is it worth changing intakes?

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rigger3006

rigger3006

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ive got 79 360, stock thermoquad on it, ive got a 72 340 intake, would there be any performance difference if i swap them, or should i just put a performer on it?just looking for idle to 5000 power range. no other mods yet, 701 voodoo cam and headers r in the wings
 
rigger3006 said:
ive got 79 360, stock thermoquad on it, ive got a 72 340 intake, would there be any performance difference if i swap them, or should i just put a performer on it?just looking for idle to 5000 power range. no other mods yet, 701 voodoo cam and headers r in the wings
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the factory 360 and the factory 340 manifold arent gonna gain you much by swapping them. The performer will gain you more but not a ton. its better than stock for sure though. My advice, as it saves you time and money, wait to swap the intake until you get your cam and headers and new carb, then do it all at once, matching your cam profile to your headers, carb and intake to maximize your gains.
 
rigger3006 said:
ive got 79 360, stock thermoquad on it, ive got a 72 340 intake, would there be any performance difference if i swap them, or should i just put a performer on it?just looking for idle to 5000 power range. no other mods yet, 701 voodoo cam and headers r in the wings
Click to expand...
this reminds me of those guys who want to put a k & n air filter on their engine. They add superficial geegaws chasing a mythical 5hp. Other than being made out of (heavy)cast iron, the factory TQ intake is a damn fine intake manifold. If you are determined to spend x dollars, then do it. But I'd spend your money more wisely, and get the most bang for your buck. A well chosen cam, and expect to budget for adjustable rockers and new pushrods, maybe a rear gear change will do wonders. Headers are good, but you get what you pay for. If you're only concerned about under 5k rpm, get some early 340 exhaust manifolds, then you don't have to deal with the downside of all headers.
 
I was going to say, I wouldn't pull/ swap the intake unless there was a reason to open the engine up, like a cam swap. or even leaky intake gaskets. But to do it just to swap intakes?.. nah.
 
rustycowll69 said:
this reminds me of those guys who want to put a k & n air filter on their engine. They add superficial geegaws chasing a mythical 5hp. Other than being made out of (heavy)cast iron, the factory TQ intake is a damn fine intake manifold. If you are determined to spend x dollars, then do it. But I'd spend your money more wisely, and get the most bang for your buck. A well chosen cam, and expect to budget for adjustable rockers and new pushrods, maybe a rear gear change will do wonders. Headers are good, but you get what you pay for. If you're only concerned about under 5k rpm, get some early 340 exhaust manifolds, then you don't have to deal with the downside of all headers.
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voodoo 701 cam will be going in,already have it, so i wont need adj rockers or new pushrods unless theyre bent.not too concerned about the myhical 5 hp thing, im just one of those guys that just cant leave things stock.,oh ya , its already got 410s
 
Unless You are a Serious Drag Racer, leave it as is, and switch out the 410s for 3.23s or 3.55s and enjoy it.
 
A regular "Performer" may be the same or a bit worse performance-wise. A Performer RPM would help. But the OEM intakes are pretty good. The earlier one is suppose to be better, but not enough to make it worthwhile in your application. (Stock class racers tend to look for small benefits when there is a legal choice between OEM castings.)
 
A stock TQ intake and a 650 DP Holley spreadbore will make enough power to put You in the high 12's, that's a fact.....I'm not familiar w/the cam, but I second dano's
query & would add that while a change in valvetrain(rockers, pushrods, etc.) may not be needed to run, checking pushrod length & rocker geometry will very possibly
net you significant improvements anyway. FWIW, the Eddy Performer RPM cam states it requires adj. valvetrain............and that's how I ended up with one cheap, it
was installed and ran poorly as well as noisily w/stk. valvetrain components................................
 
The performer will perform worse then the factory 360 manifold or 340 manifold. Most likely your 360 manifold has egr. Swapping to the 340 manifold will get rid of it. The main benefit of the performer is weight. I have run my race car with a 340 and stock 340 manifold to 12.01.

Consider a Performer RPM or air gap. They out perform both the stock intake and standard performer. They make power down low like the stock manifold and carry it to high rpm like a single plane. I run a standard RPM now that I bought at a swap meet for 100.
 
