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Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2734824
01/20/20 10:59 AM
01/20/20 10:59 AM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
"Butt Crack Bob"
moparx  Offline
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north of coder
him's still HeRe.
got gOoD days and bAd days.............. laugh2
beer

Re: sp2p intake for 440 motor home [Re: moparx] #2735234
01/21/20 11:44 AM
01/21/20 11:44 AM
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Posts: 14,478
So. Burlington, Vt.
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fast68plymouth Offline
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I hope the OP tries it and reports back up


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: sp2p intake for 440 motor home [Re: fast68plymouth] #2735242
01/21/20 12:02 PM
01/21/20 12:02 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
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A little off topic but related. I've wondered how fuel injection would work on one of these older motor homes. I know where a pretty good looking Travco is.

Re: sp2p intake for 440 motor home [Re: justinp61] #2735338
01/21/20 04:51 PM
01/21/20 04:51 PM
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Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
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Originally Posted by justinp61
A little off topic but related. I've wondered how fuel injection would work on one of these older motor homes. I know where a pretty good looking Travco is.


I don't think it would be a worthwhile gain. EFI is great for cold-starts, warm-ups, short trips and town driving. In a motorhome where you fire it up and drive for hours fully up to temperature, well this is the type of driving a carb is at it's best. Sure EFI would be better, but I don't think better enough to justify the expense.

Re: sp2p intake for 440 motor home [Re: DaytonaTurbo] #2735381
01/21/20 07:14 PM
01/21/20 07:14 PM
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Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
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THINK the Plastic Fantastic ! ... with a 02 read out gauge and a simple water injection system you can tweak it to pretty good MPG !

Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2736001
01/24/20 02:07 AM
01/24/20 02:07 AM
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Castlegar, BC, Canada
That AMC Guy Offline
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When I bought my AMC Javelin, it had an SP2P and an Edelbrock 600 on top of the 360. The car ran a best of 15.1 to 14.9 in the quarter at Spokane Raceway. I later switched to a Performer and a Holley 600 (and ok, swapped to 3.15 gears from the 2.87) and picked up almost a full second in the quarter plus gained the ability to bark second gear. I used to have a timeslip in my wallet for my best run of 14.2 @ 99 mph, but it faded away.

(Yes, I realize that's slow. But the car was just my basic daily driver street car.)

SP2P's work better on 318's, Ford 302's, and Chevy 305/307's. Big cubic-inch engines are strangled by them. I'm not kidding! The ports are literally the diameter of a dime! When I swapped from SP2P to Performer, I was shocked at how tiny the ports were on the SP2P.

Last edited by RamblerMan; 01/24/20 02:07 AM.

Bloody Mary, Full of Vodka, Blessed art thou among cocktails....

Re: sp2p intake for 440 motor home [Re: That AMC Guy] #2736516
01/25/20 02:46 PM
01/25/20 02:46 PM
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Posts: 1,235
Phoenix, AZ
Jjs72D Offline
Deep in the closet
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Phoenix, AZ
Yeah, you could plug them with a marble.

Re: sp2p intake for 440 motor home [Re: Jjs72D] #2736520
01/25/20 02:57 PM
01/25/20 02:57 PM
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Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
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Florida STAYcation
Originally Posted by Jjs72D
Yeah, you could plug them with a marble.


The intake ports that are up against the cylinder head ?

I’ve seen A LOT of diff models of the SP2P intakes ... and that’s not my observation at all.

Re: sp2p intake for 440 motor home [Re: That AMC Guy] #2736523
01/25/20 03:09 PM
01/25/20 03:09 PM
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Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
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Originally Posted by RamblerMan
When I bought my AMC Javelin, it had an SP2P and an Edelbrock 600 on top of the 360. The car ran a best of 15.1 to 14.9 in the quarter at Spokane Raceway. I later switched to a Performer and a Holley 600 (and ok, swapped to 3.15 gears from the 2.87) and picked up almost a full second in the quarter plus gained the ability to bark second gear. I used to have a timeslip in my wallet for my best run of 14.2 @ 99 mph, but it faded away.

(Yes, I realize that's slow. But the car was just my basic daily driver street car.)

SP2P's work better on 318's, Ford 302's, and Chevy 305/307's. Big cubic-inch engines are strangled by them. I'm not kidding! The ports are literally the diameter of a dime! When I swapped from SP2P to Performer, I was shocked at how tiny the ports were on the SP2P.


RamMan ... I’m surprised the SP2P did as well as it did ! It is in no way a HIGH PERFORMANCE intake manifold.

What it’s for is low rpm GRUNT throttle response and better MPG..... and the carb should be tweaked over stick

I’ve even SEEN people making flaming mistakes with the SP2P .... like blocking the heat crossover!

Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2736557
01/25/20 04:40 PM
01/25/20 04:40 PM
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Posts: 3,122
Auburn WA
Dave_J Offline
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On the 440 Sp2P we sat it down next to a 1968 383 2bb Iron boat anchor. the ports were about the same on both the carb and head ends. So yes a Marble may block it but its a big marble.

Understanding on a 440 a 383 2bbl port is NOT a race port but its not that bad if you KNOW you will not be drag racing your 32 foot long Winnabago. Will it pull past 4500 RPM, YES but it will be lazy.


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: sp2p intake for 440 motor home [Re: Dave_J] #2736791
01/26/20 02:22 PM
01/26/20 02:22 PM
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Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
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Originally Posted by Dave_J
On the 440 Sp2P we sat it down next to a 1968 383 2bb Iron boat anchor. the ports were about the same on both the carb and head ends. So yes a Marble may block it but its a big marble.

