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Big Iron
holley list 3310 #3878261-EH date 8/6/1 ??
any help would be appreciated to break down code ,i have a 780 holley carb list # 3310 gm stamped 3878261-EH ,base plate # 12R 2916 B ,big block ?,small block ? car or truck it was born on ,thanks
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Lifetime Premium Member 
Join Date: May 1999
Location: Under the hood of some musclecar
Posts: 28,219
Re: holley list 3310 #3878261-EH date 8/6/1 ??
over the counter carb
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Lance
Gray Ghost II
Re: holley list 3310 #3878261-EH date 8/6/1 ??
This carburetor number was originally listed for the 1965 Z-16 Chevelle (375hp/396), the date will indicate if an original issue Z-16 carb (rare) or the much more common one sold over the parts counter to half of the Chevy enthusiasts in the US. My experience with MANY dyno pulls on a 406 CID SBC was it was hard to improve on as delivered over the counter. There were some small improvements we made after many dyno pulls, but you really ought to have access to a dyno if you decide to alter jetting/air bleeds, etc. When these were right it was tough to find a better 780 cfm carb at the time. I still look for them at swap meets.
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Shane
Join Date: Oct 2006
Location: N.E.Pennsylvania
Posts: 6,923
Re: holley list 3310 #3878261-EH date 8/6/1 ??
I have one of those on the shelf too.
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New oil is cheaper than new parts
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Tech Team
Re: holley list 3310 #3878261-EH date 8/6/1 ??
thanks for info ,are they worth anything ,i have the base plate to
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Mutant
Re: holley list 3310 #3878261-EH date 8/6/1 ??
I have one too,we're all gonna be rich .............
John
71 El Camino SS
406 SBC M21 3.31 12 bolt
"Quality is always remembered,long after the price is forgotten"
Lifetime Premium Member
Shane
Join Date: Oct 2006
Location: N.E.Pennsylvania
Posts: 6,923
Re: holley list 3310 #3878261-EH date 8/6/1 ??
Shucks, I'll lower my sale price to $1500.
j/k
j/k
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New oil is cheaper than new parts
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Senior Tech Team
Eric
Join Date: Sep 2011
Location: wisconsin
Posts: 1,957
Re: holley list 3310 #3878261-EH date 8/6/1 ??
I have one that is dated 1972. I picked it up from a buddy in high school, thirty years ago. I've had it on numerous cars with everything from a street/strip 468 to a stock 350, still one of the best carbs I've owned.
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