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#67107 - 06/03/08 09:58 PM Edelbrock Performer, LD4B, & SP2P-318 differance?
ragtop Offline
pro stock

Registered: 01/22/03
Posts: 1285
Loc: MA
All three have the smaller 273-318 port size, so what are the differances in fuel economy between all three? Thanks.

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#67108 - 06/04/08 12:01 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: ragtop]
340SHORTY Offline


Registered: 08/20/03
Posts: 12291
Loc: Kent, Wa
the performer and the LD4B are basicly the same... the SP2P was a poor attempt at a 4 barrel man for emissions. use the LD4B pr Perf...
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#67109 - 06/04/08 12:06 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: 340SHORTY]
RobX4406 Offline
I Live Here

Registered: 04/19/05
Posts: 12271
Loc: Overpriced Housing Central
LD4B is the best manifold of the three for performance. It's the 318 copy of an LD340.

Performer is similar to a stock 318 manifold except lighter.

SP2P is a motorhome intake and suitable for smelting if you plan on using it for a performance build. It wouldn't even be good for ballast even if in a small brick.. too light.

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#67110 - 06/04/08 05:00 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: 340SHORTY]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
Quote:

the performer and the LD4B are basicly the same...


Wrong!!! There is a vast performance difference between the Performer and the LD4B intakes. Noooo comparison.

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#67111 - 06/04/08 06:40 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparforLife]
mark7171 Offline
pro stock

Registered: 04/08/07
Posts: 1261
Loc: ILL
the streetmaster 318 is fair manifold. sp that pulls? to 5500rpm

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#67112 - 06/04/08 06:51 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparforLife]
UCUDANT Offline
Troll Hunter

Registered: 01/20/03
Posts: 6820
Loc: New Mexico
Quote:

Quote:

the performer and the LD4B are basicly the same...


Wrong!!! There is a vast performance difference between the Performer and the LD4B intakes. Noooo comparison.






LD4b is most like the LD340 which is still one of the best intakes for the small block BTW.

A performer is more like the stock 340 intake only in aluminum

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#67113 - 06/04/08 07:18 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: UCUDANT]
mark7171 Offline
pro stock

Registered: 04/08/07
Posts: 1261
Loc: ILL
wrong...different plenum volume. different runners.

you will see a gain over the stock manifold with a performer.

the ld340 is a good intake.


Edited by mark7171 (06/04/08 07:19 AM)

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#67114 - 06/04/08 07:53 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: mark7171]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
Quote:


you will see a gain over the stock manifold with a performer.




May be i s some aplications but for the most part will give very little over the OEM cast iron intake other than a huge weight savings.

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#67115 - 06/04/08 08:25 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparforLife]
mark7171 Offline
pro stock

Registered: 04/08/07
Posts: 1261
Loc: ILL
i disagree, there is too much volumetric difference from the OEM.

is the LD340 considered OEM ? performance factory intakes are good. designed when you didnt need to spin things so fast.


also, it is easy to hit the performance barrier the small 318 heads create.

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#67116 - 06/04/08 08:56 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: mark7171]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
Looks good on paper but in the real world it has been proven again and again that they are little or no better than the cast intake in most cases. They work well as a cheap up grade to a 4 barrel for like we used to do on a lot of 318 trucks back in the 70's. Cheaper than the OEM manifolds and lighter. To each their own.

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#67117 - 06/04/08 10:52 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparforLife]
MoparJ Offline
super stock

Registered: 02/07/08
Posts: 865
Loc: Camarillo, California (SoCal)
With my stock headed 318, with near stock compression, headers, warm cam and 650 Holley, would my Performer be the better package or should I try to find a LD4B?

Dont mean to hijack, but I think it is valubable info to the topic at hand.
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#67118 - 06/04/08 11:11 AM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparJ]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
http://cgi.ebay.com/ebaymotors/_Car-Truc...0228040974&
No it isn't mine but it is what I would do. Going from a Performer to an LD4B was probably the least expensive kick in the but for the car at the time.

