Holley carb rebuild

[1978 Rogers]

I have a holley 4777 (650) w/ 67 (F) 76 (R)on a mild 460 w/ a turning 4800 wot. I was wondering if it would be a waste of time/money to buy a new 750 main body retro fit kit and add my metering blocks and bowls, etc to it. I saw 2 in the Jegs catalog one from Holley for $125 and another from ? for $100. It seems to be cost affective way to step up to a bigger carb. I imagine I'd need different jets. I had the choke removed and air horn ground down when I had it rebuilt a 4 years ago.
After a couple thorough cleaning twice during this season to get rid of corrosion from water in my fuel, it seems pretty easy or work on these. I just wanted some others advice on the main body kits available. Seems a lot cheeper of a way to get a bigger carb on the boat. If you have the lates Jegs catalog, there on page 78 & 80.

[YeLLowBoaT]

I think you would actually get less airflow by doing that. The 4779(750) has larger ventruis then the 650. the base plate of the 650 has alot smaller bore then the 750. So you would have a flat lip at the bottum of the main body where it meets the base plate. That will cuase a lot of turblence in at the bottem of the venturis. I think your asking for alot of probs by doing this. if you go to a few swap meets you can normally pick up a carb in need of a rebuild for less then $100. just make sure that no 1 has molested them. ( I have seen some pretty nasty things done to carbs by so called "tunners") I hope that makes sence... I am still way to hung over.

[1978 Rogers]

Here is a link to Jeg's web site that has both of those I was talking about.
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=476412&prmenbr=361
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3853&prmenbr=361
I guess I'm a little confused by you saying the base plate will cause some restrictions.

[YeLLowBoaT]

the base plates for 4777, 4778, and 4779 ( 650 700 and 750) all have diffrent size butterflys as well as ventruis. how to explain it..... redneck explation its like nascar when they use the restricter platesto decrease airflow in to the motor. but in this case the restricker plate is the base plate. A better way to explain it you have 2 peices of pipe one is 3/4" in diameter the other in 1" if you slide the peice of 3/4" pipe into the 1" pipe about 1 inch. what your left with is a lip on the inside of the 1" pipe which is the 3/4" pipe. so you have a output of 3/4" and a input of 1" the pipe is going to flow alittle less then a 3/4" pipe do to the turblence cuased by the 3/4 " pipe instered into the 1" pipe. sorry I am still way hung over.

[FASTRAT]

i agree with Yellow...go visit some swap meets...go to EBay...go to Racingjunk.com....spend the $$$ to find a 750cfm DP...they are out there & cheap...just shop around...u wont be dis-appointed
fastrat

[1978 Rogers]

Gotcha. There advertisement is decieving. The change won't be the same as they claim. I'll wait like you all said. Thanks
Chris
P.S.
Yellow, the Alki-Seltzer Morning Relief really helps me out. Along with some Dramamine. Good luck on the hang over.

[Floored]

you can use the 750 body with an 850 baseplate and it will flow even better. billet baseplates aren't too expensive nowdays and use either the holley or proform body.

[1978 Rogers]

you can use the 750 body with an 850 baseplate and it will flow even better. billet baseplates aren't too expensive nowdays and use either the holley or proform body.
Cool, I'll keep that in mind. I don't know what I'm going to do.

[donzi22]

I have a 750 vaccom secondary that I will sell you with a new carb kit for $100 delivered.

[SmokinLowriderSS]

I have a 750 vaccom secondary that I will sell you with a new carb kit for $100 delivered.
That's what I would do, but I am already running a 700CFM 4150 mech secc.

[malcolm]

Hey Chris, the only thing I'll add is that the Monroe swap meet is this weekend. :D

[1978 Rogers]

Are you going. I might be able to get away. :rollside: Might is the key word.

[Jet City]

Here is a link to Jeg's web site that has both of those I was talking about.
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=476412&prmenbr=361
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3853&prmenbr=361
I guess I'm a little confused by you saying the base plate will cause some restrictions.
Chris, that P/N 778-67100C will work fine for your 650 (list 4777), that part will work fine for all 650-800 double pumpers (as stated in the add) as they all use the same base plate (and bore diameter), the venturi size in the main body is what dictates the CFM difference between list 4777-4780 carbs, the 600 and 850's are the only one of the bunch that use a different base plate bore diameters, you can reference the bore diameters for all double pump list numbers on Holley's site. I plan on using these roform 750 bodies on the 4777's I'm running too, I think they're a nice piece for the money.

[malcolm]

There you go Chris, I figured Scott would have some good advise for you. Yeah, I'll probably hit the meet Saturday (if it isn't too wet). :)

[sanger rat]

If you don't like the purple you can get red baseplates here. http://www.aedperformance.com/Billet.htm