private1i

Hey got this holley for free the other day when I picked up my 400. only thing that I could find that would ID it is a number on the base 12R-4770B. There is no choke provision and it has vac secondary. If you need a photo to ID let me put it back together and I will snap a few. thanks

Apeiron

Is there anything stamped on the airhorn?

RB83L69

You need this number right here....

then look it up here http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

private1i

yep looks exactly like that but no air horn. wasnt shaved off. looks factory. I have been to the holley page but no luck. thanks

Stekman

If it looks just like the one in the picture RB posted, it doesn't have vac. secondaries.

If the "4770B" came off of the baseplate, unless it has a strange mix and match of parts, that narrows it down to the 650-800 cfm double pumper as 4770 is the part number for the baseplate, IIRC.

private1i

I guess the best way to do this is to get a picture. now this is just cobbled back to gether as when I got it it was loosely assembled. although all pieces were here it needs a rebuild.

private1i

As you will notice when it came to me loosely assembled the secondary metering block was not attached. On disassembly I noticed this plate on the main body.

private1i

Here is the missing secondary metering block that was in the box of parts that came along with the carb

private1i

ack I mean here is the missing secondary metering block.
well even if it does need a good go through cant beat the price

Stekman

kind of hard to tell bit it LOOKS like the air horn was milled off.

private1i

If they did then that is the best machine work I have ever seen! but anywaays there are no machining marks or anything. Just looks too factory to have been milled.

RB83L69

Current production carbs have their numbers here.... yours obviously doesn't... so it's just a matter of looking at the pieces it's built out of, and the assembly is merely the sum of those parts....

private1i

Well thanks for the help. Guess I will just goto my local speed shop and get the parts I need to rebuild it.

Chuck Hartley

i have one with same stamp and its a 4150 series 750cfm model 4779-7 shiny metal mechanical linkage. i have come to believe that many square bores use the same base plate. also size can easily be determined by the last digit of the model number ie: 477"9" is a 750 cfm and 477"8" is a 700cfm etc. here is a good link i found...
http://minuit10.net/EngineCode/holle...yCasting2.html

five7kid

iTrader: (14)

Good info, but I'm not sure if the original poster still needs the information 8 years later...