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340 vs 360 4bbl intake #149124
11/11/08 01:40 AM
11/11/08 01:40 AM
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl Offline OP
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Scott Carl  Offline OP
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Omaha, Nebraska
Is there a great deal of difference if any performance wise between the two? I have an AVS I want to but on my '74 318. Either should bolt up correct? But I've been told the 360 will be easier to find in my area and cheaper too. Just curious about the difference in performance if all other factors are equal. Thanks for input

Re: 340 vs 360 4bbl intake [Re: Scott Carl] #149125
11/11/08 01:47 AM
11/11/08 01:47 AM
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Today? Who Knows?
1_WILD_RT Offline
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1_WILD_RT  Offline
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Today? Who Knows?
Cast iron 360 intake is going to have a Thermoquad flange...Square flange was last used on 70 340...Easiest square flange (AVS/AFB/Holley) to find would likely aftermarket aluminum...

Re: 340 vs 360 4bbl intake *DELETED* [Re: 1_WILD_RT] #149126
11/11/08 02:10 AM
11/11/08 02:10 AM
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Upper Midwest
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MoparforLife Offline
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Re: 340 vs 360 4bbl intake [Re: MoparforLife] #149127
11/11/08 02:31 AM
11/11/08 02:31 AM
Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY Offline
Truck Nut
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Kent, Wa
Quote:

There are 360's thermo pukers too.




Didnt 1 WILD RT mention that

and even tho the 340/360 intake will bolt to a 318 they have larger intake ports.where the 318s are smaller..


I am truckless..
Re: 340 vs 360 4bbl intake [Re: 340SHORTY] #149128
11/11/08 03:14 AM
11/11/08 03:14 AM
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Posts: 5,163
CT
GTX MATT Offline
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Yeah youre going to loose some throttle response with a 340 intake. Youre probably best off picking up an Edelbrock Performer 318/360, its designed for 318 ports, plus it will save some weight.


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: 340 vs 360 4bbl intake [Re: 340SHORTY] #149129
11/11/08 12:22 PM
11/11/08 12:22 PM
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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69L78Nova Offline
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Quote:

There are 360's thermo pukers too.




The only people that call them that, are people with no brains that dont know how to work on them.


1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
Re: 340 vs 360 4bbl intake [Re: 69L78Nova] #149130
11/11/08 12:26 PM
11/11/08 12:26 PM

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Quote:

The only people that call them that, are people with no brains that dont know how to work on them.




..or have had the plastic bodies warp on them rendering them useless and pissing gass all over a hot intake creating an inferno under the hood.

Re: 340 vs 360 4bbl intake [Re: 69L78Nova] #149131
11/11/08 12:28 PM
11/11/08 12:28 PM
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Upper Midwest
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Oh I don't know that I have no brains. I have seen too many with warped and cracked bowls that cannot be repaired to call them good. When they work they are fine and dandy. If they have made it to your day they had to have been one of the good ones. A good many didn't make it.
I wouldn't go on calling names or making insinuations. Probably worked on a lot more than you have seen.

Re: 340 vs 360 4bbl intake #149132
11/11/08 01:04 PM
11/11/08 01:04 PM
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CENTRAL MINN
1965_PLYMOUTH Offline
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CENTRAL MINN
Quote:

Quote:

The only people that call them that, are people with no brains that dont know how to work on them.




..or have had the plastic bodies warp on them rendering them useless and pissing gass all over a hot intake creating an inferno under the hood.




I too, have seen too many leaking ones to be a lover of them. I do notice though that the small block ones do seem to hold up much better. the heat coming off the big block engine was too much for this carb.

Re: 340 vs 360 4bbl intake #149133
11/11/08 01:23 PM
11/11/08 01:23 PM
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Posts: 2,327
Glendale, AZ
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69L78Nova Offline
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Quote:

pissing gass all over a hot intake creating an inferno under the hood.




I guess a Holley never did anything like that. Youre forgetting the potential of the TQ. Youre also forgetting that the oldest production TQ is roughly 38 years old now. Every carb you come across isnt going to be like brand new. I have always run them on street cars, and I have seen them on deep 10 second race cars.

So go plop your big double pumper Holley on your mild 318/360, and while your floats are getting stuck, and your power valves are blowing on your way to work in the morning....Ill be cruising down the road getting good gas milage, driveability, and a nice factory look....plus a sound you cant beat at WOT!


1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
Re: 340 vs 360 4bbl intake [Re: MoparforLife] #149134
11/11/08 01:24 PM
11/11/08 01:24 PM
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
6
69L78Nova Offline
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Quote:

Probably worked on a lot more than you have seen.