If I had the later one on and the early one layin around, I'd change it. If nothing more than to clean up the look by getting rid of the EGR location. Not like it's a hard job.
 
thanks rusty, kind of what i was thinking,i prefer the clean look, get rid of the egr and air injection.i will also put in valve springs to match the cam. this engine isnt in my duster or demon, its in a79 18 ft. motorhome i just picked up, i trust this site for the experience and input from other members here
 
rigger3006 said:
thanks rusty, kind of what i was thinking,i prefer the clean look, get rid of the egr and air injection.i will also put in valve springs to match the cam. this engine isnt in my duster or demon, its in a79 18 ft. motorhome i just picked up, i trust this site for the experience and input from other members here
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Well that clears things up a bit, lol, honestly stock springs would be fine for most any RV oriented cams. But I wouldn't discourage a new set just the same, cheap insurance.
What type of headers? Man, that could kick out a ton of heat right under You in an RV, coated....wrapped?
 
rigger3006 said:
ive got 79 360, stock thermoquad on it, ive got a 72 340 intake, would there be any performance difference if i swap them, or should i just put a performer on it?just looking for idle to 5000 power range. no other mods yet, 701 voodoo cam and headers r in the wings
Click to expand...

rigger3006 said:
thanks rusty, kind of what i was thinking,i prefer the clean look, get rid of the egr and air injection.i will also put in valve springs to match the cam. this engine isnt in my duster or demon, its in a79 18 ft. motorhome i just picked up, i trust this site for the experience and input from other members here
Click to expand...
Leave the EGR intake on and unplug the EGR valve, cap it on the carb. Presto, EGR disabled and no longer is of any concern.
Use the '72 on something else cool.
Use the Performer as a door stop unless dropping 25lbs. off the nose of the car is important to you. Otherwise it is a waste of time.
 
Here's the real difference for that motor -The gaskets for the Performer are like $30 bucks cdn + plus the $20 cdn tube of "The Right Stuff" for the china rails .Noticeable performance upgrade = 0. Basically a $50 masturbatory exercise !
 
cannucky said:
Here's the real difference for that motor -The gaskets for the Performer are like $30 bucks cdn + plus the $20 cdn tube of "The Right Stuff" for the china rails .Noticeable performance upgrade = 0. Basically a $50 masturbatory exercise !
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Lol, possibly, but if the heat crossovers are packed full of carbon including the exhaust ports in the head then it was time & $50 well spent unless running a cold intake,
jetting for such, not worrying about starts below 45deg, not using an OE choke,.....................since the LA has a prodigious history of such an affliction...............
 
Lol!! Exactly what in the true above statement warrants disagreement? Been doin' this for a livin' for 33yrs. now, and back when mid-70's thru mid-80's teeners were
being driven every day all year, this was a very common issue. Customer states sluggish accel, idle won't or is slow to come down, guess why? Granted 95% of those
were catalyst equipped, which may have contributed to the tendency, & it's unlikely the OP's RV has a cat.......but just the same..............
 
OP
Do you realize that the Voodoo 701 has nearly identical advertised duration specs to the stock 360 2bbl cam? And the .050s may be only 4 or 5 degrees better for high performance.
And do you also realize that those 4 or 5 degrees of duration will steal a bit of already low, low-rpm performance?
Can you afford that in your 18footer?
 
Killer6 said:
Lol!! Exactly what in the true above statement warrants disagreement? Been doin' this for a livin' for 33yrs. now, and back when mid-70's thru mid-80's teeners were
being driven every day all year, this was a very common issue. Customer states sluggish accel, idle won't or is slow to come down, guess why? Granted 95% of those
were catalyst equipped, which may have contributed to the tendency, & it's unlikely the OP's RV has a cat.......but just the same..............
Click to expand...
LMAO! I read your reply, went back read the "disagree/dislike reply, said to myself who the hell ?!?! Clicked on list and it was me! Oh my gawd!
LMAO!!!
Must have slipped the finger over it on the I-phone! He he he he ha ha ha....

Those EGR ports in the head in the intake clog up very quickly! Even faster when the car is running wrong. Still, the stock on your intake is very good. I would not swap out the iron four barrel for the performer. There is no gain. Only lost 50 pounds, not really a big deal.
 
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AJ/FormS said:
OP
Do you realize that the Voodoo 701 has nearly identical advertised duration specs to the stock 360 2bbl cam? And the .050s may be only 4 or 5 degrees better for high performance.
And do you also realize that those 4 or 5 degrees of duration will steal a bit of already low, low-rpm performance?
Can you afford that in your 18footer?
Click to expand...
Splitting hairs again all we?
 
I honestly wouldn't bother with a performer intake. I'd go right to the RPM intake on nearly all applications. If you are going to use the factory car, I'd stock with the factory intake as said above.
 
no cat, 2 into 1 old log muffler, will go true duals, egr is blocked off by po ive discovered. im sure it needs a new timing chain so while im there i may as well throw in the 701 i have on the shelf. hmmmm ive got a set of 302s i could throw on to up the compression and gain a bit of torque
 
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