 320hp 4 spd 3.50 trac-loc
http://www.picturelist.net/Images/dbhard/1966.jpg
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65_302
Journeyman Posts: 26
From: Bixby, OK
Registered: Jul 2001
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posted 09-27-2001 08:29 AM
Problem solved. Just needed a little more choke adjustment and a reminder about pumping the accelerator on the Holley. 2 short pumps this morning after the adjustment and it fired up with no problem. The old E we took off did not need to be pumped. It started like EFI. Its still choppy until warm. I will try to increase the fast idle a little to fix that. Now to the dyno tomorrow to see if the Holley fixed our original problem. Thanks for all the help.
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