I wouldnt bet the farm on that hoss


1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
Re: 340 vs 360 4bbl intake [Re: 69L78Nova] #149135
11/11/08 01:27 PM
11/11/08 01:27 PM
Joined: Nov 2003
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Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
Hi Scott. I would get a square bore 318 one for the ports to match. With the lack of cubes you wouldn't want to have any mismatch of parts that would hurt you if you can help it.


live every 24 hour block of time like it's your last day on earth
Re: 340 vs 360 4bbl intake [Re: 69L78Nova] #149136
11/11/08 01:41 PM
11/11/08 01:41 PM
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Upper Midwest
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Well these things were warping and cracking within a very short time of being new so it didn't take 30+ years of deteriorating to do the damage and warp and crack the bowls. There were more bad ones come in than good for repairs/replacement. If you were lucky and goe a good one they were great but--------------
PS: I am not a lover of Holley double pumpers on the street either. But over the last 40+ years have had a lot less problems with Holley carbs than Thermoquads. If you like them fine use them. If you find a good one.

Re: 340 vs 360 4bbl intake [Re: RapidRobert] #149137
11/11/08 02:35 PM
11/11/08 02:35 PM
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl Offline OP
pro stock
Scott Carl  Offline OP
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Omaha, Nebraska
Quote:

Hi Scott. I would get a square bore 318 one for the ports to match. With the lack of cubes you wouldn't want to have any mismatch of parts that would hurt you if you can help it.




Thanks Robert. Is the mismatch what would cause the loss of throttle response with a 340 intake that GTX Matt spoke of? Could any of that be salvaged by grinding the ports to match the manifold?

Thanks

Re: 340 vs 360 4bbl intake [Re: Scott Carl] #149138
11/11/08 02:42 PM
11/11/08 02:42 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

Is the mismatch what would cause the loss of throttle response with a 340 intake that GTX Matt spoke of? Could any of that be salvaged by grinding the ports to match the manifold? Thanks


yes and yes but the port difference is substantial & you will be MUCH better served to get a 318 unit(cast or alum) as they are cheap & that way your time could be put to better use on another area that would reap more benefits for you for the time spent.


live every 24 hour block of time like it's your last day on earth
Re: 340 vs 360 4bbl intake [Re: RapidRobert] #149139
11/11/08 03:09 PM
11/11/08 03:09 PM

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I've run a 750cfm 3310 vacuum secondary Holley on a number of different cars/engines/setups that are driver type vehicles.

The only time a power valve ever blew was when the car wasn't tuned right right after a rebuild.

Oh yeah, at least I can get parts for said Holley when/if I need them.... ...but I usually don't.

Where, again, can you find a new main body for a Thermobogger?

While your fixin' I'll be

Re: 340 vs 360 4bbl intake #149140
11/11/08 03:42 PM
11/11/08 03:42 PM
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Upper Midwest
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Quote:

I've run a 750cfm 3310 vacuum secondary Holley on a number of different cars/engines/setups that are driver type vehicles.

The only time a power valve ever blew was when the car wasn't tuned right right after a rebuild.

Oh yeah, at least I can get parts for said Holley when/if I need them.... ...but I usually don't.

Where, again, can you find a new main body for a Thermobogger?

While your fixin' I'll be



Re: 340 vs 360 4bbl intake [Re: MoparforLife] #149141
11/11/08 03:50 PM
11/11/08 03:50 PM
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Paul_Fancsali Offline
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I suggest a rochester Q jet. They run great and are tuned for a mild small blockand they are available threw many sources. Referring to the holleys as power valve pukers those are few and far between and the holley is one of the easiet carbs to work with the needle and seat are right on top. I own and have used all the carbs that are mentioned here other then the predator. But for a spread bore I suggest a q jet

Re: 340 vs 360 4bbl intake #149142
11/11/08 06:23 PM
11/11/08 06:23 PM
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
6
69L78Nova Offline
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Quote:

Where, again, can you find a new main body for a Thermobogger?






I happen to have 4 of them...brand new. I have over 40 Thermoquads, and MANY parts....so I think Im pretty safe


1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
Re: 340 vs 360 4bbl intake [Re: 69L78Nova] #149143
11/11/08 06:39 PM
11/11/08 06:39 PM

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The factory 318 4 barrels used the 360 intake manifold. I wouldn't hesitate to use the factory iron manifold on a 318. The factory 340-360 manifolds were a great design, many aftermarket manifolds show a power loss in comparison.

Sheldon

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