Sp2p vs performer intake for small block?
#2648311
04/23/19 11:05 PM
04/23/19 11:05 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
OP
top fuel
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OP
top fuel
Joined: Jan 2010
Posts: 1,944
woodcrest, CA
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I have a 1968 d200 with a 1970 318. It currently has the sp2p on it.
20 years ago, when it was put on, it was discovered that it had a crack that caused an oil leak (what I was told from the previous owner) and was fixed via epoxy. I have not seen nor investigated past that statement. He is a good friend of mine, so I’ll take his word.
The motor has 30k miles on a rebuild, but it is a grease ball. It was driven the 30k miles, then parked because the owner (my friends nephew) passed away from cancer. Maybe 5 years on that rebuild...
So I assume that the intake has been leaking the whole time it was driven.
I have a performer intake that I “could” borrow from a spare motor.
Between the 2 intakes, which one is more favorable? I’m not going all out power, just a nice cruiser, and Home Depot duty. I would like more fuel mileage if anything. I’ll be running a 600 cfm carb on either intake.
So... fix sp2p or swap performer?
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Re: Sp2p vs performer intake for small block?
[Re: Kern Dog]
#2648322
04/23/19 11:59 PM
04/23/19 11:59 PM
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Joined: Jan 2003
Posts: 16,840 Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,840
Between Houston & Galveston TX
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The SP2P is strictly for mileage. As franky said, the ports are REALLY small. Pinch off your nose, cover your mouth, and RUN. That's basically what an SP2P does to your engine.
John
The dream is dead, long live the dream.......😥
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Re: Sp2p vs performer intake for small block?
[Re: 340SIX]
#2648382
04/24/19 09:39 AM
04/24/19 09:39 AM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
master
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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The performer has 318 sized ports and is ideal for that engine. If you had a 340 or 360 you would probably want to gasket match and blend a bit but it will bolt on and work fine as-is. The performer is also one of the few aftermarket intakes that will allow you to bolt up a factory AC compressor in the stock location.
Last edited by Montclaire; 04/24/19 09:42 AM.
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Re: Sp2p vs performer intake for small block?
[Re: Montclaire]
#2648389
04/24/19 09:46 AM
04/24/19 09:46 AM
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Joined: Jan 2003
Posts: 28,611 Shopping @ HoBo Fright
340SIX
Doc Flappergas's Evil Twin
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Doc Flappergas's Evil Twin
Joined: Jan 2003
Posts: 28,611
Shopping @ HoBo Fright
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The performer has 318 sized ports and is ideal for that engine. If you had a 340 or 360 you would probably want to gasket match and blend a bit but it will bolt on and work fine as-is. The performer is also one of the few aftermarket intakes that will allow you to bolt up a factory AC compressor in the stock location. That is 100 percent why I used one on my old 340. A/C and easy to port is was almost like the 340 one night wise etc. Was a better to choosecthag than others.
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Re: Sp2p vs performer intake for small block?
[Re: 340SIX]
#2648391
04/24/19 09:52 AM
04/24/19 09:52 AM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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That is 100 percent why I used one on my old 340. A/C and easy to port is was almost like the 340 one night wise etc. Was a better to choosecthag than others.
Other than a few extra pounds, the factory 340 intake is within 15 hp or so of the performer, basically apples to apples. If you have the cast iron don't be afraid to run it.
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Re: Sp2p vs performer intake for small block?
[Re: Montclaire]
#2648398
04/24/19 10:07 AM
04/24/19 10:07 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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Boom!!!! There it is. Truer words have never been said. I’d run a stock 2bbl intake and carb before I put on one of those. And their “greatness” isn’t limited to SB mopars either. They suck on everything. Friend of mine has a 68 Camaro ss 396. One of the local 396 gurus gave him a recipe for a 400hp hot street build. 9.5cr, comp 280h magnum cam, Ede 750 carb..... sp2p...... no headers. He wasn’t to impressed with it, and after taking it for a test ride I could see why. It was absolutely “done”(and wheezing) at 4500. It really didn’t do anything particularly well. No great throttle response....... it was just a straight up dud. I tried a Holley on it, which ran better, but didn’t feel like it made any more power. It did make the motor behave in a way I’ve never experienced before or since. After about 3500rpm or so, when you rolled the throttle open, you could feel it lose power....... instantly. Like more throttle opening was messing with what was going on under the carb. Once he commited to making some changes, he pulled it out and I dynoed it, just as it was in the car, ex manifolds and all. It made an earth shattering 283hp. Yeh....... that’s pretty close to 400, right? Headers picked it up about 30hp, Changed to a small solid cam, rpm a/g, Demon 650dp........ made another 100hp and pulled strong to 6500. For a mild street sb Mopar, I like the std performer......on 273’s thru 360’s.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Sp2p vs performer intake for small block?
