Carb Recommendation
Thread Starter
|
Freshman User
Joined: Feb 2003
Posts: 40
Likes: 0
Carb Recommendation
I was wondering if you guys could give some input on your favorite carb for a 1970 302. I am putting on an edelbrock preformer 302 intake so input on four or two barrels is great!!
Can a 4 bbl get the same mileage as a 2bb?
Are there any advantages to having a 2bbl?
What size carb would you put on?
Any and all input appreciated!
Scott
ps. How many psi compression should this thing have? (1970 F100 totally stock 302)
Can a 4 bbl get the same mileage as a 2bb?
Are there any advantages to having a 2bbl?
What size carb would you put on?
Any and all input appreciated!
Scott
ps. How many psi compression should this thing have? (1970 F100 totally stock 302)
Senior User
Joined: Mar 2002
Posts: 117
Likes: 0
From: Rimbey Canada
Carb Recommendation
Yes A 4 barrel can get you the same mileage or if you can keep your foot out of it even better than a 2 barrel, a holley 450 or 470 would be good or for fuel economy get an adapter and put on a rochester quadrajet from a 305 or 350. My bones stock f100 with a 302 has between 143 and 145 psi in each hole with 100000 miles on it.
Steve
Steve
Senior User
Joined: Aug 2001
Posts: 211
Likes: 0
From: Houston, Tx
Carb Recommendation
In a lot of cases, you can actually get better gas milage when you use a 4-bbl. Let me explain.... Most V-8 2-bbls are about 500cfm, and most 4bbls are around 600cfm. The 2bbl is pumping out 500cfm all the time, but the 4bbl only pumps half what it is capable of most of the time, 300cfm. When you need the power, the vacuum secondaries kick-in and give you full 600cfm.
Personally, I love the Classic 600cfm Holleys. I buy them any time I see one at a swap meet cheap.
These have to be the most popular carbs on hotrods, and you can still get new ones for under $300...
Lots of aftermarket parts to fix them up with too!
Personally, I love the Classic 600cfm Holleys. I buy them any time I see one at a swap meet cheap.
These have to be the most popular carbs on hotrods, and you can still get new ones for under $300...
Lots of aftermarket parts to fix them up with too!
Thread Starter
|
Freshman User
Joined: Feb 2003
Posts: 40
Likes: 0
Carb Recommendation
would you use vacuum or mechanical secondaries?
Which is the most common?
Can i get one of these carbs new?
What do you guys think of the 575 Holley Street avenger?
Which is the most common?
Can i get one of these carbs new?
What do you guys think of the 575 Holley Street avenger?
Last edited by Scott_in_Canada; Apr 21, 2003 at 11:28 PM.
Lead Driver
Joined: Feb 2002
Posts: 7,969
Likes: 595
From: Greater Austin, Texas
Carb Recommendation
A spread-bore 4bbl will typically give the same or better mileage than a similarly sized 2bbl. Vacuum secondaries are better for mileage. The Rochester Quadrajet is the best carb ever devised by man IMO.
Trending Topics
Thread Starter
|
Freshman User
Joined: Feb 2003
Posts: 40
Likes: 0
Carb Recommendation
currently i have done nothing. It is completly stock. I plan on an edelbrock performer 302 intake, headers, dual exhaust. Depending on how all that works out i may have the heads rebuilt and ported exhaust side, larger valves exhaust side.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Posting Guru
Joined: Mar 2003
Posts: 1,622
Likes: 0
From: nevada
Carb Recommendation
You will only want mech secondaries if you are running circle track. On the street if you floor it, it will just bog down if you don't have enough rpm's. you will also use more gas. Just installed Holley 600 on my 390, and was able to dial it in with a spring change on the secondary vacuum valve when it opens to full throttle. If you go that route, make sure you order the quick change kit for that carb. If you have to change springs with the carb on truck, you will be glad you spent the $7.00 for it. Don't know why they didn't put it on there in the first place. Carb with kits (both spring kit and quick change kit) was around $260 at jegs.com
Thread
Thread Starter
Forum
Replies
Last Post
Scott_in_Canada
1967 - 1972 F-100 & Larger F-Series Trucks
8
Oct 31, 2003 08:14 AM
Scott_in_Canada
1967 - 1972 F-100 & Larger F-Series Trucks
1
May 12, 2003 11:56 AM
jmacjr1125
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
4
Nov 27, 2001 10:54 AM