Understanding on a 440 a 383 2bbl port is NOT a race port but its not that bad if you KNOW you will not be drag racing your 32 foot long Winnabago. Will it pull past 4500 RPM, YES but it will be lazy.


The head side of a 383 2 bbl intake port is the same as a SP2P 440 ?

I haven’t seen that type boat anchor in a loooong time but I sure don’t remember that

Re: sp2p intake for 440 motor home [Re: mgoblue9798] #2736890
01/26/20 08:32 PM
01/26/20 08:32 PM
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Posts: 1,629
wilmington,ohio
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ohiodemon Offline
top fuel
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wilmington,ohio
that intake needs to be thrown as far from your motor as possible.

Re: sp2p intake for 440 motor home [Re: ohiodemon] #2736912
01/26/20 09:42 PM
01/26/20 09:42 PM
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Florida STAYcation
dIc dOc Deity ! Offline
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Originally Posted by ohiodemon
that intake needs to be thrown as far from your motor as possible.


Well od ... TOSS IT right here .... these intakes worked GREAT on big boats like big Chrysler wagons and Imperials tooooo !

Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2736958
01/27/20 01:47 AM
01/27/20 01:47 AM
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Posts: 3,122
Auburn WA
Dave_J Offline
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Auburn WA
Doc, last time I seen that SP2P 440 was about 18 years ago. He had the Iron 440 4bbl next to the Iron 383 2bbl next to the SP2P 440. Yes it was smaller than the Iron 440 one.
I know it was bigger than the ports on my SP2P 318 that we had on a 1965 Dart GT 273 (with ported 66 273 heads).

Just because it had SP2P on it, not all of them had 260Ford-265Chevy-273Mopar size ports.... That would be stupid.

Guess the OP just needs to put a Tunnel ram with two Domanators on his Motorhome. whistling


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2737908
01/29/20 10:39 PM
01/29/20 10:39 PM
Joined: Mar 2010
Posts: 1,060
Atlanta, GA
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mgoblue9798 Offline OP
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Sorry to post and run had some stuff come up. Anyways, 32ft Travco, 32" tall tire, 4.56 gear, 518 trans, 440 with KB184 pistons, 452 heads set up properly for .040 quench, cast iron manifolds, and a thermoquad for starters.

RPM calculator in overdrive shows 60mph at 2000 rpm, 70 at 2300. With 400 plus ft lbs of torque from 2000 to 4000 I don't know why I would ever spin it higher than 4k.

Idea behind the intake is if it will increase fuel mileage from 7.5 to 8mpg that equates to about a 6.6% savings in gas. Hoping I can do even better than .5 mile per gallon improvement with the step pistons and quench.

Re: sp2p intake for 440 motor home [Re: fast68plymouth] #2737909
01/29/20 10:43 PM
01/29/20 10:43 PM
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Atlanta, GA
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mgoblue9798 Offline OP
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Atlanta, GA
I have considered a holley sniper only because it would adjust for altitude while traveling out west.

Re: sp2p intake for 440 motor home [Re: mgoblue9798] #2737965
01/30/20 03:27 AM
01/30/20 03:27 AM
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Posts: 3,122
Auburn WA
Dave_J Offline
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Auburn WA
And,..... Whats your 60 foot time? wink

Someone said, way up in the posts, to try it and see. Whats it take to swap a manifold on the 440? Drain the coolent, undo the bolts pull the iron anchor off and with some new chinawall seals and a squirt of RTV and 'Bob's your uncle'.

I think the Thermoquad will bolt on to the SP2P. And if it restricts air flow, the Thremoquad will still only flow what the engine can pull.


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: sp2p intake for 440 motor home [Re: Dave_J] #2738045
01/30/20 11:54 AM
01/30/20 11:54 AM
Joined: Jan 2003
Posts: 14,478
So. Burlington, Vt.
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fast68plymouth Offline
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So. Burlington, Vt.
No need to drain the coolant for an intake swap on a 440.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: sp2p intake for 440 motor home [Re: mgoblue9798] #2738168
01/30/20 06:05 PM
01/30/20 06:05 PM
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Posts: 30,247
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
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Originally Posted by mgoblue9798
Sorry to post and run had some stuff come up. Anyways, 32ft Travco, 32" tall tire, 4.56 gear, 518 trans, 440 with KB184 pistons, 452 heads set up properly for .040 quench, cast iron manifolds, and a thermoquad for starters.

RPM calculator in overdrive shows 60mph at 2000 rpm, 70 at 2300. With 400 plus ft lbs of torque from 2000 to 4000 I don't know why I would ever spin it higher than 4k.

Idea behind the intake is if it will increase fuel mileage from 7.5 to 8mpg that equates to about a 6.6% savings in gas. Hoping I can do even better than .5 mile per gallon improvement with the step pistons and quench.


Wow mGo ! ... is this combo all done ? ... or jsta planned ?

Your 8 mpg goal ? ... you should be able to get that with a pig fat Berri crab !!

What will your driving habits be ? Keeping up with traffic or a easy cruise in the far right lane with the cruise control clicked at 60 or so mph ?

Re: sp2p intake for 440 motor home [Re: dIc dOc Deity !] #2738413
01/31/20 01:28 PM
01/31/20 01:28 PM
Joined: Mar 2010
Posts: 1,060
Atlanta, GA
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mgoblue9798 Offline OP
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Just planning stages now. Starting to gather parts hence the question about the intake. I have the 440, 518, and adapter already and will start building them shortly.My wife has a couple years left before she retires and we start traveling. I will be pulling a double decker trailer with my challenger and a small boat on it so 65mph probably as fast as I would care to drive in the wide open spaces.

Last edited by mgoblue9798; 01/31/20 02:14 PM.
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