Whats the difference?
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Junior Member
Joined: Oct 2004
Posts: 61
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From: Virginia
Car: 2001 Z28 camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Whats the difference?
I'm kinda stumped. I just bought a Holley 650 DP part number 4777-5. I looked it up on the holley website and there are six different 4777 carbs. There is a 4777, 4777-1, 4777-2, and so on till 4777-5. The part numbers on the primary and secondary metering blocks are diff, so is the part number on the primary and secondary fuel bowls and the throttle body and shaft assembly. So I went to summit to try to find these parts to maybe see what the difference is and I couldnt even find replacement parts for the 4777-5. So, what's the difference?
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Joined: Jan 2000
Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
There might be slight differences in the castings over the different versions, but they should be pretty similar.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
http://www.holley.com/HiOctn/ProdLine/CarbList.pdf
The 4777 used different jetting & different squirters as well. Later models also have PV blow-out protection (not sure when that started).
Otherwise, not sure of why the different dash #'s. As Apeiron said, probably minor casting changes, or other manufacturing updates or changes.
The 4777 used different jetting & different squirters as well. Later models also have PV blow-out protection (not sure when that started).
Otherwise, not sure of why the different dash #'s. As Apeiron said, probably minor casting changes, or other manufacturing updates or changes.
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