Okay, a 4GC is not a spread bore carburetor.
Fuel lines and antifreeze
- Thread starter Iowa409
- Start date
interesting, I wonder if the square bore spacer/insulator I bought was labeled wrong? Something is off? because I grabbed another square bore spacer, same thing. You guys know more than me, this is my first 409 BUT, i must be really confused because the spreadbore stuff fits?
Can you post a picture of what you have?
The bolt pattern may be the same as a spread bore but the throttle blades are not that large on a 4GC for the secondary's
The bolt pattern may be the same as a spread bore but the throttle blades are not that large on a 4GC for the secondary's
These three early versions were, for the most part, the same units internally. As we mentioned, the Quadrajet is a spread-bore design carburetor, using 1-3/8" primary bores and 2-1/4" secondaries. The smaller primary bores give the carburetor better idling and low-load fuel economy.
Rochester Quadrajet carburetors | Hemmings
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?????
Yes when I get home later I can lift the hood and snap a pic, I do not care as long as the car bolts together and fires up, lol but I do like to know what I am spouting off about if I am going to say it, so this is for purely education purposes for me at this point, thanks guys.
Same thing I have , exactly, a spread bore 4 GC, lol, mine is the one on the right side in your pic.
The one on the right is not a spread bore.
Well you boys know a lot more than me on these engines, thats why I come here, for education and learning and a few of you are pretty cool too, lol
BUT is there not different size, openings, indicating its a spread bore?
Yes, the one on the left is a spread bore.
A square bore carburetor can have different size throttle blades from front to rear, but is still a square bore if that makes sense.
I'ma gunna knowd this stuff bie 2nite, lol sorry guys, my point is to get the car running and know what I am talking about.
Everyone who has commented has told me I am off base, and that must mean I am, just have to wrap my head around the things I am reading on the websites, etc. so for clarification what makes a spread bore a spread bore, and visa versa on square bore? please
I happen to think of something and maybe you guys will tell me , its not possible but I do want to throw this out there.
This 4 GC was sent out and rebuilt and made pretty and, supposedly $1500 invested in it to make it new, this was how I bought it and it did look very good 5 years ago, is it possible that the carb shop would be able to attach a spread bore base plate on it making it a bastard type carb? My intake also fits this foot print? The carb shop did not have my intake?
This 4 GC was sent out and rebuilt and made pretty and, supposedly $1500 invested in it to make it new, this was how I bought it and it did look very good 5 years ago, is it possible that the carb shop would be able to attach a spread bore base plate on it making it a bastard type carb? My intake also fits this foot print? The carb shop did not have my intake?
WRONG!!!!!!!!!
Thats what everyone I hear and respect is saying, but my eyes and fitment is telling me something else.
When I get home I will take pics, my carb is definitely the one in the pic on the right.
The 4GC has the small bolt pattern like an AFB would have and be the same bolt pattern as a spread bore but the secondary won't match up. The Holley 4 barrel has a larger bolt pattern.