Carb Identification

[Bigjohnboy]

Hi I wonder if someone could help identify the Carburettor its on a 67 Camaro with 454 Big block

Thanks

[steviejasp]

Looks like a Holley 850 double pumper

[Bigjohnboy]

Wow that's a fast response thanks

[roscobbc]

Performance item - it has centre-hung float bowls - if you take a look on the air horn you should find I.D marks - do a Google search on these and you should be able to find out A. if it was a OEM fitment to a car B. what cfm it is and what jets etc were originally fitted if an 'over the counter' item. It looks dirty and dusty - could well be knackered!

[Bigjohnboy]

Thanks for the reply will look at this at the weekend, carb is working fine just trying to identify all the bits on it. Definitely needs a clean up though !! I can't see any chokes on this is that correct ?

John

[steviejasp]

It's been a few years since I had one of these but mine didn't have or need a choke

[roscobbc]

'Race' and performance carbs do not generally come with choke - someone may have milled it off if originally fitted - as other poster said choke is not needed - just a couple of pumps or the gas pedal and 'feather' it till it warms up a little.

[heightswitch]

Buy the speedpro holley carb book..Very good for stripping down and re-building.
Its deffo a double pumper, It deffo has centre hung floats It also has a secondary metering block.
4150 designated carbs are good.
That looks like a good bit of kit you have there for a big engine, from a drag or race car.

Double pumpers on a street car tend to run too rich and wash the bores if you are not careful.
N.

[roscobbc]

As the man says - DP especially with auto TX is potentially a dubious choice unless on a lightweight car with high numerical rear axle ratio - whilst a 'performance' carb things have moved on somewhat - your unit only has idle screws for primaries - most aftermarket generic 'Holley' type carbs now have ' 4 corner' idle screws - (one for each choke) and removeable/replaceable idle bleed jets - makes carb tuning far easier if you have a 'hot cam' and resulting low engine vacumn.

[Bigjohnboy]

Thanks for the replies so far very interesting have written to the owner before last to hopefully get some more spec on the engine etc took one of the rocker covers off the other day found these

[roscobbc]

That looks 'promising'!