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#67119 - 06/04/08 12:41 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: MoparforLife]
stwheels Offline
super gas

Registered: 02/13/03
Posts: 1945
Loc: Edmonton , Alberta , Canada
I just installed an LD4B on my 318 (302 casting heads with a mild port job and headers) along with an Edelbrock 600 cfm performer carb and I love it! Lots of bottom end grunt and the gas mileage is pretty good too.

Last weekend I did a 600 mile road trip from Edmonton to Kindersly Sask. and back in the 67 Coronet with 3:55 gears and got between 17 and 19 mpg at speeds between 70 and 80 mph. The lower mileage was heading into a considerable headwind too! Lots of runs up to and over 100 mph along the way so I'm sure I could have gotten much better mileage with a lighter foot but wheres the fun in that???

If you ever want to open the throttle for miles on end then take a trip to Saskatchewan ... LOL

I'll start a new thread with the pictures I took along the way, we had an awesome day and I want to do it again several times this summer.

I got my intake from Tony at Tonys Parts (Moparts sponsor) for $100 US and I believe he still had another one in stock.


Attachments
4467392-LD4B&carb.jpg (145 downloads)

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#67120 - 06/04/08 12:49 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: mark7171]
RobX4406 Offline
I Live Here

Registered: 04/19/05
Posts: 12271
Loc: Overpriced Housing Central
Quote:

wrong...different plenum volume. different runners.

you will see a gain over the stock manifold with a performer.

the ld340 is a good intake.




In reference to replacing a stock 340 manifold with a Performer, that's a step backwards. The only benefit a performer has is weight reduction. Performer is a manifold designed for the 318 and smaller late model 360 runners. It's called a Performer 318/360 for a reason. The stock cast iron 340 square bore AVS or TQ manifolds are superior to a performer.

A Performer RPM or Air Gap is a whole different animal. Similar to an LD340 in characteristics.

Some LD340's have a Chrysler number cast in it, so an over the counter OEM maybe... The LD340 is one of the best manifolds ever for a SB mopar.

The OP asked about fuel economy. The performer or sp2p is a better choice in keeping velocity up than a LD4B.

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#67121 - 06/04/08 03:06 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: RobX4406]
mark7171 Offline
pro stock

Registered: 04/08/07
Posts: 1261
Loc: ILL
the RPM is definitely different , very large volume and runner lenth. that one is closer to the LD340 in volume. the LD4b is a large port intake too....

the edelbrock performer is a great manifold to build power from idle to 5500. it has different plenum volume. also narrower runners than the ld4b to increase velocity.

i have not had a chance to try a ld4b . the performer, rpm, and streetmaster single i have tried on my 318.

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#67122 - 06/04/08 04:16 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: mark7171]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
Alright here we go again: My 360 is alot of off teh back shelf used parts but it started out with a used Performer when I built it. It was there on hand and the price was right. After running like this a year of so I came across a used LD4B and made a swap. can't remember off hand the numbers but it was almost unbeleivable to me for such a simple thing. Used this 3 or 4 years and then tried a friends LD340. There was a slight increase but not near what there was going from the Performer to the LD4B OR what you would expect from such a port difference in sizing. Like I said there was some what of an increase but it was minimal.
The LD4B plenum height, and size and the runner size is all very close to the LD340 till the ports get down to where they meet the heads. The runners are also reversed.

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#67123 - 06/04/08 07:29 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: RobX4406]
ragtop Offline
pro stock

Registered: 01/22/03
Posts: 1285
Loc: MA
The OP asked about fuel economy. The performer or sp2p is a better choice in keeping velocity up than a LD4B.




Thanks. I will try to ask again. I have a sm. primary Thermoquad that I want to put on my 318.
What intake will give me the best gas mileage? Thanks.

