Whats the best intake manifold for me???

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lucahemi

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I have a 72 demon 340. holley 750, mild cam in it, x heads, 10.25:1 compression, tti headers with 2.5 in. x pipe exhaust. open air filter top hat with k&n filter. havent finished the resto yet. just wondering what intake manifold i should get... Holley? Edelbrock? other brands? model? whats the best youve found. thanks

PS: what hp should i suspect? just wondering...
 
Luca, you have not given enuff info on this engine or set up to comment.
 
haha do i really sound like that video??? List what information are you looking for and i will provide. Thanks
 
lucahemi said:
I have a 72 demon 340. holley 750, mild cam in it, x heads, 10.25:1 compression, tti headers with 2.5 in. x pipe exhaust. open air filter top hat with k&n filter. havent finished the resto yet. just wondering what intake manifold i should get... Holley? Edelbrock? other brands? model? whats the best youve found. thanks

PS: what hp should i suspect? just wondering...
Click to expand...

Mild cam? Is a term used by those who have used a bigger cam or thinkn there cam is on the mild side. This is "Opinion" by the end user. :headbang:

List the cams specs;
The timing events if you have them.
Advertsied duration, duration @ .050, valve lift, centerline, intake centerline and overlap. This info is normaly found on the cam card. If not, check cam grinders web site for more info.

Heads; Iron or Aluminum, maker? Valve size. Stock ports or ported and if so, how much/far? The flow rates in cfm if you have them.
 
Ok the car is at my dads house i cant tell you about the cam until this weekend but when i said x heads i meant in 72 they had the low compression j heads (correct me if im wrong) and the earlier 340's like 68-71 or somethin had the better heads they are cast iron i think...no porting done but when the cam went in it had to get some heavier springs etc in the head i will try to find out more information, thanks for the help. any knowledge anyone would like to share is much appreciated.
 
X and J heads were the same in terms of compression. The compression difference was the pistons. Like rumblefish said, without much more information, you're pissin in a fan.
 
The Edelbrock Performer RPM, and the Edelbrock RPM Air-Gap are great intakes.
I run the RPM Air-Gap on my 340. If you live in colder climates you might not want the Air Gap version.
 
okay so your saying the x and j heads are the exact same and one doesnt have any benefits over the other? i live in the chicago area andi dont plan on driving it in cold weather so this shouldnt be an issue??
 
If the valve sizes are the same, yep!
Driving it in the cold will not be an issue with ethier head. The intake is the point of issue made. The Air-Gap has no heat provision to warm up the intake for better cold weather drivabilty, the regular RPM does.
 
lucahemi said:
okay so your saying the x and j heads are the exact same and one doesnt have any benefits over the other? i live in the chicago area andi dont plan on driving it in cold weather so this shouldnt be an issue??
Click to expand...

No, that's what you inferred not what I conveyed. I said they were the same as far as compression. All X heads....that I know of anyway came with 2.02 intake valves. Only some of the J heads came with the 2.02 valves. If you compare X and J heads both with 2.02 valves, again rumblefish nailed it, in that case, they are both the same. Does that help?
 
...and as for intake, which is what you were askin about, what's your budget? If it's tight, you might wanna look around for a standard Edelbrock Performer. They can be had used really reasonably. The air gap is pretty costly. It's a great intake, it just costs some coin. what carburetor are you gonna run? What kinda experience do you have with tuning? If you can give us a little more about what you can do, we can point you in a better direction. Even if you have little to no experience, with good advice, you can whip somethin up that's pretty nice as long as you know which end of a wrench is which.

Nevermind. I went back and saw you said Holley 750. That's a good carburetor and probably spot on if it's a vacuum secondary carburetor. They will usually run well outta the box with minimal tunin. The air gap will work best, but as I said, if budget is a concern the Performer will not be a slouch.
 
yeah it is a vacuum secondary. my dads a mechanic and my neighbor... where the car is at is an even better mechanic im 18 years old and have been into working on dirtbikes etc alot of my life no so much cars, i know how alot of it works just not alot of the specifications on stuff like the difference between x and j heads for example. it has the stock intake right now so i wouldnt want to spend over 200ish. i know im backtracking here but do you think an intake is really worth it? again any knowledge is appreciated. Thanks
 
the factory intake is not a bad at all.if you dont want to spend a bunch of cash id look for something used like performer rpm or an ld340.both of those will work on a stock 340 as well as a fairly "healthy" build.
 
Go with an airgap, don't think you'll be disappointed. I had a performer RPM and it worked very well also.
 
lucahemi said:
yeah it is a vacuum secondary. my dads a mechanic and my neighbor... where the car is at is an even better mechanic im 18 years old and have been into working on dirtbikes etc alot of my life no so much cars, i know how alot of it works just not alot of the specifications on stuff like the difference between x and j heads for example. it has the stock intake right now so i wouldnt want to spend over 200ish. i know im backtracking here but do you think an intake is really worth it? again any knowledge is appreciated. Thanks
Click to expand...

IMHO, the stock intake is head and shoulders above the standard Performer...even taking into account the weight difference. There's just somethin about those old iron beasts that flow like ***** in church. I wouldn't change it if you're worried about the extra money. The air gap would really benefit you more in the higher RPM ranges anyway. So....it has a stock intake with a Holley? Then it has a Thermoquad intake with a spacer? Getting that spacer gone will net you some bottom end HP and torque. But....that means going to a TQ. They are great carburetors. I recommend them highly and for just your kinda build.....but you have to know how to tune them. If your dad or neighbor knows about them, I would try to snag one.
 

cjh said:
You could use one of these.
Click to expand...

I used that set up for a long time. Great when your running the right cam and rear gear.

lucahemi said:
found out this is the cam im using a comp cams purple cam... any idea on hp now?

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=641&sb=2
Click to expand...

One last question, are your heads ported and what valve size.

IF I assume (Hate that word) that the heads are stock w/2.02/1.60 then I'll state 360 HP.
If the heads are VERY well ported w/ large tube headers, you could produce 460 HP

That cam is very similar to the old 1st gen MoPar create engine. The 360/360hp create engine. They used the purple 284/.484/110 cam. The head was a stock "308" head w/2.02's.

IF your going to cruise around town some, then I suggest a RPM intake.
If your going to do light racing in a lightened car, 3000 rpm converter, 4.30 gears, the above TorkerII 340 intake isn't a bad choice to use since your ignoring torque production under 3000 rpm. Often found very inexpensivly here or on the net.
Or the $250 or so for a new RPM.
 
thanks rumblefish! no the heads have not been ported, just a fun car to take to cruise nights and lay some rubber with. putting the carpeting in this weekend we found out the heater core was leaking! luckily the old dodge only had a few bolts holding it all in.
 
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