hi, i was wondering if a stock 4bbl manifold off of a 352 will work on my 360. also i was wondering what carbs people preferr, i like edelbrock, but what cfm should i get i have ben told 600 cfm if i want good gas mileage and horse power, which i do. i'd appreciate your advice

 

.........YES it will work, the early years from the late 50`s had the oil filler at the front of intake and a down draft tube at the back of the intake manifold but other then that they are the same. A 600 cfm is plenty for a stock 360. By using a 4 bbl, if you can keep your foot out of it you should get a little better milage by staying on the smaller front bbls but if you open the back bbls your milage will drop fast. Very fast!

 

Watch your intake port sizes when swapping those manifolds. My old 352 4bbl intake has ports about 1/4" taller than my heads. This could cause airflow turbulence, reducing horsepower.

 

Custom, The intake is a direct bolt on, but I can't advise you to do it. The 360 is a detuned engine to start with, but is a pretty good ol truck motor as is. A good flowing dual exhaust will give you most of what you can expect from the engine. Rebuilding it, converting it to a 390 and you have a different deal all together.

I have run an Edelbrock 1406 on my 352 and have been highly disappointed in the performance. We recently installed a Holley 390GT 600 cfm carb and I couldn't believe the difference, like two different trucks. I have just installed a Holley 390 cfm 4 barrel and so far it seems to perform about as well as the Edelbrock. One poster said that when I hook my big trailer up to it again I'll be able to see the big picture clearly.

I started off only getting 10 mpg with the 1406, I got a little test in with the 390 and soft peddeling and got a touch over 14 mpg.

Stick with what ya got.

John

 

John, what exactly did you notice different about the performance with the Holley vs the Edelbrock carbs?

 

The four barrel intake and carb will make a big difference in the performance of that 360. My dad made that swap in his 72 4x4 when he bought it new and it ran great for over 200,000 miles when he decided to swap in a 390.

 

The Holley 390GT 600cfm made my engine turn rpms fast and a make the hair stand up on the back of your neck sound, and your palms sweaty. The Edelbrock 1406 has only been marginal in performance. The 390 cfm Holley that is on there now closely resembles the 1406 but is getting 14 mpg with soft peddeling. I couldn't run the GT because I couldn't stay out of it. "I gotta have me some more of this".

John

 

the 360 is "detuned"? I have a stock 360, when I rebuilt it I put the Edelbrock performer 390 intake and a 650 carter on top. I tell you there is a BIG difference from stock. it may not "stand the hair up" so to say....but it make a HUGE difference in torque and pulling power. I can lite 'em up at will, but when I hook up, it isn't that impressive (0-60 is still like 6-7 sec or so), I don't yet have headers or free flowing exhaust, but I did notice a big difference in power when I went from single to dual exhaust.

let us know how it turns out.

 

Yeah the reason I asked is because I put a 1406 on my 302 at Christmas time (it was a gift). The truck runs much better with the new carb. ,compared to the old 2 barrel, in the way of cold weather starting, smooth idle, good throttle response. That might be due to the fact that it's a brand new carb. vs one that is 33 years old.

My previous experience with 4 barrels is limited to chevys with Q-jets an I was expecting a noticable kick-in-the-pants and a change in sound when the secondaries opened. But I don't get any of that with the 1406. Some people say that it is a smoother transition. I guess it is so smooth that it is hard to detect any effect at all.

The knock that I have heard about the Holleys is that they require a lot more tuning to get them set up right. What do you think about that?

 

I like the Holly for the power, but all stories have been that they require a lot more attention to keep it. I like my carter for a DD, but would like to get a 750 or something like that. now if you want performance AND reliability, then get a DEMON carb. Street Demon is one of the best carbs on the market to date for daily driving and weekend racing. it is based on the holly design, but is much more reliable requiring a lot less tuning. it is a little more expensive than your traditional carbs, but in my eyes, well worth it. I may get one to replace my carter when I decide to do it.

 

I'm finding the 1406 is a little rich for my stock 360. I wanted their 1405 and after reading the book i came with it is only leaner jets in the primary's. I had a great improvement in responsiveness and I do hear the secondary's but only at higher RPM's. I am actually interested if anyone has changed those jets because a stock 360 600 cfm is a little over kill. All I have is a K&N in the stock yet snorkeled air box and dual exhaust no headers.

 

bookman the 1405 & 6 are the same base carb. The 05 is manual choke and the 06 is electric.

John

 

Well i cant exactly stick whith what i got, because my carb that i have on it right now is pretty much shot, but if i am spending the money i would like to know wether a 4 or a 2 would be better, and i am in high school, so my job is not going to be able support as much gas as i would like it too, and at the same time im not sure wether i could stay out of the 4 bbl. I do run headers and dual 2.5 inch pipes runnin through some galss packs. Dont have the money to swap to a 390 or convert mine to a 390 at the time, but in the future if i am spending the money, should i get a 390 or should i get something bigger?

 

You need to go to NAPA and get a rebuild kit for your existing carb. I can tell right now that you wont be able to stay out of it.

A good new intake and carb will run $500.00-$600.00.

John

 

I rebuilt it 2 weeks ago, and it still runs like crap, and it wont warm up for about 6-7 minutes, and dies if it is not fully choked until its warmed up, and i know it shouldn't take 6 or 7 minutes before it will corectly run