[Re: fast68plymouth]
#2648401
04/24/19 10:28 AM
04/24/19 10:28 AM
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Joined: Jan 2003
Posts: 16,840 Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,840
Between Houston & Galveston TX
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fast68plymouth, based on your story, you and your friend don't have a clue what the SP2P was designed for.
Newsflash, not every after market intake was designed for drag racing, re: high RPM.
The SP2P was made during the gas crisis, when everyone was trying to squeeze out every last MPG from their engine.
It was designed for low to mid range, NOT high RPM, so, it falling on it's face over 5,000 RPM is expected.
Last edited by Satilite73; 04/24/19 11:20 AM. Reason: re-worded a sentence.
John
The dream is dead, long live the dream.......😥
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Re: Sp2p vs performer intake for small block?
[Re: SattyNoCar]
#2648406
04/24/19 10:36 AM
04/24/19 10:36 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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Yup......... I’m clueless.
My impression as to the reason behind the OP’s post is that he’s wondering if one of the two manifolds he has on hand offers a performance advantage over the other. If he really didn’t care about the performance, he would simply put the sp2p back on without giving it another thought.
My story was an illustration as to how much of a detriment to “performance” the sp2p can be.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Sp2p vs performer intake for small block?
[Re: magnum440d100]
#2648545
04/24/19 04:44 PM
04/24/19 04:44 PM
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Joined: Jan 2003
Posts: 8,681 Buford, GA
I_bleed_MOPAR
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master
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Buford, GA
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Well, alright guys! You guys have me convinced. I’m going to yank the motor to degrease and replace the rear freeze plugs, then I will replace the manifold with the performer Good choice. I also made the mistake of running an Sp2p on a 318 but at least it was given to me. I honestly think the car ran better with the stock intake and carb. Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: Sp2p vs performer intake for small block?
[Re: Kern Dog]
#2648747
04/25/19 10:14 AM
04/25/19 10:14 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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I Live Here
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It felt as if it got slower the further I pressed the accelerator. That’s exactly how that 396bbc felt with the sp2p on it. After about 3000-3500 rpm, pushing on the gas pedal felt like pushing on the brakes. As with most things........ if you do some digging around on the net you can find people relaying their sp2p experiences, you’ll find some good and some bad. Most I saw were negative....... but there were a few who had favorable things to say. One I saw that stood out(probably because it had a pro and a con) was....... the car picked up 2mpg........ but was gutless.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Sp2p vs performer intake for small block?
[Re: Kern Dog]
#2648885
04/25/19 02:38 PM
04/25/19 02:38 PM
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Joined: Jan 2003
Posts: 8,681 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,681
Buford, GA
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'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: Sp2p vs performer intake for small block?
[Re: fast68plymouth]
#2648886
04/25/19 02:41 PM
04/25/19 02:41 PM
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Joined: Jan 2005
Posts: 12,423 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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The TQ peak of the SP2P is at such a low RPM no TQ converter will stall that low, maybe if you had a crawler that you wanted to idle at 400RPM with a manual trans and never turned over 3500RPM it may be good for that, besides that I can think of no other use.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Sp2p vs performer intake for small block?
[Re: HotRodDave]
#2648944
04/25/19 05:14 PM
04/25/19 05:14 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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After driving my friends Camaro with one on it, I came away with the idea that it’s not even intended to be used at WOT. It’s like the design requires there to be a high amount of vacuum in the plenum(as in throttle blades mostly closed) for it to function “properly”.
In his car, the overall driving experience was poor. There was nothing about how the motor ran that stood out at all....... other than how weak it felt when you stepped on the gas. One would have expected fantastic throttle response with those tiny runners....... but it was not the case with that 396. It definitely made the top 10 list of worst overall combos I’ve driven.
I would say a more realistic powerband for one of those is idle to around 2500, with light throttle openings.
Also, obviously since the runners are so tiny, the bigger the motor you put under it, the lower to usable operating range will be. Probably not totally awful on a 273........to very unsatisfying on a 360.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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