View Full Version : What is the best size HOLLEY for 351 windsor


tml
01/09/06, 07:21 AM
Lokking to put a Holley on my 351 w. What's the best size. Mild cam, 3 speed. Bored 30 over. Performer intake?? Any input.

wildbill
01/09/06, 08:42 AM
;D ;D ;D Unless you are going for top end I would say dont go over about 600 CFM And you should be happy with the way it will run. I run a 351W with a carter 625 and it works very good. I run a RV typ cam hooker headers, unlite and stock bore good luck with your,s. :D :D :D Bill 8-) %) :p

broncnaz
01/09/06, 10:05 AM
I agree 600 cfm is plenty unless your running high RPM's. I ran a 600cfm holley on a 460 thing ran great but it was only used for towing and would rarely see more than 3000 rpm.

TJK74
01/09/06, 10:38 AM
Your shouldn't need more than 600-650. I have a 650 on my built 351 with a pretty good size cam and its more than enough.

RajinCajun
01/09/06, 10:44 AM
I will the 600cfm range, the only one I would reccomend is the Holley 670, that is a little over, but I am running a 770 on my 69' Stang with a 351, and it runs great....

BroncoMark
01/09/06, 10:50 AM
Glad i didn't chime in. I woulda said 750 ;D

RajinCajun
01/09/06, 10:59 AM
If you were running on the street, you are right a 750 would be great on a 351, but it will cause problems when slow going.. to much fuel and not enough air flow until RPM's come up...

joser
01/09/06, 11:23 AM
I've got a Holley 670 Truck Avenger. It is a little more carb than I really need, but jetted right it runs great. I have run into all kinds of up, down, and sideways angles off road and this carb just keeps running great.

I used to have, still have on the shelf, a Holley 650 double pumper. It ran awesome on the street, but had problems running at off-road angles.

Good luck.

KJHill
01/09/06, 11:51 AM
I've got the 670 TA also. Seems to do OK.

Broncobowsher
01/09/06, 12:03 PM
Friend had a 750 double pumper on stock camed but freshened top end '70 351. Ran great. but that engine liked to breath.

I built a similer engine with RV cam and come ion for my Bronco. 600 worked very well Currently running 700 CFM throttle body EFI

When I was in school someone had an econoline that had a 351 bone stock. 390 CFM but it was bone stock and gutless over 4000 but not sure if it was the little carb but generally thought it was just how a stock motor ran.

With what you list, 600 vacuum secondary should be a good balance drivable, powerful and economical.

BUCKETOBOLTS
01/09/06, 12:16 PM
I just built a 393W this past summer for my rig. I run 9.5:1 compression with a .450 lift 210-220 duration cam. The heads are rebuilt D00E's with a dual plane manifold and Hedman Hedders. I run my trusty old blueprinted #4776 600cfm double pump. She is nice and crisp, has excellent throttle response from any rpm, and pulls hard up to 5500rpm. I believe if I went much bigger it would kill the bottom end were I like the punch.

bronco-billy-66
01/09/06, 05:40 PM
I'm running a 625 road demon on my 351...mild cam,dual plane int. headers with 4.11's and 35's. Runs great I have never liked a vacume sec. But this one changed my mind

76Broncofromhell
01/09/06, 06:57 PM
750 CFM is Waaaaaaay too big for a mild 351W. The only way I can see a 750 being appropriate is if your intake ports are flowing at least 260CFM @.550 lift. If you aren't running a cam over 550 lift and 300 degrees duration you are just wasting your money and fuel.

A 650 is almost too big for a mild 351 (stockish heads with a ~.520 lift / 285 duration cam). I run a 650 DP on my flat fender and it is more than enough to rip the pavement out from under the thing. I run the 750 DP on the 408 in the Bronco.

slyjki
01/09/06, 07:45 PM
i had a 650 holley on mine a soon changed to a edelb. 600 it worked much better. i think holley is a good street carb but not so great off road even with the offroad kit installed

jarrod
01/09/06, 07:59 PM
I also have the 670 truck advenger on mine and I really like it.

tml
01/10/06, 06:09 AM
I've got a Q-jet on there now, I'm considering changing to a holley because of clearence problems under the hood. I've got an old holley here, not sure what size it is, I'm thinking of getting it rebuilt. She runs good now, will it run better with the holley??

TJK74
01/10/06, 06:55 AM
I've got a Q-jet on there now, I'm considering changing to a holley because of clearence problems under the hood. I've got an old holley here, not sure what size it is, I'm thinking of getting it rebuilt. She runs good now, will it run better with the holley??

Well What do you use your rig for? If you do alot of wheeling and angles a standard rebuild is not what you want. I tried 3 q-jets and they werent working for me so i stuck with my Holley. After basically turning it into a Truck advenger and adding a fuel regulator it now works flawless on angles, whoops bumps you name it. I think there is a tread out there that goes into detail on the mods and how to do them. The one thing I like about holleys is they have a wide range of adjustability. Which can also be a bad thing if your not too savvy on messing with carbs.

daddyg
01/10/06, 08:27 AM
I wish Holley would come out with a 570 TA. I run the 470 on my 302 but it would probably be a little small for a 351.