302 vs. cfm

[Toby the Dancing Bronco]

I was just reading about carb replacements, and someone hit a note I had not heard before, in this context. As an old drag racer, I have used 650 to 780 cfm carbs ontricked out 289-392 go-fast engines. I have a 74 EB with the stock carb/intake, and it lacks. The 302 has about 35,000 on it, and is pretty stock. The writer stated a 470 cfm would work well, as most people over estimate the amount of flow needed... What are the things needed to make the determination of cfm figuring for torque and economy? I have been looking at the new Holley Truck Avenger, but don't want to waste any of that fossil fuel. Any advise would be helpful. There's only so many dollars to spend, and I don't want to spend twice on the "better way to go." I wan to go there first. Thanks

 

[S_bolt19]

If you are looking to do anything off road, I would recommend not going with a Holley. There are some guys out there that will contradict me on this but I have used the Holley and it loaded up EVERY time I was on an incline. For the $4-500 you will spend on that carb, I would say go with a Carter or stay with the original FoMoCo carb. They tend to have better pumping ability on off camber climbs. But if you really want the ulitmate set up, do an EFI or SEFI conversion. If you have mechanical skills you can find writeups all over the internet for them that are pretty basic and easy to follow. I think that Bronco.com has a decent one.

But if you intend on just driving it around, well I never had a complaint with my Holley. It would get up and run with the best of them. It was just scarey on the side of a hill.

 

[stubby]

i tend to agree with s bolt.... i've gone through holley inventory trying to get carbs to work, i even tried the holley fuel injection kit- never had any luck.. i couldn't get it leaned out enough trail riding- i like the TPI set up for four wheelin'.

 

[Bully Bob]

I think the carb you're looking at is "the new kid on the block"

"Truck Avenger" See if you can find someone that's used that particular carb. & give you some feed-back.

The reg. holleys are more race ready & not meant for rough road use.

Yah, some do over carborate & lose performance... (

 

[Seabronc]

If you want to read a real good article on carborators that is packed wit great info, click on this http://www.442.com/oldsfaq/ofcrb.htm . It is from a Olds site, but don't let that get in your way /emoticons/[email protected] 2x" width="20" height="20" /> the guy knows what he is talking about.

Maybe with the aid of that information you can make a good decision based on how you are going to use the truck.

Good luck,

>-

 

[Toby the Dancing Bronco]

That was what I was looking for, and thanks. I read the first 7 pages worth then just hit Print. I am helping my neighbor with his 67 El Camino w/ 327, and we are at the carb selection step, so this was timely and extremely helpfule. Thanks!