cwhubb
Well-Known Member
what's your general opinion on a one inch carb spacer and any performance gains on a stock mopar 4bbl intake? 440 .30 over, 10-5-1 pistons
carb spacers
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bigmanjbmopar
Newb with a view
If you have the clearance go for it. Doesn't hurt anything and does keep the carb cooler if you use the phenolic one I use the aluminum !/2" and the carb still gets a little hot.
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cool fuel
I've seen & read about gains on a dyno, of 12-15+hp & up-to around 18-20hp, on a 700+hp BB Mopar wedge built by Jim & Cody LaRoy a member here, IQ52 of LaRoy Engine from Challis Idaho, 451ci or bigger maybe, with ported cylinder heads & a 0.700"+ gross valve-lift roller camshaft... with the proper type size & style of spacer, on the proper engine combo, mostly always above 3500rpm thou, little gains, but still some gains, below that level "usually", it really depends on what type material & size, of head & intake manifold, type & size carburetor &/or size, shape, material & style of spacer used, open or ported or tapered etc., a cooler denser fuel charge is always better somewhere in the RPM range, the taller intake & farther the carburetor sits away from the intake valve, it gives a free falling & slight tunnel "ram" effect, adding velocity for better atomization & fuel mixture... If you have the clearance necessary, a phenolic spacer & an aluminum heat shield & insulated larger fuel lines, a bypass style fuel regulator to return un-needed fuel back to the tank & to help keep the fuel cool, are alway a good idea... An adequate supply of cool fuel, cool fuel lines, cool dense air & a cool carburetor, is always a good thing, on any performance engine...
I've seen & read about gains on a dyno, of 12-15+hp & up-to around 18-20hp, on a 700+hp BB Mopar wedge built by Jim & Cody LaRoy a member here, IQ52 of LaRoy Engine from Challis Idaho, 451ci or bigger maybe, with ported cylinder heads & a 0.700"+ gross valve-lift roller camshaft... with the proper type size & style of spacer, on the proper engine combo, mostly always above 3500rpm thou, little gains, but still some gains, below that level "usually", it really depends on what type material & size, of head & intake manifold, type & size carburetor &/or size, shape, material & style of spacer used, open or ported or tapered etc., a cooler denser fuel charge is always better somewhere in the RPM range, the taller intake & farther the carburetor sits away from the intake valve, it gives a free falling & slight tunnel "ram" effect, adding velocity for better atomization & fuel mixture... If you have the clearance necessary, a phenolic spacer & an aluminum heat shield & insulated larger fuel lines, a bypass style fuel regulator to return un-needed fuel back to the tank & to help keep the fuel cool, are alway a good idea... An adequate supply of cool fuel, cool fuel lines, cool dense air & a cool carburetor, is always a good thing, on any performance engine...
It would be an inexpensive start to you horsepower build-up. It has to start somewhere.
RustyRatRod
Well-Known Member
What Budnicks said. The bigger and badder your engine, the bigger and badder the gains. Generally, what happens is, a spacer moves the power band up in the RPM range. It also adds to the plenum volume which does help pick up HP and torque.
65 Plymouth Satellite 426
Well-Known Member
Definitely Helps The Gas Cooling Situation!
RustyRatRod
Well-Known Member
On the fuel cooling......it's really dependent on what the spacer is made of. If it's metal, the cooling isn't near as good as say wood or phenolic or plastic. In fact, metal spacers don't get it much cooler at all. Some of the high end insulator spacers are really expensive because they insulate like a big dawg. A lot of times, it doesn't hurt to run a heat shield AND a spacer. Keeping the fuel cool is one place where overkill does not hurt.
womanator
Well-Known Member
The original engine in the race car was built by Muscle Motors.<br>They had complete control over the build.<br>What I told them was I wanted a 9.70's engine based on a 400 block.<br>The intake they used was the Indy 4150 style with the spacer going to a 4500 carb.<br>They said this would speed up the air and give a better air fuel distribution.<br>With this conbo the car went a best of 9.599.<br>This was with a non roller cam.<br><br>
645 hp to the rear wheels.
645 hp to the rear wheels.
cwhubb
Well-Known Member
Thanks guys, basically I was looking for better atomization/velocity. I think the cooler fuel benefit is worth it alone. I want a new intake and am leaning towards the M1 single plane, the rpm performer looks great but i dont want to deal with clearance issues, the performer seems not worth the money as its pretty close to stock intake specs. I'n not worried about low end loss as my car has 4:10's, 1 3/4 headers, 25.7 inch tires, 234/234 crane fireball 290 cam, 750 holley, 3500 stall, manual shift auto tranny. the heads are stock but will be tweaked for velocity/Ve vs hogged out for total cfm's. the car takes off hard and pulls very strong all thru the power band, I've never taken it up to the point it starts backing off cause I lose my nerve lol
HT413
Semi Pro Bowler
This an oldish article but might be worth a read regarding intake selection. It's geen around long enough that you may have already read it...
http://www.hotrod.com/techarticles/hrdp_0712_mopar_intake_manifold_comparo/viewall.html
http://www.hotrod.com/techarticles/hrdp_0712_mopar_intake_manifold_comparo/viewall.html
cwhubb
Well-Known Member
ht413, I did read that article, I was surprised how most of the intakes were so close in performance, what does everyone think of the new torker?
RamNBee
Well-Known Member
Holley Street Dominator, no hood clearance issues and close if not better than M-1 in performance. I am going with M-1 because I like the way it looks.
Sonny Black
Well-Known Member
View attachment 003.jpgI have a carburetor insulator plate..IT works, and seems like more power?...a bit?
the 63 starts e-z 'er..the gas( if you want to call this reform' crap gas,) does not boil after driving.
Sonny
the 63 starts e-z 'er..the gas( if you want to call this reform' crap gas,) does not boil after driving.
Sonny
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when i changed from the edelbrock carb to the holley, i needed a one inch spacer for clearance reasons only. its a wood one...(pressed wood i think). im not sure if it was the carb or the spacer...but the throttle is alot more responsive....BUT...i have just enuff room to close the hood. i wasnt really after more horse power,,,just wanted that eddy off of there....but it does run better and starts alot easier for some reason .! the new Holley 850 sits on a stock 1967 440 intake manifold
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1" phenolic here. Don't know about hp, but it helps with heat soak in 105 temps and extended idling in Reno in August. Got away with it due to the power bulge hood even with the RPM intake.
383man
Well-Known Member
I also use a 1" phenloic spacer and a carb heat shield which is under the spacer since the heat shield is aluminum. We had a brutal hot & humid summer here in Md and the pump gas has more ethanal this year and when real hot some of us had fuel boiling trouble. I had the 1" spacer allready and added the heat shield which seemed to cure the small problem I had on a few brutal hot days. But without the phenolic spacer which I did not have on a few years back it would have some heat soak even on normal summer days and the spacer cured that big time. I also can not go any taller because of hood clearence. I never compared the performance difference with or without it. Ron
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