Autolite 4100 C4GF-AB Carb , what should I do?

289 - 351 cid Small Block Performance

Autolite 4100 C4GF-AB Carb , what should I do?

Postby chaseman » Fri Dec 09, 2016 9:57 pm

Hello everyone , I've come across a Autolite 4100 C4GF-AB carb. Now according to various sources it is a carb off of a hipo 289 4 speed Comet. I'm really curious if anyone has some knowledge about this carb , I'm debating if I should use it or if it belongs on a numbers matching HiPO 64 Comet instead of my 71 F250.

Thank you
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby Groover » Sat Dec 10, 2016 1:07 pm

Just looked this tag up in the Mannel Book and according to that this tag would have gone with a 289 4v with automatic transmission. There are separate tags for HiPo's so based on this, I'd say that this was not a HiPo Carb and that F250 should be just fine.
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby comethead » Sat Dec 10, 2016 1:29 pm

The Hipo carbs were all "O" carbs. C3OF, C4OF and C5OF. O for Fairlane...which was the original car to receive the 289 Hipo.
G indicates Comet.
I bet the C4GF carb is real close to a Hipo carb- the main difference being the boosters. And later on the manual choke.

Joe
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby Groover » Sat Dec 10, 2016 1:36 pm

comethead wrote:The Hipo carbs were all "O" carbs. C3OF, C4OF and C5OF. O for Fairlane...which was the original car to receive the 289 Hipo.
G indicates Comet.
I bet the C4GF carb is real close to a Hipo carb- the main difference being the boosters. And later on the manual choke.

Joe


According to Manel, there were some C4ZF, C6ZF, C7ZF and C8ZF used in Mustang and Fairlane HiPo's

FWIW
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby comethead » Sat Dec 10, 2016 3:11 pm

Groover wrote:
comethead wrote:The Hipo carbs were all "O" carbs. C3OF, C4OF and C5OF. O for Fairlane...which was the original car to receive the 289 Hipo.
G indicates Comet.
I bet the C4GF carb is real close to a Hipo carb- the main difference being the boosters. And later on the manual choke.

Joe


According to Manel, there were some C4ZF, C6ZF, C7ZF and C8ZF used in Mustang and Fairlane HiPo's

FWIW


I shoulda said "some" not "all". Thanks Groover. Gotta get in that book again :roll:
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby Comechero65 » Sat Dec 10, 2016 4:13 pm

Finally found th -AB carb on Mustangtek.Says Hipo but nit sure that is true. And if it were a true Hipo it woulf not be a carb with any economy as they were all jetted for performance. Even still the C4GF carbs are all rare and hard to find and very good choices. I run the C4GF-AF version and am vey happy with it.
Ron
Last edited by Comechero65 on Mon Dec 26, 2016 4:31 pm, edited 1 time in total.
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby 65Autolite » Mon Dec 26, 2016 3:32 pm

The C4GF-AA and C5GF-AB are not HiPo (High-Performance) carburetors. The 600cfm carb. size and "K" in Mercury VIN causes the confusion, especially since those were both characteristics on a 65/66 HiPo (K-code) Ford Mustang.

The information on Mustangtek listing the above carbs. as HIPo is incorrect. The Mustangtek administrators have not been open to making valid corrections when I have contacted them countless times. Same holds true on other corrections with supporting documents/pictures.
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby chaseman » Mon Dec 26, 2016 11:06 pm

Alright , thank you all for clearing that up. I was confused by it being a 600 cfm but the internet saying it was for a 289 , because small blocks usually got the smaller carb unless it was a hipo. But anyhow , I'm glad to get some good info by some folks more in touch with Mercury stuff then I am.

I'll stick the carb on my truck's 390 then , it'll go real nice with my Mercury High Pent Valve covers lol
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby Comechero65 » Tue Dec 27, 2016 4:30 pm

The early SBF's used the 600 cfm 1.12" version on many engines as well as the smaller 1.08" version. The 4100 Hipo carb was intended for all out performance. Economy was never considered.
Ron
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Re: Autolite 4100 C4GF-AB Carb , what should I do?

Postby 65Autolite » Tue Dec 27, 2016 4:49 pm

Even though the C4GF-AB is a 600 CFM the stock primary (stamped "L" on bottom) and secondary (stamped "B" on bottom) boosters were tuned for a 289 application. The stock jetting was #48 on primaries and #55 on secondaries. If it were me I'd probably start with #50's on the primaries for today's fuel and your engine size.
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