[Gary H]

There's a ad on Orlando Craigslist for a RA V Holley carb. Not mine just wondering if that's the right number and if it's real.
https://orlando.craigslist.org/pts/d...073530716.html

[dataway]

Jeez, same one I saw come up on my recent CL search in NY ... was listed some state in new england .. forget which.

[steve25]

I have always wondered if the 303 motors got the same size 800 cfm Carb as the 400s?

[Mike Davis]

These are the numbers I have for the Holley 800 that is for the Ram Air V

Pontiac 303-CID Man Trans 4150 #4546
Pontiac 400-CID Auto Trans 4150 #4486
Pontiac 400-CID Man Trans 4150 #4545

So yes that's a RAV carb,

[tom s]

No contact info.As Mike posted it is a 400 auto carb.Tom

[tom s]

Something does not look quite right with the throttle arm.They are unique and has a bracket that bolts to it.Wish there was a better pic.Tom

[Kenth]

Originally Posted by tom s

No contact info.As Mike posted it is a 400 auto carb.Tom

Actually, Mike posted it as a 303 man carb.

["QUICK-SILVER"]

Isn't that carb suppose to have down-leg boosters?

Clay

[tom s]

Your right,I will look at the boosters in mine,it’s on my V engine on the run stand right now.Going to fire it today.Tom

[Gary H]

This carb may be owned by a gentleman I spoke to a while back that has some pretty rare Pontiac stuff. The ad for the carb shows phone number 989/244-6324 if anybody is interested.

[Half-Inch Stud]

The 4546 is an 800 huh.

so im thinking the 4545 was 1050.
I gots the 4575 dated 1970 and quite pleased with it (being 1 digit off and all).

[Tom Vaught]

#4545A is a 1970 400 cid pontiac carb for a M/T application. GTO and F-Bird.

#4546A is a 1970 303 cid pontiac carb for a M/T application. (Holley book says 302 engine) F-Bird.
Holley Book is 1 cubic inch off

#4486 is a 70 400 GTO and F-Bird with auto trans.

Tom V.

[Formulajones]

Originally Posted by steve25

I have always wondered if the 303 motors got the same size 800 cfm Carb as the 400s?

Same CFM ratings yes. The different list numbers mainly designate a slightly different calibration.

Essentially they aren't really much different than the 780 4053 carbs on the little Chevrolet 302's, which are also often referred to as 800 cfm carbs. I'd bet same diameter throttle blades, bore and base plate.

Very surprised it doesn't have downleg boosters though. All the 4053 DZ carbs have downleg boosters.

[tom s]

the 400s do,maybe the 303 with the 320 CFM heads needed some help?The 400s were said to be 780s.Tom

[Formulajones]

Originally Posted by tom s

the 400s do,maybe the 303 with the 320 CFM heads needed some help?The 400s were said to be 780s.Tom

Ah yep could be Tom, I forgot about the baseball sized ports. Different list number could account for the straight leg boosters.

["QUICK-SILVER"]

Originally Posted by tom s

Your right,I will look at the boosters in mine,it’s on my V engine on the run stand right now.Going to fire it today.Tom

Did you light it off and and a take a look at your carburetor?

Clay

[tom s]

Yep,the 400 has diff boosters.Tom

[PontiacJim1959]

If this helps any. The article states, ".....is a new 800-CFM Holley which has the flow rating of the single four-barrel 396/375 and 427/425 hp Chevys."

I have a 396 Holley and it is the 780-CFM carb that was very popular back in the day.

[Formulajones]

Yep Jim, that's what I was eluding to earlier. Those 780's for the Chevrolets were often referred to as 800 cfm carbs in a lot of literature throughout the decades. So there is a lot of confusion there. People still today refer to them as 800's.

[tom s]

First thing that pic of the intake and carb is not showing a RA V carb.The throttle arm is incorrect.Tom