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#67124 - 06/04/08 07:47 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: ragtop]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25169
Loc: Upper Midwest
Sorry overlooked that. Most people that I know that build and/or modify an engine for a hotrod put fuel mileage on the back burner. Even with the high fuel prices.
_________________________
Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

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#67125 - 06/04/08 08:18 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: mark7171]
UCUDANT Offline
Troll Hunter

Registered: 01/20/03
Posts: 6820
Loc: New Mexico
Quote:

wrong...different plenum volume. different runners.

you will see a gain over the stock manifold with a performer.

the ld340 is a good intake.




Wrong? Where did I say the plenums were the same? I said as compared to certain manifolds it was more like a stock unit.




Heres bit of info from a July? 2001 pg 83 INDUCTION EXTRAVAGANZA article in Mopar Muscle
They used a fresh 360 street mill 10:1 compression mildly ported edelbrock heads Comp cams custom grind cam (7131/7132 on a 108 plus 4.) 272/276 .558/.564 1.6:1 rockers

Edelbrock Performer no 2176
rated idle -5500rpm
Max hp: 451.2 @ 6,000rpm
Max Torque: 452.0 @4100
Average hp 3,000-6300rpm: 375.9hp
av torque: 426.7 lb-ft

Edelbrock Perf RPM AirGap no7576
rated 1500-6500plus
Max hp: 475.4 @ 6,200rpm
Max Torque: 469.8.0 @4100
Average hp 3,100-6200rpm: 391.6hp
av torque: 443.7 lb-ft

Edelbrock Torker II no.5076
rated 2500-6500
Max hp: 476.5 @ 6,300rpm
Max Torque: 457.7 @4800
Average hp 3,100-6200rpm: 387.2hp
av torque: 437.0 lb-ft

Holley strip Dominator
rated: 4500-8,500
Max hp: 476.5 @ 6,300rpm
Max Torque: 457.4 @4500
Average hp 3,100-6200rpm: 385.5hp
av torque 435.2 lb-ft

Mopar Performance 6 pack P4529054
rated: 2500-6,500
Max hp: 464.1 @ 5,900rpm
Max Torque: 455.4 @3,900
Average hp 3,100-6200rpm: 381.2hp
av torque 431.4 lb-ft

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#67126 - 06/05/08 02:39 PM Re: Edelbrock Performer, LD4B, & SP2P-318 differance? [Re: UCUDANT]
ragtop Offline
pro stock

Registered: 01/22/03
Posts: 1285
Loc: MA
Quote:



Heres bit of info from a July? 2001 pg 83 INDUCTION EXTRAVAGANZA article in Mopar Muscle
They used a fresh 360 street mill 10:1 compression mildly ported edelbrock heads Comp cams custom grind cam (7131/7132 on a 108 plus 4.) 272/276 .558/.564 1.6:1 rockers

Edelbrock Performer no 2176
rated idle -5500rpm
Max hp: 451.2 @ 6,000rpm
Max Torque: 452.0 @4100
Average hp 3,000-6300rpm: 375.9hp
av torque: 426.7 lb-ft

Edelbrock Perf RPM AirGap no7576
rated 1500-6500plus
Max hp: 475.4 @ 6,200rpm
Max Torque: 469.8.0 @4100
Average hp 3,100-6200rpm: 391.6hp
av torque: 443.7 lb-ft

Edelbrock Torker II no.5076
rated 2500-6500
Max hp: 476.5 @ 6,300rpm
Max Torque: 457.7 @4800
Average hp 3,100-6200rpm: 387.2hp
av torque: 437.0 lb-ft

Holley strip Dominator
rated: 4500-8,500
Max hp: 476.5 @ 6,300rpm
Max Torque: 457.4 @4500
Average hp 3,100-6200rpm: 385.5hp
av torque 435.2 lb-ft

Mopar Performance 6 pack P4529054
rated: 2500-6,500
Max hp: 464.1 @ 5,900rpm
Max Torque: 455.4 @3,900
Average hp 3,100-6200rpm: 381.2hp
av torque 431.4 lb-ft




Great info. If you were to quess, how would the LD340 compare to the Air Gap & the Six Pack manifold for approx HP & torque numbers?

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