Identify this Carb?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RCOMBS · 03-01-2005, 02:05 PM

I was wanting to know if anybody could identify this HOLLEY Carb. It is a double pumper.. What CFM? Is it a good carb? The only #'s I could find on it is
these.
70645
4778-4
1038

**1970 CST Short Wide** · 03-01-2005, 02:14 PM

The 4778 # says its a 700 CFM. I had a 4777 650 CFM on my small block and liked it

69 longhorn · 03-01-2005, 02:18 PM

Its 700 cfm, but my book is too old (dont have a listing on the -4), so i cant give all the specs on it. You might try the Holley website....

RCOMBS · 03-01-2005, 02:24 PM

How would this Carb work on a 350 w/ mild cam??

XXL · 03-01-2005, 02:25 PM

Quote:

Originally Posted by RCOMBS

How would this Carb work on a 350 w/ mild cam??

Probably a little big, but you could get away with it.

</out of touch with modern carburetor methodology... just going on old knowledge>

**1970 CST Short Wide** · 03-01-2005, 02:25 PM

I would say you might re-jet but would work fine

Paul72 · 03-01-2005, 04:49 PM

It's also a double pumper.

Like 1970 CST said, jet it down and it should work fine.

Check out www.mortec.com - it has Holley carb information and tuning tips as well as a lot of other info..

Paul

03-01-2005, 02:05 PM	#1
RCOMBS Registered User Join Date: Dec 2001 Location: CHARLOTTE N.C. Posts: 59	Identify this Carb?? I was wanting to know if anybody could identify this HOLLEY Carb. It is a double pumper.. What CFM? Is it a good carb? The only #'s I could find on it is these. 70645 4778-4 1038

03-01-2005, 02:14 PM	#2
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,193	The 4778 # says its a 700 CFM. I had a 4777 650 CFM on my small block and liked it __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

03-01-2005, 02:18 PM	#3
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Its 700 cfm, but my book is too old (dont have a listing on the -4), so i cant give all the specs on it. You might try the Holley website.... __________________ http://community.webshots.com/user/hotrodhorn

03-01-2005, 02:25 PM	#6
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,193	I would say you might re-jet but would work fine __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

03-01-2005, 04:49 PM	#7
Paul72 Registered User Join Date: Sep 2003 Location: Waterloo, IA Posts: 1,147	It's also a double pumper. Like 1970 CST said, jet it down and it should work fine. Check out www.mortec.com - it has Holley carb information and tuning tips as well as a lot of other info.. Paul __________________ '72 Chevy K20 - 383/4sp/205 - SOLD after 41 years in the family Next project - K/5 Tahoe (71 Blazer on 99 Tahoe chassis) Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=789958

03-01-2005, 02:24 PM	#4
RCOMBS Registered User Join Date: Dec 2001 Location: CHARLOTTE N.C. Posts: 59	How would this Carb work on a 350 w/ mild cam??



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